Mitsubishi Electric FR-F700 Series Instruction Manual page 74

Operation Panel
E.FIN
Indication
Name
Fin overheat
Description
If the heatsink overheats, the temperature sensor is actuated to stop the inverter output.
1. Check for too high ambient temperature.
Check point
2. Check for heatsink clogging.
1. Set the ambient temperature to within the specifications.
Corrective action
2. Clean the heatsink.
Operation Panel
E.IPF
Indication
Name Instantaneous power failure protection
If a power failure occurs for longer than 15ms (this also applies to inverter input shut-off), the
instantaneous power failure protective function is activated to stop the inverter output in order to
prevent the control circuit from malfunctioning. If a power failure persists for longer than 100ms, the
Description
alarm warning output is not provided, and the inverter restarts if the start signal is on upon power
restoration. (The inverter continues operating if an instantaneous power failure is within 15ms.) In
some operating status (load magnitude, acceleration/deceleration time setting, etc.), overcurrent or
other protection may be activated upon power restoration.
Check point
Find the cause of instantaneous power failure occurrence.
· Remedy the instantaneous power failure.
· Prepare a backup power supply for instantaneous power failure.
Corrective action
· Set the function of automatic restart after instantaneous power failure (Pr. 57). (Refer to the
Instruction Manual (applied).)
Operation Panel
E.BE
Indication
Name
Brake transistor alarm detection
This function stops the inverter output if an alarm occurs in the brake circuit, e.g. damaged brake
transistors when using functions of the FR-F740-01800 or more.
Description
In this case, the inverter must be powered off immediately.
For the FR-F720-02330 (FR-F740-01160) or less, it appears when an internal circuit error
occurred.
· Reduce the load inertia.
Check point
· Check that the frequency of using the brake is proper.
· Check that the brake resistor selected is correct.
For the FR-F740-01800 or more, when the protective function is activated even if the above
Corrective action
measures are taken, replace the brake unit with a new one.
For the FR-F720-02330 (FR-F740-01160) or less, replace the inverter.
Operation Panel
E.UVT
Indication
Name Undervoltage protection
If the power supply voltage of the inverter reduces, the control circuit will not perform normal functions.
In addition, the motor torque wiil be insufficient and/or heat generation will increase. To prevent
Description
this, if the power supply voltage reduces below about 150V (300VAC for the 400V class), this
function stops the inverter output.
When a jumper is not connected across P/+-P1, the undervoltage protective function is activated.
1. Check for start of large-capacity motor.
Check point
2. Check that a jumper or DC reactor is connected across terminals P/+-P1.
1. Check the power supply system equipment such as the power supply.
Corrective action
2. Connect a jumper or DC reactor across terminals P/+-P1.
Operation Panel
E.ILF
Indication
Name
Input phase failure
This alarm is output when function valid setting (=1) is set in Pr.872 Input phase failure protection selection
Description
and one phase of the three phase power input opens. (Refer to the Instruction Manual (applied).)
Check point
Check for a break in the cable for the three-phase power supply input.
· Wire the cables properly.
Corrective action · Repair a brake portion in the cable.
· Check the Pr. 872 Input phase failure protection selection setting.
Causes and corrective actions
FR-PU04 H/Sink O/Temp
FR-PU04 Inst. Pwr. Loss
FR-PU04 Br. Cct. Fault
FR-PU04 Under Voltage
FR-PU04 Fault 14
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