G540 - 4 motor connection problem

**dachopper** · 03-02-2017

Originally Posted by m_c

Ignoring Voltage/Power supply discussions, what is the actual fault you are seeing?

Do the motors stop/stall, the drives fault out...?

It's reading the CNC code, then the Gecko unit fault light somes on and that disabled everything

Is seems to happen a lot more - the higher the voltage I set on the switch mode power supply, I thought I had it working on the 42Volt setting, which is the lowest possible, but it stopped 3-4 times around the same area in the workpiece today

I tried to re-do it at slow speed, with slower accelerations and it still stopped - it's not jamming, it's running at about 30% of the jamming speed, it's being turned off because Gecko is giving a fault for some reason. the CNC program is still happily running in the background sending commands out

I switched over to another lower 30 Volt switched power supply that is also half the power ( 300 Watt ) , and I've had to slow down the motors and accelerations even more, as it's now almost half the efficient voltage I need. It seems to be getting through the job, although I had a few missed steps due to high loading at times during the cut sequence - so I've reduced the speed/accel even more

I don't know if it's a power problem, or a geckodrive current draw issue, or voltage issue - mystified

**m_c** · 03-02-2017

My guess is you have a noise problem, which is made worse by the higher voltage.

I've just had a quick scan of the G540 manual. How have you connected pin 10 and 12 on the G540? Have you tried connecting them with just a short bit wire?

The G540 uses 4 G250s internally, which don't have any form of fault output, so an individual axis fault should not cause the G540 fault light to come on.

**dachopper** · 03-02-2017

Originally Posted by m_c

My guess is you have a noise problem, which is made worse by the higher voltage.

I've just had a quick scan of the G540 manual. How have you connected pin 10 and 12 on the G540? Have you tried connecting them with just a short bit wire?

The G540 uses 4 G250s internally, which don't have any form of fault output, so an individual axis fault should not cause the G540 fault light to come on.

I've got a wire - about 2 foot long which is connecting them both together, I'll have a go - and shorten it right up, but I doubt this is the issue, then again, the + and _ wires run right next to this wire at the G540 box. -I heard there was some form of overvoltage protection, so I assumed that was what was faulting.

Wow - I just found this thread..

Guy has exactly the same motors as me, and the same fault.

http://www.cnczone.com/forums/gecko-...connected.html