stf and stop on at same time

[stanwich 0]

i have a 800 series vfd drive that when trying to start has the STF function and stop on at the same time, does this sound like a plc issue or a wiring issue?

Edited 24 Nov 2019 by stanwich
spelling error

[MarkusR 0]

Could be PLC, could be wiring, could be VFD Setup.

Hard to tell from these few Information.

Basically what do you describe sounds to me like you trying to start the VFD but the VFD is somehow in stop.

Some sort of interlock is active.

Anyways, I would check MRS terminal and MRS configuration.

Check Parameter 17 and Parameter 187.

Also check if Parameter 19 (Base Voltage) is set.

[stanwich 0]

Thanks for the reply!, It seems to look internal, The stf turns on but it seems like internal run relay is not closing to complete the circuit,  , we dont use the mrs terminal and just for shits and giggles i jumpered it out with sd and it made no diff, The stop just wont go away....grrrrrrrrr