Quote Originally Posted by dachopper View Post
I experimented again with the power supply and g540 , thismorning.

My other power supply, is only 30 Volt max 10 amps, but I can see the current draw on the system was down around 2-3 amps ( don't know how accurate that is ) I could not get the fault with the other system.

I then tried the keeling 48 volt 12.5 amp
with voltmeter on the output, it was steady but faulted at 48 volts, I adjusted the voltage pot to 49.9 volts, again stable, the multimeter coult not detect movement, but the fault happened faster at 50 volts, I dropped voltage to 46 volts, and faulted after 5 minute, then I tried 44 volts, and it took lots of simultaneous input, but it eventually gave a fault at 44 volts, I wound the pot all the way back, so it's now at 42.5 volts, and there was no fault so far.

sound like there is a feedback issue coming from somewhere?

Is there anything I can do to try make it work at 48 / 50 volts
Provided you're remaining below the maximum voltage of the gecko drives, and allowing a reasonable safety margin, it should make no difference.

I can't remember, but are there any LEDs on the G540 to let you know any statuses?

I'd suggest temporarily disabling the chargepump input on the G540, and see if fault still occurs. It could be a noise issue that with the higher power, the G540 isn't seeing a good charge pump signal, so it is disabling all the drives. However if that was the case, I would expect problems with the step/dir signals aswell, however that probably wouldn't be noticeable if you're not actually working the machine to notice a position loss.