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Errors (Alarms)
PROTECTIVE FUNCTIONS
6
*1. Resetting the inverter initializes the internal heat integrating data of the electronic
overcurrent protection.
Operation Panel
Indication
THM FR-PU04 Motor Overload
Name Motor overload shut-off (electronic thermal overcurrent protection) (*1)
Description
The electronic overcurrent protection in the inverter detects motor overheat
due to overload or reduced cooling capability during low-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.
Protection from burning due to motor temperature rise
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.
Error code H31
Operation Panel
Indication
THT FR-PU04 Inv. Overload
Name Inverter overload shut-off (electronic thermal overcurrent protection) (*1)
Description
If a current not less than 150% of the rated output current flows and
overcurrent cut-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.
Output transistor protection from overheat
Check point Check the motor for use under overload.
Corrective action Reduce the load weight.
Error code H30
Operation Panel
Indication
FIN FR-PU04 H/Sink O/Temp
Name Fin overheat
Description
If the cooling heatsink overheats, the overheat sensor is actuated to stop the
inverter output.
Check point
• Check for too high ambient temperature.
• Check for cooling heatsink clogging.
• Check that the cooling fan is not at a stop.
Corrective action
Set the ambient temperature to within the specifications.
Change the cooling fan.
Error code
H40
Operation Panel
Indication
GF FR-PU04 Ground Fault
Name Start-time ground fault overcurrent protection
Description
This function stops the inverter output if a ground fault overcurrent flows
due to a ground fault that occurred in the inverter's output (load) side.
Made valid when Pr. 40 "start-time ground fault detection selection" = "1".
Check point Check for a ground fault in the motor and connection cable.
Corrective action Remedy the ground fault portion.
Error code H80