Operation panel
indication
Name
Internal fan alarm (IP55 compatible models only)
Description
FN2 appears on the operation panel when the internal air circulation fan stops due to a fault or low rotation speed.
Check point
Check the internal air circulation fan for a failure.
Corrective action
The fan may be faulty. Contact your sales representative.
Fault
When a protective function is activated, the inverter output is shut off and a Fault signal is output.
Operation panel
indication
Name
Overcurrent trip during acceleration
When the inverter output current reaches or exceeds approximately 235%
Description
acceleration, the protection circuit is activated and the inverter output is shut off.
• Check for sudden speed acceleration.
• Check if the downward acceleration time is too long in a lift application.
• Check for output short-circuit.
• Check that the Pr.3 Base frequency setting is not 60 Hz when the motor rated frequency is 50 Hz.
• Check if the stall prevention operation level is set too high. Check if the fast-response current limit operation is
disabled.
• Check that the regenerative driving is not performed frequently. (Check if the output voltage becomes larger
than the V/F reference voltage at regenerative driving and overcurrent occurs due to increase in the motor
Check point
current.)
• Check that the power supply for RS-485 terminal is not shorted (under Vector control).
• Check that the encoder wiring and the specifications (encoder power supply, resolution, differential/
complementary) are correct. Check also that the motor wiring (U, V, W) is correct (under Vector control).
• Check that the rotation direction is not switched from forward to reverse rotation (or from reverse to forward)
during torque control under Real sensorless vector control.
• Check that the inverter capacity matches with the motor capacity. (PM sensorless vector control)
• Check if a start command is given to the inverter while the motor is coasting. (PM sensorless vector control)
• Set the acceleration time longer. (Shorten the downward acceleration time of the lift.)
• If "E.OC1" always appears at start, disconnect the motor once and restart the inverter. If "E.OC1" still appears,
contact your sales representative.
• Check the wiring to make sure that output short circuit does not occur.
• Set 50 Hz in Pr.3 Base frequency. (Refer to
• Lower the stall prevention operation level. Activate the fast-response current limit operation. (Refer to
409.)
• Set the base voltage (rated voltage of the motor, etc.) in Pr.19 Base frequency voltage. (Refer to
Corrective action
• Check RS-485 terminal connection (under Vector control).
• Check the wiring and specifications of the encoder and the motor. Perform the setting according to the
specifications of the encoder and the motor (under vector control). (Refer to
• Prevent the motor from switching the rotation direction from forward to reverse (or from reverse to forward)
during torque control under Real sensorless vector control.
• Choose inverter and motor capacities that match. (PM sensorless vector control)
• Input a start command after the motor stops. Alternatively, use the automatic restart after instantaneous power
failure/flying start function. (Refer to
*1
Differs according to ratings. The rating can be changed using Pr.570 Multiple rating setting. (Refer to
148% for SLD rating,170% for LD rating, 235% for ND rating (initial setting), and 280% for HD rating
FN2
E.OC1
page
FR-LU08 indication FN2
Overcurrent trip during
FR-LU08 indication
acceleration
*1
page
673.)
604.) (PM sensorless vector control)
6.5 Causes and corrective actions
of the rated current during
page
page
673.)
page
86.)
page
326.)
6. PROTECTIVE FUNCTIONS
1
2
3
4
5
6
7
8
9
10
751