Causes and corrective actions
Protective functions
6 - 22
Operation panel
indication
E.OV2
FR-LU-08
OV During Cnst Spd
Name
Regenerative overvoltage trip during constant speed
Description
If regenerative power causes the inverter's internal main circuit DC voltage to reach or exceed
the specified value, the protection circuit is activated to stop the inverter output. The circuit may
also be activated by a surge voltage produced in the power supply system.
Check point
앫
Check for sudden load change.
앫
Check that the Pr. 22 "Stall prevention operation level" is not set to the no load current or
lower.
앫
Check if the stall prevention operation is frequently activated in an application with a large
load inertia.
앫
Check that acceleration/deceleration time is not too short.
Corrective action
앫
Keep the load stable.
앫
Use the regeneration avoidance function (Pr. 882 to Pr. 886). (Refer to page 5-723.)
앫
Use the brake unit or power regeneration common converter (FR-CV) as required.
앫
Set a value larger than the no load current in Pr. 22.
앫
Set Pr. 154 "Voltage reduction selection during stall prevention operation" = "10, 11".
(Refer to page 5-325.)
앫
Set the acceleration/deceleration time longer. (Under vector control or Advanced magnetic
flux vector control, the output torque can be increased. However, sudden acceleration may
cause an overshoot in speed, resulting in an occurrence of overvoltage.)
Operation panel
indication
E.OV3
FR-LU-08
OV During Dec
Name
Regenerative overvoltage trip during deceleration or stop
Description
If regenerative power causes the inverter's internal main circuit DC voltage to reach or exceed
the specified value, the protection circuit is activated to stop the inverter output. The circuit may
also be activated by a surge voltage produced in the power supply system.
Check point
앫
Check for sudden speed reduction.
앫
Check if the stall prevention operation is frequently activated in an application with a large
load inertia.
Corrective action
앫
Set the deceleration time longer. (Set the deceleration time which matches the moment of
inertia of the load.)
앫
Make the brake cycle longer.
앫
Use the regeneration avoidance function (Pr. 882 to Pr. 886). (Refer to page 5-723.)
앫
Use the brake unit or power regeneration common converter (FR-CV) as required.
앫
Set Pr. 154 "Voltage reduction selection during stall prevention operation" = "10, 11".
(Refer to page 5-325.)
Summary of Contents for FR-A820-00046 (0.4K)
Page 2: ......
Page 4: ......
Page 144: ...System configuration for Ethernet communication FR A800 E Installation and wiring 2 114 ...
Page 202: ...Basic operation procedure JOG operation Basic operation 4 32 ...
Page 1090: ...Check first when you have a trouble Protective functions 6 50 ...
Page 1189: ...Appendix EC Declarations of Conformity FR A800 A 49 ...
Page 1190: ...EC Declarations of Conformity Appendix A 50 ...
Page 1191: ...Appendix EC Declarations of Conformity FR A800 A 51 ...
Page 1192: ...EC Declarations of Conformity Appendix A 52 ...
Page 1193: ...Appendix EC Declarations of Conformity FR A800 A 53 ...
Page 1194: ...EC Declarations of Conformity Appendix A 54 ...
Page 1195: ...Appendix EC Declarations of Conformity FR A800 A 55 ...
Page 1196: ...EC Declarations of Conformity Appendix A 56 ...
Page 1197: ...Appendix EC Declarations of Conformity FR A800 A 57 ...
Page 1198: ...EC Declarations of Conformity Appendix A 58 ...
Page 1199: ...Appendix EC Declarations of Conformity FR A800 A 59 ...
Page 1200: ...EC Declarations of Conformity Appendix A 60 ...
Page 1201: ...Appendix EC Declarations of Conformity FR A800 A 61 ...
Page 1202: ...EC Declarations of Conformity Appendix A 62 ...
Page 1203: ...Appendix EC Declarations of Conformity FR A800 A 63 ...
Page 1204: ...EC Declarations of Conformity Appendix A 64 ...
Page 1205: ...Appendix EC Declarations of Conformity FR A800 A 65 ...
Page 1206: ...EC Declarations of Conformity Appendix A 66 ...
Page 1207: ...Appendix EC Declarations of Conformity FR A800 A 67 ...
Page 1208: ...EC Declarations of Conformity Appendix A 68 ...
Page 1209: ...Appendix EC Declarations of Conformity FR A800 A 69 ...
Page 1210: ...EC Declarations of Conformity Appendix A 70 ...
Page 1211: ...Appendix EC Declarations of Conformity FR A800 A 71 ...
Page 1212: ...EC Declarations of Conformity Appendix A 72 A 7 2 FR A846 series ...
Page 1213: ...Appendix EC Declarations of Conformity FR A800 A 73 ...
Page 1214: ...EC Declarations of Conformity Appendix A 74 ...
Page 1215: ...Appendix EC Declarations of Conformity FR A800 A 75 ...
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