Mitsubishi Electric fr-e700 series, Instruction Manual

Page: 538 / 608

Causes and corrective actions Troubleshooting
7 - 10
Operation panel
indication
E.OV1
FR-PU04
FR-PU07
OV During Acc
Name Regenerative over voltage shutoff during acceleration
Description
If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed
the specified value, the protective circuit is activated and the inverter trips. The circuit may also
be activated by a surge voltage produced in the power supply system.
Check point
1) Check for too slow acceleration (e.g. during downward acceleration in vertical lift load).
2) Check that the Pr. 22 "Stall prevention operation level" is not too low.
Corrective action
1)
쐌
Decrease the acceleration time.
쐌
Check that regeneration avoidance function (Pr. 882, Pr. 883, Pr. 885, Pr. 886) is used.
(Refer to section 6.20.4)
2) Set a correct value in Pr. 22 "Stall prevention operation level".
Operation panel
indication
E.OV2
FR-PU04
FR-PU07
U>>N = konst
Name Regenerative over voltage shut-off during constant speed
Description
If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed
the specified value, the protective 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
1) Check for sudden load change.
2) Check that the Pr. 22 "Stall prevention operation level" is not too low.
Corrective action
1)
쐌
Keep load stable.
쐌
Check that regeneration avoidance function (Pr. 882, Pr. 883, Pr. 885, Pr. 886) is used.
(Refer to section 6.20.4)
쐌
Use the brake resistor, brake unit or power regeneration common converter (FR-CV)
as required.
2) Set a correct value in Pr. 22 "Stall prevention operation level".
Operation panel
indication
E.OV3
FR-PU04
FR-PU07
OV During Dec
Name Regenerative over voltage shut-off during deceleration or stop
Description
If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed
the specified value, the protective 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 Check for sudden speed reduction.
Corrective action
앫
Increase the deceleration time. (Set the deceleration time which matches the inertia
moment of the load)
앫
Use regeneration avoidance function (Pr. 882, Pr. 883, Pr. 885, Pr. 886). (Refer to section
6.20.4.)
앫
Use the brake unit or power regeneration common converter (FR-CV) as required.