Protective functions
Causes and corrective actions
FR-A800
6 - 19
Operation panel
indication
E.OC2
FR-LU-08
OC During Cnst Spd
Name
Overcurrent trip during constant speed
Description
When the inverter output current reaches or exceeds approximately 235%
of the rated current
during constant-speed operation, the protection circuit is activated and the inverter trips.
Check point
앫
Check for sudden load change.
앫
Check for output short-circuit.
앫
Check if the stall prevention operation level is set too high. Check if the fast-response
current limit operation is disabled.
앫
Check that the power supply for RS-485 terminal is not shorted (under vector control).
앫
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.
앫
Check that the inverter capacity matches with the motor capacity.
(PM sensorless vector control)
앫
Check if a start command is given to the inverter while the motor is coasting.
(PM sensorless vector control)
Corrective action
앫
Keep the load stable.
앫
Check the wiring to make sure that output short circuit does not occur.
앫
Lower the stall prevention operation level. Activate the fast-response current limit
operation.
(Refer to page 5-84.)
앫
Check RS-485 terminal connection (under vector control).
앫
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.
앫
Choose inverter and motor capacities that match. (PM sensorless vector control)
앫
Input a start command after the motor stops. Alternatively, use the automatic restart after
instantaneous power failure/flying start function. (Refer to page 5-571.)
(PM sensorless vector control)
Differs according to ratings. The rating can be changed using Pr. 570 "Multiple rating setting". (Refer to page 5-201.)
148% for SLD rating,170% for LD rating, 235% for ND rating (initial setting), and 280% for HD rating
Summary of Contents for FR-A800
Page 2: ......
Page 4: ......
Page 22: ...Contents XVIII ...
Page 30: ...Related manuals Introduction 1 8 ...
Page 122: ...Connection of stand alone option units Installation and wiring 2 92 ...
Page 180: ...Basic operation procedure JOG operation Basic operation 4 32 ...
Page 934: ...Check first when you have a trouble Protective functions 6 46 ...
Page 1031: ...Appendix EC Declarations of Conformity FR A800 A 47 ...
Page 1032: ...EC Declarations of Conformity Appendix A 48 ...
Page 1033: ...Appendix EC Declarations of Conformity FR A800 A 49 ...
Page 1034: ...EC Declarations of Conformity Appendix A 50 ...
Page 1035: ...Appendix EC Declarations of Conformity FR A800 A 51 A 5 2 EMC Directive ...
Page 1036: ...EC Declarations of Conformity Appendix A 52 ...
Page 1037: ...Appendix EC Declarations of Conformity FR A800 A 53 ...
Page 1038: ...EC Declarations of Conformity Appendix A 54 ...
Page 1039: ...Appendix EC Declarations of Conformity FR A800 A 55 ...
Page 1040: ...EC Declarations of Conformity Appendix A 56 ...
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