Re: Servo Drive Issues - Not many Caps

The drive display shows "d" when powered up with setpoint of zero, and "E" with any non-zero setpoint. It's a single character display.
According to the manual, "d" is "bus voltage not present." "E" is "Enabled, bus voltage present."

Re: Servo Drive Issues - Not many Caps



I tested the leads mentioned in both diode-test mode and resistance/continuity with my DMM. The component is still on the PCB, PCB is not powered, shorted gates to emitters prior to testing. Here's what I got:

Diode Mode:
K --> R (0.552V/"OL"), S (0.552V/"OL"), & T (0.552V/"OL")
R (0.552V/"OL"), S (0.552V/"OL") & T (0.552V/"OL") --> A
U (0.429V/"OL"), V (0.428V/"OL"), & W (0.429V/"OL")...

Re: Servo Drive Issues - Not many Caps

I have not checked diode integrity. I am a newb. Can you advise on that procedure?

Having trouble with an API Controls brushless servo drive; drive does not properly control motor, rather, motor just stutters and hums rather than rotating smoothly. Have positively tested the motors against working drives. There look to be only a few caps and some other diodey type things. The tall cylindrical caps are not bulging but might be a little less than perpendicular to the plane of the PCB. No juices or sauce exploding from any of the caps either. Anything look funky to you professionals out there? Many thanks in advance....

Re: New Members - please post your introductions here

Greetings,
I'm a chemist, out of my depth troubleshooting a servo drive. A friend of mine told me about this forum so I figured I'd give it a go. From the looks of it, all electronic failures are from bad caps!