Fuji Electric FRENIC-AQUA series, User Manual

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[ 13 ] OL1 Overload of motor 1
Problem Electronic thermal protection for motor activated.
Possible Causes What to Check and Suggested Measures
(1) The electronic thermal
characteristics do not match the
motor overload characteristics.
Check the motor characteristics.
Î Reconsider the data of function codes (P99, F10 and F12).
Î Use an external thermal relay.
(2) Activation level for the
electronic thermal protection
was inadequate.
Check the continuous allowable current of the motor.
Î
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 for the load and the
acceleration/deceleration time.
Î Increase the acceleration/ deceleration time (F07, F08, E10
through E15, and H56).
(4) Overload. Measure the output current.
Î 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.
Î If no stall occurs, decrease the F09 data.
[ 14 ] OLU Inverter overload
Problem Temperature inside inverter has risen abnormally.
Possible Causes What to Check and Suggested Measures
(1) Temperature around the inverter
exceeded the inverter's
specification range.
Measure the temperature around the inverter.
Î Lower the temperature (e.g., ventilate the panel where the inverter
is mounted).
(2) Excessive torque boost specified
(F09)
Check whether decreasing the torque boost (F09) does not stall the
motor.
Î If no stall occurs, decrease the F09 data.
(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 for the load and the
acceleration/deceleration time.
Î Increase the acceleration/deceleration time (F07, F08, E10
through E15, and H56).
(4) Overload. Measure the output current.
Î 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.).
Î Decrease the motor sound (Carrier frequency) (F26).
If the carrier frequency is high, output must be reduced. For
details, refer to “2.6 Derating of Rated Output Current.”
Î Enable overload prevention control (H70).
Check if there is sufficient clearance around the inverter.
Î Change the mounting place to ensure the clearance.
(5) Ventilation paths are blocked.
Check if the heat sink is not clogged.
Î Clean the heat sink.