Mitsubishi Electric FR-HC2-7.5K Instruction Manual page 136

Operation Panel
Indication
Name Overvoltage trip
If the converter's internal main circuit DC voltage reaches or exceeds the specified value, the protective
Description circuit is activated to stop the converter operation.The circuit may also be activated by a surge voltage
produced in the power supply system.
 Check for sudden load change and excessive regeneration.
Checkpoint
 Check that any power supply failure did not occur.
 Keep the load stable.
Corrective action
 Check the power supply.
Operation Panel
Indication
Name
Overload trip (electronic thermal relay function)
For the protection of transistor, electronic thermal relay activates in inverse-time characteristics against the
Description
converter input to stop the converter operation.
 Check the motor for the use under overload.
Checkpoint
 Check if the inverter, which exceeds the converter capacity, is being used.
 Reduce the load.
Corrective action
 Reconsider the choices of the inverter and the converter.

Resetting the converter initializes the cumulative value of the internal thermal relay.
Operation Panel
Indication
Name Fin overheat
If the heatsink overheats, the temperature sensor is activated and the output of the converter operation stops.
The FIN signal can be output when the temperature becomes approximately 85% of the heatsink overheat
Description
protection operation temperature.
For the terminal used for FIN signal, set "10 (positive logic)" or "110 (negative logic)" to any of Pr. 11 to Pr. 16
(output terminal function selection). (Refer to page 78)
 Check for too high surrounding air temperature.
 Check for heatsink clogging.
Checkpoint
 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.
Operation Panel
Indication
Name Instantaneous power failure
When a power failure occurs (or when power input to the converter is shut off), the instantaneous power
failure protection function activates to stop the converter operation and prevent the control circuit from
malfunctioning. If a power failure persists for 100ms or longer, the alarm warning output is not provided, and
Description
the converter (inverter) restarts when the start signal is ON upon power restoration. In some operating status
(load magnitude, acceleration/deceleration time setting of the inverter, etc.), overcurrent or other protection
may be activated upon power restoration.
The IPF signal is output when a power failure is detected. (Refer to page 78)
Checkpoint
Identify the cause of instantaneous power failure occurrence.
 Recover the instantaneous power failure.
Corrective action
 Prepare a backup power supply for instantaneous power failure.
 Set the function of automatic restart after instantaneous power failure (Pr. 57). (Refer to page 89)
Operation Panel
Indication
Name
Undervoltage
If the power supply voltage of the converter decreases, the control circuit will not perform its normal functions.
Description
The converter operation is stopped when the power supply voltage decreases to about 150VAC (about
300VAC for the 400V class) or lower.
Checkpoint Check for start of large-capacity motor.
Check the power supply system equipment such as the power supply.
Corrective action
If the problem still persists after taking the above measure, please contact your sales representative.
E.OV2
E.THT
E.FIN
E.IPF
E.UVT
Causes and corrective actions
FR-PU07 Stedy Spd OV
FR-PU07 Inv. Overload

FR-PU07 H/Sink O/Temp
is not displayed on the operation panel.)
FR-PU07 Inst. Pwr. Loss
FR-PU07 Under Voltage
4
129