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F14 Code Help – Output Phase Loss

F14 (MMX/MMV™ Only): Output Phase Loss

Code Meaning: This code will display if a line to the motor is lost or fusing opened between the motor and the drive. Also, a loose encoder coupling can cause the VFD to over-compensate. This may cause the current to fall so low as to appear to be a lost phase.

Further Information/Troubleshooting Tips:

  1. To verify the lines to the motor, check each line with a clamp meter to check for current while running. If one line is low or does not have current, test all connections and wires on that line. If the motor lines all test fine, check the encoder with the following steps.
  2. Check the encoder coupling. Make sure it is not loose and make sure the encoder does not tilt or wobble while the motor is being driven. Tighten couplings and brackets as necessary. If the physical elements of the encoder appear fine, check the wiring next.
  3. Measure the DC voltage from the drive to the encoder at 0V and V+. If no voltage can be measured there, remove the leads from those terminals and re-measure. If a voltage is present when no leads are connected, verify the wiring for your encoder and test again.
  4. If F14 is coming up only when going into high speed, check to see if your motor is a 60 Hz motor. If your motor is rated for something other than 60 Hz, call PE® for help with adjusting the necessary parameters.

Call PE® for further assistance.