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PROTECTIVE FUNCTIONS
165
Operation Panel Indication
E. THM
FR-PU04
Motor Overload
Name
Motor overload shut-off (electronic overcurrent protection)
(Note 1)
Description
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 point
Check the motor for use under overload.
Corrective action
•
Reduce the load weight.
•
For the constant-torque motor, change the Pr. 71 setting to
the constant-torque motor setting.
Operation Panel Indication
E. THT
FR-PU04
Inv. Overload
Name
Inverter overload shut-off (electronic overcurrent protection)
(Note 1)
Description
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 point
Check the motor for use under overload.
Corrective action
Reduce the load weight.
Note:1 Resetting the inverter initializes the internal heat integrating data of the
electronic overcurrent protection.
Operation Panel Indication
E. FIN
FR-PU04
H/Sink O/Temp
Name
Fin overheat
Description
If the cooling fin overheats, the overheat sensor is actuated
to stop the inverter output.
Check point
•
Check for too high ambient temperature.
•
Check for cooling fin clogging.
Corrective action
Set the ambient temperature to within the specifications.