Power Electronics VFD - F5: Over Voltage Trip

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International Inc. 561-8 Plate Drive, East Dundee, Illinois 60118-2467 USA

What troubleshooting steps should I perform if I see F5?

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

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.

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