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© Copyright 2016 Power Electronics
®
International Inc. 561-8 Plate Drive, East Dundee, Illinois 60118-2467 USA
What troubleshooting steps should I perform if I see F2?
F2 (All Drives ver. 2.2 or 4.2 or higher): Motor Thermal Trip/I^2T Trip
Code Meaning: I^2T Current Trip – the motor temperature is beyond rated capacity. The unit will reset after the motor
has time to cool off.
Further Information/Troubleshooting Tips:
Unlike most other event codes, the F2 code cannot be manually cleared by resetting the drive or turning the power to
the drive off then on. The drive needs to be powered on while the motor is cooling off – this way the drive will calculate
how much time has passed in order to let the motors cool off properly. After some time has passed with the drive on, try
clearing the F-code as usual.
If you feel the drive is tripping with F2 codes unnecessarily (nuisance trip), check the following:
1. Verify that the proper FLA of your motors/group of motors has been entered into the U22 setting.
2. Check if your motor is rated for 120 Hz. If it is, call PE
®
for information about changing the drive parameters to
work properly with a 120Hz motor.
3. Check that your Voltage boost setting (A8) is not set too high.
4. Holding the increase button while your drive is running will show you the current draw of the motors. If you see
that the current draw is high, check to see if there are any sources of binding (E.g. Verify that your brakes are
not dragging, or that there is any other source of mechanical binding).
NOTE: On some older MX/MV drives, an F2 code was used to signify a Weight Limit Trip (over torque). On newer drives,
this code has been changed to F27. If you have older MX/MV drive model, see What troubleshooting steps should I
perform if I see F27? for more information.
Call PE
®
for further assistance if needed.
What troubleshooting steps should I perform if I see F3?
F3 (MSM or CX models): Braking Resistor On Too Long
Code Meaning: The braking resistor has been on too long.
Further Information/Troubleshooting Tips:
1. The resistance of the external resistor may be too large. The resistance is considered too large if it more than
110% of the value determined by PE
®
(especially applicable if you not using the recommended PE
®
resistor bank).
If this is the case, replace the resistor with one that agrees with the specification. Never use a resistor that has
fewer ohms than the specification requires!
2. The line voltage is too high. Make sure that the incoming line voltage is within specifications.
3. A transistor may be shorted in the drive. To check this, detach the motor and run the drive at some speed. While
running, check the DC voltage across the open resistor (CAUTION: As much as 800 volts may be present!) If the
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