Centroid Community CNC Support Forum

Chuck,
When using the PLC, it looks like power is cut off to the VFD when the E-Stop is pushed and that the PLC restores power to the VFD when the E-Stop is released. Is that what happens? If also looks like power is not cut off to the VFD when the E-Stop is pushed and when the PLC is not being used. Is that correct?

The reason that I'm asking is that the manual states that the fault condition must be removed before sending the fault reset signal. Powering off the VFD would clear the fault. Simply releasing the E-Stop might not qualify as removing the fault condition.

I think that Marty released a video recently that shows how he uses signals from the VFD to show that it is working properly and how he resets the VFD.

Mike Richards,
That is essentially correct, my E-stop has two N.C. contacts, one goes directly to the Acorn the other to the PLC. Pushing the E-Stop sends a signal to Input #8 on the Acorn. The other contact goes to the PLC which provides an external fault to the VFD. The PLC keeps the VFD and Drive power off until the E-Stop is reset, the Start button is pressed and 10 seconds pass before restoring power to the VFD and Drives.

Relay #6 energizes immediately when the E-Stop is pressed and De-energizes when the E-Stop is reset. This appears without any observable delay. If I get some time I can try to setup a signal monitor that will show the timing between the E-Stop, Spindle Fault, and Relay #6 operation.

I guess the question seems to be is when / how does the Acorn send the Reset signal (Relay #6 in my case)? It seems to send it when the E-Stop is pressed (at least that is what I am seeing) not when I press the Red Reset on the VCP.
Chuck

The VCP reset and the Estop are not the same thing. They do not function the same way.
You are correct, when you cycle the physical Estop, that should cycle the relay (output 6 in your case) to reset the drive.

Marty

Marty, thanks for the information. Cycling the E-Stop was the only way that I could think to induce a VFD Fault (external fault) to test my setup. My lathe is similar to MecTechMike's and I was trying to verify an issue that he was seeing.

Other than the E-Stop what causes a rest to be sent? oK/Reset Button on the VCP? I have not seen Relay #6 energize except for when the E-Stop is pressed.
Chuck

The red reset button on the VCP is not an Estop, it is a CNC SOFTWARE reset button.

only a physical Estop button is the one and only real Estop.

software reset will cycle the nofaultout output, but will not cycle the Drive reset or VFD reset output

the physical Estop button will cycle the Drive reset or VFD reset output

this is the stock setup in the PLC program. (if you really want something different you can edit the PLC program to do what ever you want)

Folks,

Many thanks for the input. In an attempt to isolate the problem, I assigned VFDReset to an unused relay. I do not see or hear the relay pulse when coming out of fault. So I don't think the VFD has anything to do with my current situation. Report file enclosed.

Thanks,
Mike

MecTechMike wrote: ↑Thu Feb 06, 2020 11:38 pm Folks,

Many thanks for the input. In an attempt to isolate the problem, I assigned VFDReset to an unused relay. I do not see or hear the relay pulse when coming out of fault. So I don't think the VFD has anything to do with my current situation. Report file enclosed.

Thanks,
Mike

Mike,
I loaded your report. Cycling the PHYSICAL Estop button does cycle your Drive Reset and your VFD Reset outputs.
VCP reset DOES NOT and will not.

Marty

Thanks Marty for looking at this. I was mistaken about the event that triggers these outputs.

Mike

All resolved?