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F5 Code Help – Over Voltage

F5 (All Drives): Over Voltage Trip

Code Meaning: The voltage across the main buss capacitors has increased above a preset level.

Further Information/Troubleshooting Tips:

Q1: When does this trip happen? Look for the appropriate answer to this question in bold below and follow the respective troubleshooting steps as necessary.

  1. If the drive has just been installed and the fault is displayed: The supplied voltage may be too high. Supply the correct line voltage or replace the misapplied drive with a proper voltage drive.
  2. If the trip happens when accelerating or as it goes into a higher frequency: Make sure that your motor is the correct Hz. If your motor is rated for something other than 60 Hz, call PE® for information about changing the drive parameters to work properly with your motor.
  3. If the trip happens when decelerating or while trying to ramp down from a high speed: This scenario often indicates that A) the drive is decelerating too fast. Solution: Increase the deceleration time between speeds at A4, increase the time for decelerating to a stop (A5), and increase the time for decelerating when reverse-plugging (A6). You may only need to increase the deceleration time that is the shortest out of the values at A4-A6 to get the drive to function properly. It is usually easier to start by increasing both A5 and A6 incrementally and then gradually increasing A4 to get proper operation. If the deceleration rates are already fairly high, and you continue to see the F5 code when decelerating, this may point to B) a problem with the braking resistors – either they have gone bad, are not hooked up properly, or they may not be sufficient for your application. Call PE® for further help with appropriate regeneration resistor sizing.
  4. If the trip happens at low speeds, or while “inching”: An F5 trip can be caused by load swing. Solution: Lower your accel/decel rates into and from your low speeds to help reduce load swing. In this situation, another possible cause is if the drive is starting into a moving motor. Solution: Make sure the motor has stopped before it is allowed to power the motor, such as restarting a hoist in the down direction before the hoist has stopped from a previous down direction command.
  5. If your drive operates a hoist motor, and you see F5 while lowering a load: This scenario often indicates that the load brake is slipping too much, allowing regen into the drive. In this case, check to see if the load brake can be adjusted to reduce slippage. In some cases, adding a small regen. resistor can help as well. Call PE® for further help in this case.

If you have performed the above steps, and are still experiencing F5 codes, check if your incoming voltage is high. In this case, lowering your high speed setting and accel/decel rates may help avoid this trip.

Call PE® for further assistance if needed.