Mitsubishi Electric FR-D720-0.2K-G Instruction Manual page 262

Operation panel
E.THT
indication
Name
Drive unit overload trip (electronic thermal O/L relay function)
If the temperature of the output transistor element exceeds the protection level under the condition that a current not
Description less than the drive unit rated current flows and overcurrent trip does not occur (200% or less), the electronic thermal
relay activates to stop the drive unit output. (Overload capacity 150% 60s, 200% 0.5s)
 Check that acceleration/deceleration time is not too short.
Check point
 Check the motor for use under overload.
 Check for too high surrounding air temperature.
 Increase acceleration/deceleration time.
 Adjust the Pr. 785 PM control torque boost and Pr. 795 DC brake torque boost settings.
Corrective action
 Reduce the load weight.
 Set the surrounding air temperature to within the specifications.

Resetting the drive unit initializes the internal accumulated heat value of the electronic thermal relay function.
Operation panel
E.THM
indication
Name
Motor overload trip(electronic thermal O/L relay function)
The electronic thermal relay function in the drive unit detects motor overheat due to overload or reduced cooling
capability during low-speed operation, and pre-alarm (TH display) is output when the integrated value reaches 85%
Description
of the Pr. 9 Electronic thermal O/L relay setting, and the protection circuit is activated to stop the drive unit output when
the integrated value reaches the specified value.
 Check the motor for use under overload.
Check point
 Check that stall prevention operation setting is correct.
 Reduce the load weight.
Corrective action  Adjust the Pr. 785 PM control torque boost and Pr. 795 DC brake torque boost settings.
 Check that stall prevention operation setting is correct. (Refer to page 83.)

Resetting the drive unit initializes the internal accumulated heat value of the electronic thermal relay function.
Operation panel
E.FIN
indication
Name
Heatsink overheat
If the heatsink overheats, the temperature sensor is actuated and the drive unit trips.
The FIN signal can be output when the temperature becomes approximately 85% of the heatsink overheat protection
Description operation temperature.
For the terminal used for the FIN signal output, assign the function by setting "26 (positive logic) or 126 (negative
logic)" in any of Pr. 190 or Pr. 192 (output terminal function selection). (Refer to page 123.)
 Check for too high surrounding air temperature.
Check point  Check for heatsink clogging.
 Check that the cooling fan is not stopped (Check that
 Set the surrounding air temperature to within the specifications.
Corrective action
 Clean the heatsink.
 Replace the cooling fan.
Causes and corrective actions
FR-PU07 Inv. Overload
FR-PU07 Motor Ovrload
FR-PU07 H/Sink O/Temp
is not displayed on the operation panel).
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