Fuji Electric FRENIC-Ace series, User Manual

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6.3 If an Alarm Code Appears on the LED Monitor
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Chap 6
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0ln
Motor overloads 1 to 2
Phenomena Electronic thermal function for motor overload detection of motors 1-2 worked.
0l1
Motor 1 overload
0l2 Motor 2 overload
Possible Causes Check and Measures
(1) The electronic thermal
characteristics do not match the
motor overload characteristics.
Check the motor characteristics.

Review the data of related function codes P99*, F10*, F12*.

Use an external thermal relay.
(2) Activation level for the
electronic thermal protection
was inadequate.
Check the continuous allowable current of the motor.

Reconsider and change the data of function code F11*.
(3) The specified acceleration/
deceleration time was too short.
Recalculate the acceleration/deceleration torque and time needed for
the load, based on the moment of inertia of the load and the
acceleration/deceleration times.

Increase the acceleration/deceleration times (F07, F08, E10 to E15,
and H56).
(4) Overload. Measure the inverter output current.

Reduce the load (e.g. Use the overload early warning (E34) and
reduce the load before the overload protection is activated.). In
winter, the load tends to increase.
(5) Excessive torque boost
specified (F09*)
Check whether decreasing the torque boost (F09*) does not stall the
motor.

If no stall occurs, decrease the F09* data.