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Mitsubishi Electric FR-E500 Instruction Manual Page 181

Fr-e500 series transistorized inverter.
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Operation Panel Indication
Name
Description
Check point
Corrective action
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 overcurrent protection.
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 meets load GD
• Decrease the braking duty.
• Use the brake unit or power return converter (FR-RC) as
required.
E. THM
Motor overload shut-off (electronic overcurrent protection)
(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 in 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 overcurrent protection)
(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 overcurrent
protection 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.
165
PROTECTIVE FUNCTIONS
FR-PU04
OV During Dec
2
)
FR-PU04
Motor Overload
FR-PU04
Inv. Overload

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