Mitsubishi Electric FR-E720-0.1K(SC) Instruction Manual page 346

Operation
panel
indication
Name
Regenerative overvoltage trip during constant speed
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
Description
the inverter output. The circuit may also be activated by a surge voltage
produced in the power supply system.
 Check for sudden load change.
 Check that the setting of Pr. 22 Stall prevention operation level is not too small.
Check point
 Check if the stall prevention operation is frequently activated in an
 Keep load stable.
 Check that regeneration avoidance function (Pr. 882, Pr. 883, Pr. 885, Pr. 886)
Corrective
 Use the brake resistor, brake unit or power regeneration common converter
action
 Set the Pr.22 Stall prevention operation level correctly.
 Set Pr.154 Voltage reduction selection during stall prevention operation = "11".
Operation
panel
indication
Name
Regenerative overvoltage trip during deceleration or stop
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
Description
the inverter output. The circuit may also be activated by a surge voltage
produced in the power supply system.
 Check for sudden speed reduction
Check point
 Check if the stall prevention operation is frequently activated in an
 Increase the deceleration time. (Set the deceleration time which matches the
 Longer the brake cycle.
Corrective
 Use regeneration avoidance function (Pr. 882, Pr. 883, Pr. 885, Pr. 886).
action
 Use the brake resistor, brake unit or power regeneration common converter
 Set Pr.154 Voltage reduction selection during stall prevention operation = "11".
E.OV2
application with a large load inertia.
is used.
(FR-CV) as required.
E.OV3
application with a large load inertia.
moment of inertia of the load)
(FR-CV) as required.
FR-PU04
FR-PU07
FR-PU04
FR-PU07
2/4
Stedy Spd OV
OV During Dec
BCN-C22005-679