Tightmopedman9
Plastic
- Joined
- Dec 6, 2016
Machine hadn't been powered on for 6 months, when I went to inspect it the owner turned on his RPC and about 2 minutes after the machine turned on, before being homed, the RPC almost stalled due to excessive power consumption. The owner claimed it worked up to that point.
Now the mill is in my shop and I've narrowed down the problem to the power supply for the servo amps (probably). I can get the machine to boot and pass all tests, but I can't get any axis to move.
With the VFD monitoring current and the power supply connected it will draw up to 15A, at which point my VFD faults due to overcurrent, no fuse is blown. If I disconnect either the 70 or 90 VAC input lines the drive won't fault; keeping the 70VAC line connected I get 1.8A load, 90 VAC is 3.2A.
I attached two relevant wiring diagrams and a picture of the circuit. Disconnecting line 214, 215 or 2 will prevent the fault. 215 is tied to 252 via a thermistor, 215 isn't actually connected to anything else, same story with 251 to 214.
I've disconnected every output from the power supply with no luck. Values aren't specified for any of the components, and I'm not familiar with the circuit, so I'm not sure what an acceptable range should be for the resistor, I measured it at .6ohms.
I'd like to get the machine running for testing purposes. I plan to convert it to LinuxCNC, so I'd like to make sure at least the servos are functional, and if possible, reuse the servo amps.
Now the mill is in my shop and I've narrowed down the problem to the power supply for the servo amps (probably). I can get the machine to boot and pass all tests, but I can't get any axis to move.
With the VFD monitoring current and the power supply connected it will draw up to 15A, at which point my VFD faults due to overcurrent, no fuse is blown. If I disconnect either the 70 or 90 VAC input lines the drive won't fault; keeping the 70VAC line connected I get 1.8A load, 90 VAC is 3.2A.
I attached two relevant wiring diagrams and a picture of the circuit. Disconnecting line 214, 215 or 2 will prevent the fault. 215 is tied to 252 via a thermistor, 215 isn't actually connected to anything else, same story with 251 to 214.
I've disconnected every output from the power supply with no luck. Values aren't specified for any of the components, and I'm not familiar with the circuit, so I'm not sure what an acceptable range should be for the resistor, I measured it at .6ohms.
I'd like to get the machine running for testing purposes. I plan to convert it to LinuxCNC, so I'd like to make sure at least the servos are functional, and if possible, reuse the servo amps.