output phase loss

[ganutenator]

The Toshiba vfd that I am using defaults to output phase loss monitoring disabled.
If I turn it on, then it is one of the faults that don't auto reset.
Even turning the drive off and back on again doesn't clear the fault.
You have to hit the clear button twice.
I can write code to read the fault via modbus and clear the fault.

The questions:
Is the juice worth the squeeze?

How bad is output phase loss?
I know what it makes the motor sound like.

 

[JeremyM]

That’s been a default for other drives I’ve worked with.

If you’re already resetting other manually cleared faults, why not?

 

[ganutenator]

 2:SlaveAddr:= dswa_VSD_modbus_address;
		FunctionCode:= 6;
		IF (DsTrolleyVfdType = 0) THEN
		  Write_Address:= 8602;
		  WriteData[0]:= dswa_write_speed_rpm;
		ELSIF (DsTrolleyVfdType = 1) THEN
			IF DswaDriveFlt THEN
				Write_Address:= 16#FA00;
				WriteData[0]:= 16#2000;
			ELSE
		 		Write_Address:= 16#FA01; (*Hz*)
		  		dswa_write_speed_rpm_real:= INT_TO_REAL(dswa_write_speed_rpm);
		  		WriteData[0]:= REAL_TO_INT((dswa_write_speed_rpm_real / 30.0) * 100.0);
			END_IF;
		END_IF;

 

[BryanG]

I would be wanting to find and fix the problem that is causing the drive to fault on an output phase loss. Running a drive with one phase down it will obviously not be able to give out it's rated power. This isn't something I would work round, I would want it fixed.


https://joliettech.com/blog/typical...d-how-to-troubleshoot-them-output-phase-loss/


https://www.electricaltechnology.or...ase-motor-when-1-out-of-3-phases-is-lost.html