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What is the fault code PRA on ATV61 or ATV71 drives?



What is the fault code PRA on ATV61 or ATV71 drives? 

Product Line:
Altivar ATV61 ATV71


Drive status is showing PRA on the HMI display.

PRA is not a fault code.  It is a state of the drive.  It means that power removal function is active. The drive is not detecting 24Vdc on the PWR terminal.
Measure for 24Vdc between +24 to COM to verify the internal power supply. If you don't have 24Vdc present on the +24 terminal, measure DC voltage between PA+ and PC- to check your DC bus voltage.
Confirm that the factory installed jumper between +24 and PWR is solidly connected.  The jumper is removed if a safety circuit is installed.  Verify continuity of the safety circuit.

When the voltage on PWR is re-established, the drive status will return to RDY if there is not an active run command, or NST if a run command is active.  To clear NST, remove the run command.