Date   

Re: strange electrical issue - anyone have any knowledge of what to do.

Roland Christen
 

Well, it could be any of your power supplies. As I said in my post, once you determine that isolating the mount from your laptop, you will have the first clue that it is a leakage current problem. That leakage current could be coming from any of your AC/DC power supplies. So your next step is to test the supplies with an AC voltmeter to ground. Find out which supply is creating an AC voltage on any of their DC output pins. Measure it to the AC ground pin.

Rolando



-----Original Message-----
From: Ron Kramer ronkramer1957@... [ap-gto]
To: ap-gto
Sent: Thu, Oct 19, 2017 1:16 pm
Subject: Re: [ap-gto] strange electrical issue - anyone have any knowledge of what to do.



But how to test it? My only test destorys laptops? 


Try running your CP4 off a 12 volt battery. That would confirm that something is flaky with your Dc power supplies.

Rolando

On Wed, Oct 18, 2017 at 3:24 PM, chris1011@... [ap-gto] <ap-gto@...> wrote:
 
Try running your CP4 off a 12 volt battery. That would confirm that something is flaky with your Dc power supplies.

Rolando



-----Original Message-----
From: Ron Kramer ronkramer1957@... [ap-gto] <ap-gto@...>
To: ap-gto <ap-gto@...>
Sent: Wed, Oct 18, 2017 2:13 pm
Subject: Re: [ap-gto] strange electrical issue - anyone have any knowledge of what to do.



I have gone to 3 prong with ground, that actually was in use with the 2nd laptop. (before it died).
Laptops don't display anything or even beep. They just come up with power light and fan.  That's all.

Battery on the first new laptop was fully charged and if power is disrupted, the battery takes over.  (like if I pull the AC or turn off the power strip, the laptop would stay running). 
What puzzles me is why they go blank when the 12v connector is applied into the cp4? 

no bios message or anything else (ACER splash screen is ever seen, just black).
I'm quite good with computers... I've never seen one power up with fan and nothing else.  I don't know if I can wait - I think I might have to move a extra desktop out there
but the 1.5 days of software install and configuration is getting old. 

I'm more concerned with why power drops when plugging in the CP4. 
NOTHING else shuts down.  

On Wed, Oct 18, 2017 at 11:03 AM, 'Joseph Zeglinski' J.Zeglinski@... [ap-gto] <ap-gto@...> wrote:
 
Ron,
 
    Could it be that you have flakey power from the AC outlet at the “gate”?
 
    Unexpected glitches could cause Windows to crash – without a formal shutdown. That might be corrupting your Windows boot partition. When you try to reboot, the laptop can’t find a proper boot record, so it stays black ... usually a text message says to insert a bootable device.
 
    I would suggest installing even an inexpensive small UPS in the dome, so that the unexpected power dropouts are carried through for upto 10 minutes. Some,  even small UPS (like from TrippLite), have a USB cable talking to Windows, and when it senses a switch over to its battery, it issues a formal Windows Hibernate or shutdown, when its battery nears being drained, or by your specified shutdown period.
 
    However, the battery in the laptop should have already handled this  – and the power option in Windows is normally set up to shut down Windows when its battery reaches 10%. Check your power option plan to confirm.  If for some reason, there is no grace percentage in your power plan, it would also crash Windows, possibly irrecoverably without user Win boot record repairs. So, this may still not account for your problem.
 
    Finally, very many, if not most telescope device electronics seem to be meant for battery operation, so the circuit board LOGIC ground wires are tied directly to Chassis (Earth) ground. Without that green ground wire, there is no place to dispel a short except the DC supply, via whatever other circuit boards traces “conveniently” share that common  Earth/Logic connection. Since you haven’t provided one in the power cable, everything else is at risk.
 
    I may be possibly overstating the latter case, but I wouldn’t chance not using at least a properly grounded power cord from the mains.
 
    In any case, you should have a UPS – fed by a proper 3-wire power cord, since UPS’s complain and probably won’t function without a safety Earth Ground connection to the main AC supply.
 
    Have you tried booting to laptop BIOS, to see if it is just a boot record damage or the laptop really is fried? The former can be fixed by yourself, with some time and effort. Worth investigating before returning more laptops for electronic repair. Possibly a software tech at the local PC store, can get the laptop booting again – quicker than shipping it to the manufacturer.
 
Good luck,
Joe







Re: strange electrical issue - anyone have any knowledge of what to do.

Ron Kramer
 

Get this?


Put my ethernet into and out of this to laptop?  But what about 12v?  do I plug my 4 AC/DC (cheap 20.00) convertors into these ports? 


On Wed, Oct 18, 2017 at 3:35 PM, 'Christopher Erickson' christopher.k.erickson@... [ap-gto] <ap-gto@...> wrote:
 

Speaking as an electrical engineer and journeyman electrician:
 
Spurious ground differentials.  Your mount power supply is the most likely culprit.
 
The communications ports on your laptops (USB, RS-232, HDMI, VGA, SDHC, etc.) are not protected in any way from spurious ground differentials and any other grounding problems that might exist in your mount power supply.  The CP4 has hardened ports so it will be the laptop that suffers.
 
You didn't mention what brand and model of dome you have.  Technical Innovations (home dome, pro dome) use horrible 12V power supplies with minimal/no filtration that can cause problems for any electronics mounted in them or on them.  Don't be tempted to run anything else from a TI dome power supply.  It will be a source of countless problems and damaged equipment.
 
Additionally, TI uses automotive windshield wiper motors to drive their domes.  The frame of those motors was designed to be grounded to the -12V side of a car's power system.  TI drives the windshield wiper motors bidirectionally, which is not how they were designed.  This means that when being driven in reverse, the frames of the motors are at +12V instead of -12V.  This can create a shorting hazard in the observatory, as well as being disruptive to electronics that could come in contact with those motors or anything conductive that those motors are attached to.
 
1. Have an electrician inspect your gate outlet to make sure you didn't swap the hot and neutral.
2. Make sure your extension from the gate outlet to the observatory is at least 12GA and not over 100'.
3. Make sure the insulation and protection on your power extension from the gate meets electrical code.
4. Ground everything in the observatory.  No more two-prong 120VAC power cords, power strips and stuff.
5. Get a modern, switching 2.5A 12VDC power supply with a three-prong power cord for your mount.  Get rid of the heavy, old school stuff.
6. Connect your pier to the electrical ground.
7. Add a quality surge suppressor/line filter to your observatory.
8. Add a UPS to your observatory.
9. If you have a TI dome, insulate its motors and electrical system from everything else in your observatory that isn't 120VAC or its single communications connection to your laptop.
 
I hope this helps.
 
 
-Christopher Erickson
Observatory engineer
Summit Kinetics
Waikoloa, HI 96738
www.summitkinetics.com
 


From: ap-gto@... [mailto:ap-gto@...]
Sent: Wednesday, October 18, 2017 4:19 AM
To: ap-gto@...
Subject: [ap-gto] strange electrical issue - anyone have any knowledge of what to do.

I'm a proud new owner of a Mach1.  I had an issue that seems impossible.


I have a dome, and I power everything via one AC outlet on my gate near the dome.  The GF was bad on it so I replaced the receptible. The GFI "text" works... but I'm no electrician.  (could I have goofed?)


Installing the Mach1 and doing some initial testing was all good. I started playing with APCC and was working out kinks and getting SGP all set up.  With some initial problems with wifi,  I found I had to reboot the CP4 often during various configuration tweaks and the easiest way to do that was to remove and replace the 12v power plug on the CP4. 


HERES THE WEIRD PART.  Laptop was running and doing fine, when I removed the 12v from CP4 and waited, then plugged it back in - upon plugging it into the CP4 the laptop went black as if all power was cut.

(if AC power is cut normally it will just continue via it's battery). But no...  dead. 


It didn't really hit me that plugging in the 12V cp4 power caused it... I rebooted the laptop and continued. 

a bit later I did a power off/on of the CP4 and once again the laptop went black.  This time I thought 'weird was that due to the 12v Cp4 power plug?  so I rebooted the laptop and TRIED IT AGAIN on purpose to see if that caused the laptop to die.  YES upon putting the plug in a 3rd time, laptop died and this time, would not reboot. (it's been sent in order warranty repair).  = ( 


Assuming it a fluke... bad laptop?  or maybe by using a 2 prong extension cord from the AC outlet to my setup instead of a 3 prong with ground, I swapped out the extension cord to 3 prong and ground. 


I dig out my OLD laptop to get by... and spend a full day installing software and drivers and getting it ready to take over.  thinking it may have been some sort of ground short/loop? (I dunno I'm no electrician)... I figure the ground solved the issue.  


Everything was working and I left the laptop and set up running as I left to have dinner. Upon my return, the laptop was depowered. And would not boot.  It acts like my other laptop that died, in that it powers on with just a fan and power light - but no screen and no bios or booting or error. 


MY FEAR...  I wait a month or more for my laptop to be repaired only to set it up and have this happen again.

Or worse, the CP4 dies?  Or is it the new CP4 causing this?  Not only am I out of commission until I get another laptop but I have nothing to do but stress over the WIERD situation? 


ideas?


The AC power goes from AC outlet to dome, to a power strip. Another power strip is plugged into one of those outlets and powers all the scope electronics.  The first power strip runs things like LED lights in the dome, fan etc.  (nothing else has had an issue).  I have a 10amp AC/DC box that runs up to a rigrunner to delegate power to focuser, heater, filters, mount cameras etc. nothing else has had an issue (yet?)


I do not suspect that powering up the Cp4 would have anything to do with the laptop via AC power... so I'm wondering.   Could it be the ethernet?  and/Or the USB connection?  Both of which were running from cp4 to the laptops.  These would be the only direct link between the Cp4 and the laptops to cause any problem.


Laptop has it's own AC/DC converter and it's own outlet on the power strip.  I am thinking it has to be related to the CP4 to laptop connection?  


Ron in MI.




Virus-free. www.avg.com



Re: strange electrical issue - anyone have any knowledge of what to do.

Ron Kramer
 

But how to test it? My only test destorys laptops? 


Try running your CP4 off a 12 volt battery. That would confirm that something is flaky with your Dc power supplies.

Rolando

On Wed, Oct 18, 2017 at 3:24 PM, chris1011@... [ap-gto] <ap-gto@...> wrote:
 

Try running your CP4 off a 12 volt battery. That would confirm that something is flaky with your Dc power supplies.

Rolando




-----Original Message-----
From: Ron Kramer ronkramer1957@... [ap-gto] <ap-gto@...>
To: ap-gto <ap-gto@...>
Sent: Wed, Oct 18, 2017 2:13 pm
Subject: Re: [ap-gto] strange electrical issue - anyone have any knowledge of what to do.



I have gone to 3 prong with ground, that actually was in use with the 2nd laptop. (before it died).
Laptops don't display anything or even beep. They just come up with power light and fan.  That's all.

Battery on the first new laptop was fully charged and if power is disrupted, the battery takes over.  (like if I pull the AC or turn off the power strip, the laptop would stay running). 
What puzzles me is why they go blank when the 12v connector is applied into the cp4? 

no bios message or anything else (ACER splash screen is ever seen, just black).
I'm quite good with computers... I've never seen one power up with fan and nothing else.  I don't know if I can wait - I think I might have to move a extra desktop out there
but the 1.5 days of software install and configuration is getting old. 

I'm more concerned with why power drops when plugging in the CP4. 
NOTHING else shuts down.  

On Wed, Oct 18, 2017 at 11:03 AM, 'Joseph Zeglinski' J.Zeglinski@... [ap-gto] <ap-gto@...> wrote:
 
Ron,
 
    Could it be that you have flakey power from the AC outlet at the “gate”?
 
    Unexpected glitches could cause Windows to crash – without a formal shutdown. That might be corrupting your Windows boot partition. When you try to reboot, the laptop can’t find a proper boot record, so it stays black ... usually a text message says to insert a bootable device.
 
    I would suggest installing even an inexpensive small UPS in the dome, so that the unexpected power dropouts are carried through for upto 10 minutes. Some,  even small UPS (like from TrippLite), have a USB cable talking to Windows, and when it senses a switch over to its battery, it issues a formal Windows Hibernate or shutdown, when its battery nears being drained, or by your specified shutdown period.
 
    However, the battery in the laptop should have already handled this  – and the power option in Windows is normally set up to shut down Windows when its battery reaches 10%. Check your power option plan to confirm.  If for some reason, there is no grace percentage in your power plan, it would also crash Windows, possibly irrecoverably without user Win boot record repairs. So, this may still not account for your problem.
 
    Finally, very many, if not most telescope device electronics seem to be meant for battery operation, so the circuit board LOGIC ground wires are tied directly to Chassis (Earth) ground. Without that green ground wire, there is no place to dispel a short except the DC supply, via whatever other circuit boards traces “conveniently” share that common  Earth/Logic connection. Since you haven’t provided one in the power cable, everything else is at risk.
 
    I may be possibly overstating the latter case, but I wouldn’t chance not using at least a properly grounded power cord from the mains.
 
    In any case, you should have a UPS – fed by a proper 3-wire power cord, since UPS’s complain and probably won’t function without a safety Earth Ground connection to the main AC supply.
 
    Have you tried booting to laptop BIOS, to see if it is just a boot record damage or the laptop really is fried? The former can be fixed by yourself, with some time and effort. Worth investigating before returning more laptops for electronic repair. Possibly a software tech at the local PC store, can get the laptop booting again – quicker than shipping it to the manufacturer.
 
Good luck,
Joe





Re: strange electrical issue - anyone have any knowledge of what to do.

Ron Kramer
 

Thanks - the typical AC/DC power supplies as you are aware always seem to have only 2 prong. (no ground AC plugs)?  should I shelve these cheap units and get one larger (higher quality AC-DC unit?)  Powering all from it and making sure it has 3 prong AC cord?

With a volt meter - in AC mode? test the DC line out for AC?  

What do you guys use for power in a AC (home) situation? 


__________________________ quote

I assume that both your laptop and your mount electronics are being operated with low voltage DC. That means that the power supplies are isolated from the 120 volt mains by isolation transformers. If the transformers are not faulty, then no 60 cycle current would be superimposed on the low voltage DC lines. However, I have seen many times that some of these power supplies are faulty and have substantial leakage currents that can elevate the low voltage circuits well above ground. 

The mount CP4 has internal protection (transorbs) on every pin that goes in or out and is thus protected against stray leakage currents. That may not be the case for commercial laptops which are not meant to be used outdoors where you can have such leakage currents. If everything is plugged in and grounded, there may be a path to ground for these leakage currents, but unplugging the CP4 can eliminate the ground path and allow high voltage 60 cycle current to flow into your laptop input ports. 

You may have to use an AC voltmeter to check your power supplies against the AC circuit ground to see if there is stray voltage on the low voltage DC side. I have heard of cases where the DC power supply had enough voltage due to a faulty power transformer that a person received a considerable shock when touching his telescope while standing on wet grass.

One other thing I would recommend is to ground all power supplies together to a common ground so that you don't have inadvertent ground currents running thru USB or other connectors.

Rolando

On Wed, Oct 18, 2017 at 12:33 PM, chris1011@... [ap-gto] <ap-gto@...> wrote:
 

I assume that both your laptop and your mount electronics are being operated with low voltage DC. That means that the power supplies are isolated from the 120 volt mains by isolation transformers. If the transformers are not faulty, then no 60 cycle current would be superimposed on the low voltage DC lines. However, I have seen many times that some of these power supplies are faulty and have substantial leakage currents that can elevate the low voltage circuits well above ground.

The mount CP4 has internal protection (transorbs) on every pin that goes in or out and is thus protected against stray leakage currents. That may not be the case for commercial laptops which are not meant to be used outdoors where you can have such leakage currents. If everything is plugged in and grounded, there may be a path to ground for these leakage currents, but unplugging the CP4 can eliminate the ground path and allow high voltage 60 cycle current to flow into your laptop input ports.

You may have to use an AC voltmeter to check your power supplies against the AC circuit ground to see if there is stray voltage on the low voltage DC side. I have heard of cases where the DC power supply had enough voltage due to a faulty power transformer that a person received a considerable shock when touching his telescope while standing on wet grass.

One other thing I would recommend is to ground all power supplies together to a common ground so that you don't have inadvertent ground currents running thru USB or other connectors.

Rolando




-----Original Message-----
From: ronkramer1957@... [ap-gto] <ap-gto@...>
To: ap-gto <ap-gto@...>
Sent: Wed, Oct 18, 2017 9:20 am
Subject: [ap-gto] strange electrical issue - anyone have any knowledge of what to do.



I'm a proud new owner of a Mach1.  I had an issue that seems impossible.

I have a dome, and I power everything via one AC outlet on my gate near the dome.  The GF was bad on it so I replaced the receptible. The GFI "text" works... but I'm no electrician.  (could I have goofed?)

Installing the Mach1 and doing some initial testing was all good. I started playing with APCC and was working out kinks and getting SGP all set up.  With some initial problems with wifi,  I found I had to reboot the CP4 often during various configuration tweaks and the easiest way to do that was to remove and replace the 12v power plug on the CP4. 

HERES THE WEIRD PART.  Laptop was running and doing fine, when I removed the 12v from CP4 and waited, then plugged it back in - upon plugging it into the CP4 the la ptop went black as if all power was cut.
(if AC power is cut normally it will just continue via it's battery). But no...  dead. 

It didn't really hit me that plugging in the 12V cp4 power caused it... I rebooted the laptop and continued. 
a bit later I did a power off/on of the CP4 and once again the laptop went black.  This time I thought 'weird was that due to the 12v Cp4 power plug?  so I rebooted the laptop and TRIED IT AGAIN on purpose to see if that caused the laptop to die.  YES upon putting the plug in a 3rd time, laptop died and this time, would not reboot. (it's been sent in order warranty repair).  = ( 

Assuming it a fluke... bad laptop?  or maybe by using a 2 prong extension cord from the AC outlet to my setup instead of a 3 prong with ground, I swapped out the extension cord to 3 prong and ground. 

I dig out my OLD laptop to get by... and spend a full day installing software and drivers and getting it ready to take over.  thinking it may have been some sort of ground short/loop? (I dunno I'm no electrician)... I figure the ground solved the issue.  

Everything was working and I left the laptop and set up running as I left to have dinner. Upon my return, the laptop was depowered. And would not boot.  It acts like my other laptop that died, in that it powers on with just a fan and power light - but no screen and no bios or booting or error. 

MY FEAR...  I wait a month or more for my laptop to be repaired only to set it up and have this happen again.
Or worse, the CP4 dies?  Or is it the new CP4 causing this?  Not only am I out of commission until I get a nother laptop but I have nothing to do but stress over the WIERD situation? 

ideas?

The AC power goes from AC outlet to dome, to a power strip. Another power strip is plugged into one of those outlets and powers all the scope electronics.  The first power strip runs things like LED lights in the dome, fan etc.  (nothing else has had an issue).  I have a 10amp AC/DC box that runs up to a rigrunner to delegate power to focuser, heater, filters, mount cameras etc. nothing else has had an issue (yet?)

I do not suspect that powering up the Cp4 would have anything to do with the laptop via AC power... so I'm wondering.   Could it be the ethernet?  and/Or the USB connection?  Both of which were running from cp4 to the laptops.  These would be the only direct link between the Cp4 and the laptops to cause any problem.

Laptop has it's own AC/DC converter and it's own outlet on the power strip.  I am thinking it has to be related to the CP4 to laptop connection?  

Ron in MI.






Re: strange electrical issue - anyone have any knowledge of what to do.

Roland Christen
 

I will re-iterate. For now put the CP4 on a 12 volt battery. That will eliminate any possibility of stray 60 cycle AC voltage from entering your laptop from a possible bad AC/DC power supply. If this fixes the problem, then you know that you need to check all your AC/DC power supplies for stray leakage currents.

Meanwhile you can ask the guy who is repairing your laptops what exactly caused them to fail.

Rolando



-----Original Message-----
From: Ron Kramer ronkramer1957@... [ap-gto]
To: ap-gto
Sent: Thu, Oct 19, 2017 1:07 pm
Subject: Re: [ap-gto] strange electrical issue - anyone have any knowledge of what to do.



Let me clarify. Cp4 is powered by AC/DC power supply.   The rig runner has a 10amp AC/DC power supply. 
the laptop has it's own  AC/DC power supply.  All 3 are plugged into the same AC main. 

I suspect it's coming from USB or ethernet.  CP4 to laptops.  (is there any sort of way to put a surge protector in line?  Or I'll try to refrain from havine those connections in the laptop when I need to reboot the cp4.

I'm about to move a desktop out to the dome.  (NEXDOME) doesn't have a power supply.  Well, I added the rotator yesterday that has a 5amp AC/DC but that wasn't an issue. 

I'll go back up and read your replies. I only scanned one real quick to make this reply.




On Wed, Oct 18, 2017 at 3:39 PM, 'Christopher Erickson' christopher.k.erickson@... [ap-gto] <ap-gto@...> wrote:
 
And if all of this were being done absolutely correct and according to code, the observatory should probably have a sub-panel and its own connection to a good earth ground.
 
 
-Christopher Erickson
Observatory engineer
Summit Kinetics
Waikoloa, HI 96738
www.summitkinetics.com
 


From: Christopher Erickson [mailto:christopher.k.erickson@...]
Sent: Wednesday, October 18, 2017 9:36 AM
To: 'ap-gto@...'
Subject: RE: [ap-gto] strange electrical issue - anyone have any knowledge of what to do.

Speaking as an electrical engineer and journeyman electrician:
 
Spurious ground differentials.  Your mount power supply is the most likely culprit.
 
The communications ports on your laptops (USB, RS-232, HDMI, VGA, SDHC, etc.) are not protected in any way from spurious ground differentials and any other grounding problems that might exist in your mount power supply.  The CP4 has hardened ports so it will be the laptop that suffers.
 
You didn't mention what brand and model of dome you have.  Technical Innovations (home dome, pro dome) use horrible 12V power supplies with minimal/no filtration that can cause problems for any electronics mounted in them or on them.  Don't be tempted to run anything else from a TI dome power supply.  It will be a source of countless problems and damaged equipment.
 
Additionally, TI uses automotive windshield wiper motors to drive their domes.  The frame of those motors was designed to be grounded to the -12V side of a car's power system.  TI drives the windshield wiper motors bidirectionally, which is not how they were designed.  This means that when being driven in reverse, the frames of the motors are at +12V instead of -12V.  This can create a shorting hazard in the observatory, as well as being disruptive to electronics that could come in contact with those motors or anything conductive that those motors are attached to.
 
1. Have an electrician inspect your gate outlet to make sure you didn't swap the hot and neutral.
2. Make sure your extension from the gate outlet to the observatory is at least 12GA and not over 100'.
3. Make sure the insulation and protection on your power extension from the gate meets electrical code.
4. Ground everything in the observatory.  No more two-prong 120VAC power cords, power strips and stuff.
5. Get a modern, switching 2.5A 12VDC power supply with a three-prong power cord for your mount.  Get rid of the heavy, old school stuff.
6. Connect your pier to the electrical ground.
7. Add a quality surge suppressor/line filter to your observatory.
8. Add a UPS to your observatory.
9. If you have a TI dome, insulate its motors and electrical system from everything else in your observatory that isn't 120VAC or its single communications connection to your laptop.
 
I hope this helps.
 
 
-Christopher Erickson
Observatory engineer
Summit Kinetics
Waikoloa, HI 96738
www.summitkinetics.com
 


From: ap-gto@... [mailto:ap-gto@...]
Sent: Wednesday, October 18, 2017 4:19 AM
To: ap-gto@...
Subject: [ap-gto] strange electrical issue - anyone have any knowledge of what to do.

I'm a proud new owner of a Mach1.  I had an issue that seems impossible.

I have a dome, and I power everything via one AC outlet on my gate near the dome.  The GF was bad on it so I replaced the receptible. The GFI "text" works... but I'm no electrician.  (could I have goofed?)

Installing the Mach1 and doing some initial testing was all good. I started playing with APCC and was working out kinks and getting SGP all set up.  With some initial problems with wifi,  I found I had to reboot the CP4 often during various configuration tweaks and the easiest way to do that was to remove and replace the 12v power plug on the CP4. 

HERES THE WEIRD PART.  Laptop was running and doing fine, when I removed the 12v from CP4 and waited, then plugged it back in - upon plugging it into the CP4 the laptop went black as if all power was cut.
(if AC power is cut normally it will just continue via it's battery). But no...  dead. 

It didn't really hit me that plugging in the 12V cp4 power caused it... I rebooted the laptop and continued. 
a bit later I did a power off/on of the CP4 and once again the laptop went black.  This time I thought 'weird was that due to the 12v Cp4 power plug?  so I rebooted the laptop and TRIED IT AGAIN on purpose to see if that caused the laptop to die.  YES upon putting the plug in a 3rd time, laptop died and this time, would not reboot. (it's been sent in order warranty repair).  = ( 

Assuming it a fluke... bad laptop?  or maybe by using a 2 prong extension cord from the AC outlet to my setup instead of a 3 prong with ground, I swapped out the extension cord to 3 prong and ground. 

I dig out my OLD laptop to get by... and spend a full day installing software and drivers and getting it ready to take over.  thinking it may have been some sort of ground short/loop? (I dunno I'm no electrician)... I figure the ground solved the issue.  

Everything was working and I left the laptop and set up running as I left to have dinner. Upon my return, the laptop was depowered. And would not boot.  It acts like my other laptop that died, in that it powers on with just a fan and power light - but no screen and no bios or booting or error. 

MY FEAR...  I wait a month or more for my laptop to be repaired only to set it up and have this happen again.
Or worse, the CP4 dies?  Or is it the new CP4 causing this?  Not only am I out of commission until I get another laptop but I have nothing to do but stress over the WIERD situation? 

ideas?

The AC power goes from AC outlet to dome, to a power strip. Another power strip is plugged into one of those outlets and powers all the scope electronics.  The first power strip runs things like LED lights in the dome, fan etc.  (nothing else has had an issue).  I have a 10amp AC/DC box that runs up to a rigrunner to delegate power to focuser, heater, filters, mount cameras etc. nothing else has had an issue (yet?)

I do not suspect that powering up the Cp4 would have anything to do with the laptop via AC power... so I'm wondering.   Could it be the ethernet?  and/Or the USB connection?  Both of which were running from cp4 to the laptops.  These would be the only direct link between the Cp4 and the laptops to cause any problem.

Laptop has it's own AC/DC converter and it's own outlet on the power strip.  I am thinking it has to be related to the CP4 to laptop connection?  

Ron in MI.



Virus-free. www.avg.com




Re: strange electrical issue - anyone have any knowledge of what to do.

Ron Kramer
 

Let me clarify. Cp4 is powered by AC/DC power supply.   The rig runner has a 10amp AC/DC power supply. 
the laptop has it's own  AC/DC power supply.  All 3 are plugged into the same AC main. 

I suspect it's coming from USB or ethernet.  CP4 to laptops.  (is there any sort of way to put a surge protector in line?  Or I'll try to refrain from havine those connections in the laptop when I need to reboot the cp4.

I'm about to move a desktop out to the dome.  (NEXDOME) doesn't have a power supply.  Well, I added the rotator yesterday that has a 5amp AC/DC but that wasn't an issue. 

I'll go back up and read your replies. I only scanned one real quick to make this reply.




On Wed, Oct 18, 2017 at 3:39 PM, 'Christopher Erickson' christopher.k.erickson@... [ap-gto] <ap-gto@...> wrote:
 

And if all of this were being done absolutely correct and according to code, the observatory should probably have a sub-panel and its own connection to a good earth ground.
 
 
-Christopher Erickson
Observatory engineer
Summit Kinetics
Waikoloa, HI 96738
www.summitkinetics.com
 


From: Christopher Erickson [mailto:christopher.k.erickson@...]
Sent: Wednesday, October 18, 2017 9:36 AM
To: 'ap-gto@...'
Subject: RE: [ap-gto] strange electrical issue - anyone have any knowledge of what to do.

Speaking as an electrical engineer and journeyman electrician:
 
Spurious ground differentials.  Your mount power supply is the most likely culprit.
 
The communications ports on your laptops (USB, RS-232, HDMI, VGA, SDHC, etc.) are not protected in any way from spurious ground differentials and any other grounding problems that might exist in your mount power supply.  The CP4 has hardened ports so it will be the laptop that suffers.
 
You didn't mention what brand and model of dome you have.  Technical Innovations (home dome, pro dome) use horrible 12V power supplies with minimal/no filtration that can cause problems for any electronics mounted in them or on them.  Don't be tempted to run anything else from a TI dome power supply.  It will be a source of countless problems and damaged equipment.
 
Additionally, TI uses automotive windshield wiper motors to drive their domes.  The frame of those motors was designed to be grounded to the -12V side of a car's power system.  TI drives the windshield wiper motors bidirectionally, which is not how they were designed.  This means that when being driven in reverse, the frames of the motors are at +12V instead of -12V.  This can create a shorting hazard in the observatory, as well as being disruptive to electronics that could come in contact with those motors or anything conductive that those motors are attached to.
 
1. Have an electrician inspect your gate outlet to make sure you didn't swap the hot and neutral.
2. Make sure your extension from the gate outlet to the observatory is at least 12GA and not over 100'.
3. Make sure the insulation and protection on your power extension from the gate meets electrical code.
4. Ground everything in the observatory.  No more two-prong 120VAC power cords, power strips and stuff.
5. Get a modern, switching 2.5A 12VDC power supply with a three-prong power cord for your mount.  Get rid of the heavy, old school stuff.
6. Connect your pier to the electrical ground.
7. Add a quality surge suppressor/line filter to your observatory.
8. Add a UPS to your observatory.
9. If you have a TI dome, insulate its motors and electrical system from everything else in your observatory that isn't 120VAC or its single communications connection to your laptop.
 
I hope this helps.
 
 
-Christopher Erickson
Observatory engineer
Summit Kinetics
Waikoloa, HI 96738
www.summitkinetics.com
 


From: ap-gto@... [mailto:ap-gto@...]
Sent: Wednesday, October 18, 2017 4:19 AM
To: ap-gto@...
Subject: [ap-gto] strange electrical issue - anyone have any knowledge of what to do.

I'm a proud new owner of a Mach1.  I had an issue that seems impossible.


I have a dome, and I power everything via one AC outlet on my gate near the dome.  The GF was bad on it so I replaced the receptible. The GFI "text" works... but I'm no electrician.  (could I have goofed?)


Installing the Mach1 and doing some initial testing was all good. I started playing with APCC and was working out kinks and getting SGP all set up.  With some initial problems with wifi,  I found I had to reboot the CP4 often during various configuration tweaks and the easiest way to do that was to remove and replace the 12v power plug on the CP4. 


HERES THE WEIRD PART.  Laptop was running and doing fine, when I removed the 12v from CP4 and waited, then plugged it back in - upon plugging it into the CP4 the laptop went black as if all power was cut.

(if AC power is cut normally it will just continue via it's battery). But no...  dead. 


It didn't really hit me that plugging in the 12V cp4 power caused it... I rebooted the laptop and continued. 

a bit later I did a power off/on of the CP4 and once again the laptop went black.  This time I thought 'weird was that due to the 12v Cp4 power plug?  so I rebooted the laptop and TRIED IT AGAIN on purpose to see if that caused the laptop to die.  YES upon putting the plug in a 3rd time, laptop died and this time, would not reboot. (it's been sent in order warranty repair).  = ( 


Assuming it a fluke... bad laptop?  or maybe by using a 2 prong extension cord from the AC outlet to my setup instead of a 3 prong with ground, I swapped out the extension cord to 3 prong and ground. 


I dig out my OLD laptop to get by... and spend a full day installing software and drivers and getting it ready to take over.  thinking it may have been some sort of ground short/loop? (I dunno I'm no electrician)... I figure the ground solved the issue.  


Everything was working and I left the laptop and set up running as I left to have dinner. Upon my return, the laptop was depowered. And would not boot.  It acts like my other laptop that died, in that it powers on with just a fan and power light - but no screen and no bios or booting or error. 


MY FEAR...  I wait a month or more for my laptop to be repaired only to set it up and have this happen again.

Or worse, the CP4 dies?  Or is it the new CP4 causing this?  Not only am I out of commission until I get another laptop but I have nothing to do but stress over the WIERD situation? 


ideas?


The AC power goes from AC outlet to dome, to a power strip. Another power strip is plugged into one of those outlets and powers all the scope electronics.  The first power strip runs things like LED lights in the dome, fan etc.  (nothing else has had an issue).  I have a 10amp AC/DC box that runs up to a rigrunner to delegate power to focuser, heater, filters, mount cameras etc. nothing else has had an issue (yet?)


I do not suspect that powering up the Cp4 would have anything to do with the laptop via AC power... so I'm wondering.   Could it be the ethernet?  and/Or the USB connection?  Both of which were running from cp4 to the laptops.  These would be the only direct link between the Cp4 and the laptops to cause any problem.


Laptop has it's own AC/DC converter and it's own outlet on the power strip.  I am thinking it has to be related to the CP4 to laptop connection?  


Ron in MI.




Virus-free. www.avg.com



Moment of Inertia Loading of 1200GTO

Arnold C. Ashcraft
 

I have recently obtained a used AP1200GTO in excellent conditions and am in the process of building a pier for it.  My immediate plans for it are to mount a CPC1100EdgeHD that I am de-forking so I can get a handle on guided exposures.  I expect that the mount will have no difficulty with this OTA.  However, I might also want to use the mount for an f/14, 7.25" aperture Schupmann Medial, perhaps mounting it in tandem with the C11.  The Schupmann is quite lightweight for its size, being constructed from a spruce framework and covered with 1/8" Luan mahogany.  The entire OTA is a little over 100" long and weighs about 25 lbs.  The weight is certainly no problem for the mount, however, my concern is the moment of inertia of such a long tube and whether the mount could handle it in GoTo operations without losing track of where it is pointing.  The single element objective alone weighs 1.75 kg and is located 1.4 meters from the center of gravity.  As I figure it, the moment of inertia of the objective is 3.4 kg m^2.  My guess is that the total moment will work out to be around 10 kg m^2.


Does anyone know if the mount can handle this?  It probably presents considerably less loading than a 7 or 8 inch f/14 refractor would since they normally have metal tubes and cells and two elements in the objective.  Anyone have experience mounting, say, an 8" f/14 refractor on an AP1200GTO?


Clif Ashcraft


Re: APCC dual THUMs? For temp diffs?

C. G. Anderson
 

Yes, thanks all.  I had the THUM drivers installed, and I thought I didn't. Killed them and it works now. But still like to have room for one more! CG


Re: APPM and 360 degree slew

Bill Long
 

Nicely done!!! Good work AP on customer service!




From: ap-gto@... on behalf of AstroEric@... [ap-gto]
Sent: Wednesday, October 18, 2017 10:32 PM
To: ap-gto@...
Subject: [ap-gto] Re: APPM and 360 degree slew
 
 

EXCELLENT CUSTOMER SERVICE.  THANKS A TON HOWARD!!!!

Howard called me at at 11:15 pm his time and walked me through the steps to determine AND FIX the problem.

Prior to the firmware upgrade today I had the initial firmware which did not have code to prevent 360 degree slews, so when I ran APPM last night, it slewed 360 (not sure why it did that at point 46 and not earlier though).  That put RA past an encoder limit, which was indicated by one of the debugging commands Howard had me enter.  That limit is what caused the yellow light.
The fix was basically to turn off the limits and slew the mount 360 in the other direction, putting the mount back within limits.  We verified that with additional debugging commands.

The new firmware When the encoder program functionality is added to APPC, it should give an error when an encoder limit is reached.

Eric


Re: APPM and 360 degree slew

Eric Claeys
 

EXCELLENT CUSTOMER SERVICE.  THANKS A TON HOWARD!!!!

Howard called me at at 11:15 pm his time and walked me through the steps to determine AND FIX the problem.

Prior to the firmware upgrade today I had the initial firmware which did not have code to prevent 360 degree slews, so when I ran APPM last night, it slewed 360 (not sure why it did that at point 46 and not earlier though).  That put RA past an encoder limit, which was indicated by one of the debugging commands Howard had me enter.  That limit is what caused the yellow light.
The fix was basically to turn off the limits and slew the mount 360 in the other direction, putting the mount back within limits.  We verified that with additional debugging commands.

The new firmware <should> prevent 360 degree slews which I'll test with APPM tomorrow.
When the encoder program functionality is added to APPC, it should give an error when an encoder limit is reached.

Eric


Re: APPM and 360 degree slew

Bill Long
 

Thanks Roland. Always nice to get the insider scoop on what the yellow light means. I have personally only seen it one time, and it was due to me falling asleep and the tracking led my camera into the tripod and the motors shut off and protected my gear. :)




From: ap-gto@... on behalf of chris1011@... [ap-gto]
Sent: Wednesday, October 18, 2017 9:32 PM
To: ap-gto@...
Subject: Re: [ap-gto] Re: APPM and 360 degree slew
 
 

Yes, I see your point. The clue for me was that he could slew east, so that indicated that the motor was not in stalled condition, rather it hit an internal emergency limit, which also triggers the yellow light. This is not well known, so I wanted to pass this on in case that ever happens to anyone else. It also prevents the mount from wrapping internal cables round and round until they break.

In any case, Howard is on it at the moment and we will see what the cure is.

Rolando




-----Original Message-----
From: Bill Long bill@... [ap-gto]
To: ap-gto Sent: Wed, Oct 18, 2017 11:26 pm
Subject: Re: [ap-gto] Re: APPM and 360 degree slew



I did see those but Eric's initial post doesnt suggest that:


Upgraded firmware on 1100GTO (from 01 to 10) today.
Followed directions, installed parts 1, 2, and wifi.  What I saw exactly matched the instructions.
Did not try to slew or do anything else and left mount at Park 3.

Tried running APPM starting at point 45:
    From park 3 it slewed pointing roughly northwest near the meridian.
    It took a picture and had status = OK.

    It then started point 46 by slewing the OTA to the east side with counterweights horizontal, pointing ~ at meridian.
    Paused a couple seconds then started slewing to point 46's location.
    The scope moved just a little and abruptly stopped.
    Counterweights ended up slightly above mount.
    CP4's yellow light came on.


He slewed the mount, then it stopped and the amber light came on. How would this be different?

Eric -- Do you use custom limits or not?


From: ap-gto@... gto@...> on behalf of chris1011@... [ap-gto] gto@...>
Sent: Wednesday, October 18, 2017 9:18 PM
To: ap-gto@...
Subject: Re: [ap-gto] Re: APPM and 360 degree slew
 
 
See my other posts.

Rolando



-----Original Message-----
From: Bill Long bill@... [ap-gto] gto@...>
To: ap-gto gto@...>
Sent: Wed, Oct 18, 2017 11:17 pm
Subject: Re: [ap-gto] Re: APPM and 360 degree slew



My guess, and of course it is just speculative -- the motor cable came loose (best case) or the motor cable had tension applied to it while slewing and resulted in cable damage (worst case). 



From: ap-gto@... gto@...> on behalf of AstroEric@... [ap-gto] gto@...>
Sent: Wednesday, October 18, 2017 9:15 PM
To: ap-gto@...
Subject: [ap-gto] Re: APPM and 360 degree slew
 
 
Rolando,
I just posted more info in a separate thread, then saw your reply so also just emailed Howard with info including my phone number.
Eric





Re: APPM and 360 degree slew

Roland Christen
 

Yes, I see your point. The clue for me was that he could slew east, so that indicated that the motor was not in stalled condition, rather it hit an internal emergency limit, which also triggers the yellow light. This is not well known, so I wanted to pass this on in case that ever happens to anyone else. It also prevents the mount from wrapping internal cables round and round until they break.

In any case, Howard is on it at the moment and we will see what the cure is.

Rolando



-----Original Message-----
From: Bill Long bill@... [ap-gto]
To: ap-gto
Sent: Wed, Oct 18, 2017 11:26 pm
Subject: Re: [ap-gto] Re: APPM and 360 degree slew



I did see those but Eric's initial post doesnt suggest that:


Upgraded firmware on 1100GTO (from 01 to 10) today.
Followed directions, installed parts 1, 2, and wifi.  What I saw exactly matched the instructions.
Did not try to slew or do anything else and left mount at Park 3.

Tried running APPM starting at point 45:
    From park 3 it slewed pointing roughly northwest near the meridian.
    It took a picture and had status = OK.

    It then started point 46 by slewing the OTA to the east side with counterweights horizontal, pointing ~ at meridian.
    Paused a couple seconds then started slewing to point 46's location.
    The scope moved just a little and abruptly stopped.
    Counterweights ended up slightly above mount.
    CP4's yellow light came on.


He slewed the mount, then it stopped and the amber light came on. How would this be different?

Eric -- Do you use custom limits or not?


From: ap-gto@... gto@...> on behalf of chris1011@... [ap-gto] gto@...>
Sent: Wednesday, October 18, 2017 9:18 PM
To: ap-gto@...
Subject: Re: [ap-gto] Re: APPM and 360 degree slew
 
 
See my other posts.

Rolando



-----Original Message-----
From: Bill Long bill@... [ap-gto] gto@...>
To: ap-gto gto@...>
Sent: Wed, Oct 18, 2017 11:17 pm
Subject: Re: [ap-gto] Re: APPM and 360 degree slew



My guess, and of course it is just speculative -- the motor cable came loose (best case) or the motor cable had tension applied to it while slewing and resulted in cable damage (worst case). 



From: ap-gto@... gto@...> on behalf of AstroEric@... [ap-gto] gto@...>
Sent: Wednesday, October 18, 2017 9:15 PM
To: ap-gto@...
Subject: [ap-gto] Re: APPM and 360 degree slew
 
 
Rolando,
I just posted more info in a separate thread, then saw your reply so also just emailed Howard with info including my phone number.
Eric





Re: APPM and 360 degree slew

Bill Long
 

I did see those but Eric's initial post doesnt suggest that:



Upgraded firmware on 1100GTO (from 01 to 10) today.
Followed directions, installed parts 1, 2, and wifi.  What I saw exactly matched the instructions.
Did not try to slew or do anything else and left mount at Park 3.

Tried running APPM starting at point 45:
    From park 3 it slewed pointing roughly northwest near the meridian.
    It took a picture and had status = OK.

    It then started point 46 by slewing the OTA to the east side with counterweights horizontal, pointing ~ at meridian.
    Paused a couple seconds then started slewing to point 46's location.
    The scope moved just a little and abruptly stopped.
    Counterweights ended up slightly above mount.
    CP4's yellow light came on.



He slewed the mount, then it stopped and the amber light came on. How would this be different?

Eric -- Do you use custom limits or not?


From: ap-gto@... on behalf of chris1011@... [ap-gto]
Sent: Wednesday, October 18, 2017 9:18 PM
To: ap-gto@...
Subject: Re: [ap-gto] Re: APPM and 360 degree slew
 
 

See my other posts.

Rolando




-----Original Message-----
From: Bill Long bill@... [ap-gto]
To: ap-gto
Sent: Wed, Oct 18, 2017 11:17 pm
Subject: Re: [ap-gto] Re: APPM and 360 degree slew



My guess, and of course it is just speculative -- the motor cable came loose (best case) or the motor cable had tension applied to it while slewing and resulted in cable damage (worst case). 



From: ap-gto@... gto@...> on behalf of AstroEric@... [ap-gto] gto@...>
Sent: Wednesday, October 18, 2017 9:15 PM
To: ap-gto@...
Subject: [ap-gto] Re: APPM and 360 degree slew
 
 
Rolando,
I just posted more info in a separate thread, then saw your reply so also just emailed Howard with info including my phone number.
Eric



Re: APPM and 360 degree slew

Roland Christen
 

See my other posts.

Rolando



-----Original Message-----
From: Bill Long bill@... [ap-gto]
To: ap-gto
Sent: Wed, Oct 18, 2017 11:17 pm
Subject: Re: [ap-gto] Re: APPM and 360 degree slew



My guess, and of course it is just speculative -- the motor cable came loose (best case) or the motor cable had tension applied to it while slewing and resulted in cable damage (worst case). 



From: ap-gto@... gto@...> on behalf of AstroEric@... [ap-gto] <ap-gto@...>
Sent: Wednesday, October 18, 2017 9:15 PM
To: ap-gto@...
Subject: [ap-gto] Re: APPM and 360 degree slew
 
 
Rolando,
I just posted more info in a separate thread, then saw your reply so also just emailed Howard with info including my phone number.
Eric



Re: APPM and 360 degree slew

Roland Christen
 

Actually in this case it means that he went past the internal slew limit of the CP4 RA rotation (more than 360 degrees past the normal rotation angle). The key is that he can slew back out of the limit to the east, but not past the limit in the west, so the motors are not stalled.

Rolando



-----Original Message-----
From: Bill Long bill@... [ap-gto]
To: ap-gto
Sent: Wed, Oct 18, 2017 11:13 pm
Subject: Re: [ap-gto] Re: APPM and 360 degree slew



Now that is customer service!!! :D 

The yellow light can mean a lot of things, but usually it means "Motor Stall" in most of the cases reported here. If you have APCC open the logs and search the log for the string:   error and report back what you find.



From: ap-gto@... gto@...> on behalf of chris1011@... [ap-gto] gto@...>
Sent: Wednesday, October 18, 2017 8:59 PM
To: ap-gto@...
Subject: Re: [ap-gto] Re: APPM and 360 degree slew
 
 
I know it's late but Howard and I are here if you want to send us an e-mail about your problem.

Rolando



-----Original Message-----
From: AstroEric@... [ap-gto] gto@...>
To: ap-gto gto@...>
Sent: Wed, Oct 18, 2017 10:48 pm
Subject: [ap-gto] Re: APPM and 360 degree slew



Ray,
No Comm port errors last night.  No errors in the APCC or ASCOM log files before, during, or after the 360 slew.
I was waiting to hear from AP what my password was to unlock the latest firmware file.  I saw it in my email after the problems last night, so today I upgraded the firmware and tried another APPM.

Now I have a much worse problem - the yellow light on the CP4 is on and the mount won't slew west.  I will report that in a different thread and call AP in the morning.

Eric




Re: APPM and 360 degree slew

Bill Long
 

My guess, and of course it is just speculative -- the motor cable came loose (best case) or the motor cable had tension applied to it while slewing and resulted in cable damage (worst case). 




From: ap-gto@... on behalf of AstroEric@... [ap-gto]
Sent: Wednesday, October 18, 2017 9:15 PM
To: ap-gto@...
Subject: [ap-gto] Re: APPM and 360 degree slew
 
 

Rolando,
I just posted more info in a separate thread, then saw your reply so also just emailed Howard with info including my phone number.
Eric


Re: APPM and 360 degree slew

Roland Christen
 

Howard will be with you shortly.

Rolando



-----Original Message-----
From: AstroEric@... [ap-gto]
To: ap-gto
Sent: Wed, Oct 18, 2017 11:12 pm
Subject: [ap-gto] Re: APPM and 360 degree slew



Rolando, I just posted a new thread with details, then saw your message, so just emailed Howard and included my phone number.

Eric


Re: APPM and 360 degree slew

Bill Long
 

Now that is customer service!!! :D 


The yellow light can mean a lot of things, but usually it means "Motor Stall" in most of the cases reported here. If you have APCC open the logs and search the log for the string:   error and report back what you find.




From: ap-gto@... on behalf of chris1011@... [ap-gto]
Sent: Wednesday, October 18, 2017 8:59 PM
To: ap-gto@...
Subject: Re: [ap-gto] Re: APPM and 360 degree slew
 
 

I know it's late but Howard and I are here if you want to send us an e-mail about your problem.

Rolando




-----Original Message-----
From: AstroEric@... [ap-gto]
To: ap-gto
Sent: Wed, Oct 18, 2017 10:48 pm
Subject: [ap-gto] Re: APPM and 360 degree slew



Ray,
No Comm port errors last night.  No errors in the APCC or ASCOM log files before, during, or after the 360 slew.
I was waiting to hear from AP what my password was to unlock the latest firmware file.  I saw it in my email after the problems last night, so today I upgraded the firmware and tried another APPM.

Now I have a much worse problem - the yellow light on the CP4 is on and the mount won't slew west.  I will report that in a different thread and call AP in the morning.

Eric


Re: Mount won't slew west after firmware upgrade

Roland Christen
 

See my other post.

Rolando



-----Original Message-----
From: AstroEric@... [ap-gto]
To: ap-gto
Sent: Wed, Oct 18, 2017 11:09 pm
Subject: [ap-gto] Mount won't slew west after firmware upgrade



Upgraded firmware on 1100GTO (from 01 to 10) today.
Followed directions, installed parts 1, 2, and wifi.  What I saw exactly matched the instructions.
Did not try to slew or do anything else and left mount at Park 3.

Tried running APPM starting at point 45:
    From park 3 it slewed pointing roughly northwest near the meridian.
    It took a picture and had status = OK.

    It then started point 46 by slewing the OTA to the east side with counterweights horizontal, pointing ~ at meridian.
    Paused a couple seconds then started slewing to point 46's location.
    The scope moved just a little and abruptly stopped.
    Counterweights ended up slightly above mount.
    CP4's yellow light came on.
    Could not slew west with hand controller but could slew oth er directions.
    No errors in APPC and no indication why yellow light was on.
    Nothing in the APCC or ASCOM log files that would indicate a problem.
    Apparently the mount does not tell APCC when the light turns yellow?

Thinking maybe the mount lost track of where it was after the firmware upgrade, I then parked the mount at position 0 via the hand controller, then moved it to park position 3 using hand controller, then unparked from 3.

Exited APCC and tried again.
Got same abrupt stop as before but had Comm error in APCC this time:
    10/18/2017 7:07:48 PM    Sent ':MS#", Error: The operation has timed out.
    10/18/2017 7:07:48 PM    Sent ':MS#", No response from mount

Exited APPM and APPC, and tried with just the keypad:
    * Turned mount on.  CP4's red light came on.
    * Pressed Menu (the PC normally initializes the mount so I had to override that).
    * Pressed location 1, then Goto.  CP4's light turned yellow.  Can slew every direction except west.

Things I tried:
    * two different power supplies (15A and 25A), both of which have worked in past.  The 25A power supply (new this week) displayed 14 volts.
    * plugging only the mount into the power supplies.
    * with motor and encoder cables plugged in and not plugged in.
The mount is well balanced and there are no obstructions.  I even looked in the polar alignment holes at the cables and they are fine.  The first time this happened I was able to slew to park position 3.

The proble m occurs with only the hand controller connected, so it's not a software problem and I suspect the CP4, either hardware or firmware.

Any ideas?

Eric




Re: APPM and 360 degree slew

Eric Claeys
 

Rolando, I just posted a new thread with details, then saw your message, so just emailed Howard and included my phone number.

Eric