Re: Mach1 CP3 pier crash!! (Similar to CP4 crash in another thread)


Joe Zeglinski
 

Hi,
 
    You should be aware that under certain conditions, ANY Pyramid power supply, including the one sold through AP,  may NOT reset its “thermal breaker” after a dropout, for upto a half hour. So, you may give up and walk away too soon. Then all, is fine the next night, but the PYRAMID trips again. The Pyramid (old linear technology) supplies are not very efficient, but are generally well designed. Just heed their warnings and limitations.
 
    If you still have it, carefully read the Instruction Sheet.
Here is  Section #5,  which I transcribed from mine. Substitute “TRIP” ... for their word  “WORK”.
Yes, it does “work” as designed to do. The power supply breaker will trip,  eventually, even if there isn’t an immediate short circuit overload. So, any long duration or repeated mount slews, will eventually have the Pyramid protect itself, so you can take an imposed  coffee break, before going back to imaging :-)

 

(A-5)  WARNING / DEVICES.

 

THIS UNIT IS WELL BUILT WITH A WARNING!   SHUT DOWN FUNCTION.

THE WARNING / SHUT DOWN FUNCTION WILL WORK  -  UNDER THE FOLLOWING UNUSUAL STATUS:

 

1)    THIS UNIT IS USED OVER 15 MINUTES AT 100% OF RATED LOAD.

*

2)    THIS UNIT IS USED OVER 25 MINUTES AT 80% OF RATED LOAD.

*

3)        THE OUTPUT OF THIS UNIT IS SHORT-CIRCUITED/OVER LOAD/OVER TEMPERATURE

 

NOTES:

1) IF THE WARNING/ SHUT DOWN FUNCTION IS CAUSED BY THE ABOVE ITEMS # 1 AND 2 THEN THIS UNIT WILL RETURN TO NORMAL WHEN THE WARNING/SHUTDOWN FUNCTION CONTINUES TO WORK ABOUT 15-30 MINUTES.

*

2) THIS UNIT IS INTENDED TO CONTINUOUSLY WORK AT 70% OF RATED LOAD DESCRIPTION OF THE WARNING / SHUT DOWN FUNCTION:

STEP I.  THE OUTPUT SHUT SHUT DOWN.

STEP 2.  GREEN LED OF NORMAL OFF

STEP 3.  RED LED OF PROTECTION ON.

    Hope this helps explain the situation you had been having. Check you device power requirements.
When it happened to me, the overload eventually tripped the PYRAMID, and while I was away from the mount for a short while, the power supply cooled off and came alive – and the mount resumed its slew, right into the pier, before I could hit the main power switch. I wish the Pyramid would have stayed powered off, but it seems to have been designed to reset and resume without warning and “unattended operation” – NOT always a good thing.
 
Joe Z.
 
From: CurtisC via groups.io
Sent: Wednesday, April 29, 2020 3:59 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Mach1 CP3 pier crash!! (Similar to CP4 crash in another thread)
 
I have an observatory.  The Pyramid ordinarily doesn't get very hot.  I tested its output voltage this evening, and it tested at 13.8.  So it came back after appearing dead.  Meanwhile, the little Radio Shack p.s. is connected to the CP3.

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