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171
Errors (Alarms)
3
PROTECTIVE FUNCTIONS
*1. Resetting the inverter initializes the internal thermal integrated data of the
electronic thermal relay function.
Operation Panel Indication
THM FR-PU04 Motor Ovrload
Name Motor overload shut-off (electronic thermal relay function) (* 1)
Description
The electronic thermal relay function 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 on
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 a constant-torque motor, set the constant-torque motor in Pr.
71 "applied motor".
Operation Panel Indication
THT FR-PU04 Inv. Overload
Name Inverter overload shut-off (electronic thermal relay function) (* 1)
Description
If a current of more than 120% of the rated output current flows
and overcurrent shut-off does not occur (150% 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.
Output transistor protection from overheat
Check point Check the motor for use under overload.
Corrective action Reduce the load weight.
Operation Panel Indication
FIN FR-PU04 H/Sink O/Temp
Name
Fin overheat
Description
If the heatsink overheats, the temperature sensor is actuated to
stop the inverter output.
Check point
• Check for too high ambient temperature.
• Check for heatsink clogging.
Corrective action
Set the ambient temperature to within the specifications.
Operation Panel Indication
GF FR-PU04 Ground Fault
Name
Start-time output side earth (ground) fault overcurrent
Description
This function stops the inverter output if an earth (ground) fault
overcurrent flows due to an earth (ground) fault which occurred on
the inverter's output (load) side. Made valid when Pr. 40 "start-time
earth (ground) fault detection selection" = "1".
Check point
Check for an earth (ground) fault in the motor and connection
cable.
Corrective action
Remedy the earth (ground) fault portion.