Powerflex 40P VFD - Opto output parameter
Powerflex 40P VFD - Opto output parameter
(OP)
I am using Powerflex 40P drive. I tied the opto output on the VFD terminal (pin 18) to PLC input. I used Drive explorer software to set the VFD parameter A061 (Opto Output selection) = "Motor Running". But when the motor is running, I don't see this output turn ON. Any ideas why? See attached picture.
Sriram
Sriram





RE: Powerflex 40P VFD - Opto output parameter
Look carefully at the wiring diagram for the PowerFlex 40P and you'll see that the Opto outputs are usually used to run a brake relay and that +24V is applied to the "Output" pins 17 or 18, and DC common is connected to the Opto Common pin.
Your PLC input needs to be a "sourcing" type to use it with the PowerFlex 40P opto outputs.
This is based only on my reading of the publications; I have not made such a connection myself.
RE: Powerflex 40P VFD - Opto output parameter
RE: Powerflex 40P VFD - Opto output parameter
This is illustrated in the Control Wiring Block Diagram on page 1-15 of the PowerFlex 40P User Manual, Publication 22D-UM001.
As far as I can tell, the Opto Outputs are always a "Sinking Output", so if hooked to a PLC they would require a "Sourcing Input".
An interposing relay would be a simple way to work around this issue if you have only Sinking Inputs available.