Mitsubishi FR-S500 Instruction Manual page 169

Operation Panel Indication
Name
Description
Check point
Corrective action
Operation Panel Indication
Name
Description
Check point
Corrective action
*1. Resetting the inverter initializes the internal thermal integratied data of the
electronic thermal relay function.
Operation Panel Indication
Name
Description
Check point
Corrective action
Operation Panel Indication
Name
Description
Corrective action
THM
Motor overload shut-off (electronic thermal relay function) (* 1)
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 the motor for use under overload.
• Reduce the load weight.
• For a constant-torque motor, set the constant-torque motor in Pr.
71 "applied motor".
THT
Inverter overload shut-off (electronic thermal relay function) (* 1)
If a current of more than 150% 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 the motor for use under overload.
Reduce the load weight.
FIN
Fin overheat
If the heatsink overheats, the temperature sensor is actuated to
stop the inverter output.
• Check for too high ambient temperature.
• Check for heatsink clogging.
Set the ambient temperature to within the specifications.
BE
Internal circuit error
Appears when an internal circuit error occurred.
Please contact your sales representative.
159
Errors (Alarms)
FR-PU04 Motor Overload
FR-PU04 Inv. Overload
FR-PU04 H/Sink O/Temp
FR-PU04 Br. Cct. Fault
3