Here is a CGX problem that I have been experiencing with my DEC axis.
When the system is first powered up and after it has homed out on the switches.
During initial star alignment.
I drive the DEC and RA axis at the same time, at full speed to point at my 2nd or 3rd alignment star.
During this slew of BOTH axis , the DEC axis will usually experience a “runaway” condition .
It will accelerate at faster than speed 9 then slow down then accelerate again , repeating, for as long as the DEC and RA axis are being slewed.
So I figured its probably a motor encoder problem. No
I swapped the drive motors between the RA and DEC axis and the problem remained with the DEC axis. I have to assume from this that problem is not in the motor/encoder.
So maybe a AC power supply problem? No
I replaced the 110VAC power supply with my 12VDC battery power supply (Deep cycle ,400 ah boat battery) and the problem still occurs. So I have to assume this is not a problem with my AC power supply.
Looking back through the postings in this group I found this under “SOMETHING FOR CGX OWNERS”
A posting from Ed Thomas , Deep Space Products
" Posted 22 July 2020 - 01:52 PM
Based on what you have done already, it's most likely and motor encoder problem on the RA. An internal cable issue could also be the issue but it is much less likely."
In my case it seems to have been a INTERNAL cabling problem.
I opened up the access port located under the CGX carrying handle to check the cable bundle.
No cuts or bare wires but the cable seemed to be bunched up.
I worked on the bundle routing around the DEC axis , rotating the DEC head by hand until I was happy with how the cable was moving.
Problem has gone away.
I assume the cable was pulling on the connectors for certain motions and this caused the runaway motor actions.
Thanks ED for the clue on this.