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

Does an F1 occur when accelerating?

If yes, it may be that the motor is slipping so excessively that torque is not efficiently produced. In this case, it is

suggested to increase the acceleration time A1. If increasing the acceleration is unacceptable or does not work, try

increasing the voltage boost (A8/C74 on MX

™

drives). Increase it gradually in steps of about 0.5%. If raising the voltage

boost helped but didn’t completely solve the problem, try gradually lowering the voltage peak function (L21). Do not

lower the voltage peak function to less than 90% of its nominal rating. Recall that the nominal voltage peak setting is

(Incoming Line Voltage)x(full Hz of motor)/(Full motor voltage).

Does an F1 occur when decelerating?

If yes, then we suggest first observing whether the trip occurs when decelerating between speeds, decelerating to a

stop, or decelerating during a reverse plug condition. The three deceleration parameters A4, A5, and A6 govern these

three rates (respectively) and increasing the appropriate parameters may alleviate the problem. One could also set A5

and A6 to their maximum value and just increase A4 gradually to obtain a setting that will work. If increasing the time is

unacceptable or does not work, try changing the voltage boost A8.

Does F1 occur while travelling a constant speed, or when a certain speed is reached?

If yes, perform the following recommended steps:

1. If the fault occurs while the motor is running at a constant speed, then the load on the hook may be swinging.

Increasing the acceleration and deceleration times may also help reduce the swinging which may be causing

motor problems.

2. If the fault occurs when a certain speed (in Hz) is reached, verify that the drive is hooked up to the correct

windings on your motor (e.g. make sure if you have a 460V motor that you are not hooked up to the 230V

windings).

3. Verify that your motor is a 60Hz motor. If it is a 120 Hz motor (or some other frequency), contact PE

for

assistance with setting the output parameters correctly.

Does the drive ramp up in frequency, but the motor does not turn, and then an F1 occurs?

If yes, one should check the following potential sources:

1. Verify that any mechanical brake that is used is releasing cleanly.

2. Verify that there is no mechanical binding in the system

3. Verify that the motor is wired properly and not single-phasing.

If these check out, increasing the voltage boost A8 and voltage peak functions may help. Try changing the voltage boost

gradually by first increasing its value, and if that does not work then by decreasing. Then try lowering the voltage peak

function and see how the machine works. Do not lower the voltage peak function to less than 90% of its nominal rating.

Recall that the nominal voltage peak setting is (Incoming Line Voltage)x(full Hz of motor)/(Full motor voltage). Try

Power Electronics VFD User Manual

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