69
Causes and corrective actions
5
TROUB
L
E
S
HOOTING
Operation Panel
Indication
E.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
1. Check for too high ambient temperature.
2. Check for heatsink clogging.
Corrective action
1. Set the ambient temperature to within the specifications.
2. Clean the heatsink.
Operation Panel
Indication
E.IPF
FR-PU04
Inst. Pwr. Loss
Name
Instantaneous power failure protection
Description
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
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.
Corrective action
· Remedy the instantaneous power failure.
· Prepare a backup power supply for instantaneous power failure.
· Set the function of automatic restart after instantaneous power failure (
Pr. 57
).
(Refer to the
Instruction Manual (applied).)
Operation Panel
Indication
E.BE
FR-PU04
Br. Cct. Fault
Name
Brake transistor alarm detection
Description
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.
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.
Check point
· Reduce the load inertia.
· Check that the frequency of using the brake is proper.
· Check that the brake resistor selected is correct.
Corrective action
For the FR-F740-01800 or more, when the protective function is activated even if the above
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
Indication
E.UVT
FR-PU04
Under Voltage
Name
Undervoltage protection
Description
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
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.
Check point
1. Check for start of large-capacity motor.
2. Check that a jumper or DC reactor is connected across terminals P/+-P1.
Corrective action
1. Check the power supply system equipment such as the power supply.
2. Connect a jumper or DC reactor across terminals P/+-P1.
Operation Panel
Indication
E.ILF
FR-PU04
Fault 14
Name
Input phase failure
Description
This alarm is output when function valid setting (=1) is set in
Pr.872 Input phase failure protection selection
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.
Corrective action
· Wire the cables properly.
· Repair a brake portion in the cable.
· Check the
Pr. 872 Input phase failure protection selection
setting.
Summary of Contents for FR-F700 Series
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