Mitsubishi Electric FR-E560 Series Instruction Manual page 178

Operation Panel Indication
Name
Description
Check point
Corrective action
I
Operation Panel Indication
Name
Description
Check point
Corrective action
Operation Panel Indication
Name
Description
Check point
Corrective action
Note:1. Resetting the inverter initializes the internal heat integrating data of the
electronic thermal relay function.
E. OV3
Regenerative overvoltage shut-off 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 the inverter output.
It may also be activated by a surge voltage generated in the
power supply system.
Check for sudden speed reduction.
• Increase the deceleration time. (Set the deceleration time
which matches the moment of inertia of the load)
• Decrease the braking duty.
E. THM
Motor overload shut-off (electronic thermal relay function)
(Note 1)
The electronic overcurrent protection in the inverter detects
motor overheat due to overload or reduced cooling capability
during constant-speed operation to stop the inverter output.
When a multi-pole motor or two or more motors are run,
provide a thermal relay on the output side of the inverter.
Check the motor for use under overload.
• Reduce the load weight.
• For the constant-torque motor, change the Pr. 71 setting to
the constant-torque motor setting.
E. THT
Inverter overload shut-off (electronic thermal relay function)
(Note 1)
If a current of more than 150% of the rated output current
flows and overcurrent shut-off does not occur (200% or less),
inverse-time characteristics cause the electronic thermal relay
function to be activated to stop the inverter output in order to
protect the output transistors.
Check the motor for use under overload.
Reduce the load weight.
168
PROTECTIVE FUNCTIONS
FR-PU04 OV During Dec
FR-PU04 Motor Overload
FR-PU04 Inv. Overload