F4 (All Drives): Low Bus Voltage
Code Meaning: The voltage across the main buss capacitors has dropped below a preset level. This fault is a normal occurrence every time power is removed from the device. This fault is not saved in the diagnostic memory E1-E4 since the drive will not operate while displaying F4 as long as the low voltage condition persists. This also saves the memory E1-E4 for other, more severe fault codes. This means that an F4 code is a normal occurrence and typically does not suggest a problem on its own. Check the diagnostic memory locations E1-E4 for other event codes if further troubleshooting is necessary.
Further Information/Troubleshooting Tips:
Q1: Are you seeing this trip NOT while powering down, but while trying to run normally? If Yes, then check the following potential causes:
- The Line Voltage is too low. If your drive has just been installed and this fault is displayed, the unit is probably set for use with a higher 3-phase line voltage than that to which it is presently wired.
- If you are seeing an F4 code just prior to moving, there may be a problem with your mainline power (check that your mainline contactor is closing properly on all three phases).
- Damage to the drive. In this event the F4 fault code will always be displayed every time the unit it powered up. Contact PE® for repair/replacement options.
Call PE® for further assistance if needed.