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®
International Inc. 561-8 Plate Drive, East Dundee, Illinois 60118-2467 USA
transistor is working properly, there should only be a few volts present at most. If not, return the drive to the
factory for repair.
4. On a hoist, this trip may indicate that the load brake is slipping excessively or that it has failed completely.
Examine the load brake and make any adjustments or repairs as necessary.
F3 (MMX or MMV
™
models): Low Bus Voltage
Code Meaning: The voltage across the main buss capacitors has dropped below a preset level while the drive is running.
This could indicate fluctuating input power.
Further Information/Troubleshooting Tips:
If you are seeing this trip, it might be beneficial to measure or record the line power coming in, since fluctuating line
power is usually the cause. If voltage fluctuation is happening too quickly to measure with a standard DMM, a recording
meter may be necessary. By default, you will only see this trip if the line power drops below approximately 80% of the
expected line power for an extended length of time.
What troubleshooting steps should I perform if I see F4?
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:
1. 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.
2. 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).
3. 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.
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