148
Causes and corrective actions
Operation Panel
Indication
E.FIN
FR-PU04
FR-PU07
H/Sink O/Temp
Name
Fin overheat
Description
If the heatsink overheats, the temperature sensor is actuated to stop the inverter output.
The FIN signal can be output when the temperature becomes approximately 85% of the heatsink
overheat protection 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 to Pr. 196 (output terminal function selection)
.
(Refer to chapter 4 of
the instruction manual (applied))
Check point
1. Check for too high surrounding air temperature.
2. Check for heatsink clogging.
3. Check that the cooling fan is stopped. (Check that
is displayed on the operation panel.)
Corrective action
1. Set the surrounding air temperature to within the specifications.
2. Clean the heatsink.
3. Replace the cooling fan.
Operation Panel
Indication
E.IPF
FR-PU04
FR-PU07
Inst. Pwr. Loss
Name
Instantaneous power failure
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 trip the inverter in order to prevent the
control circuit from malfunctioning. If a power failure persists for longer than 100ms, the fault 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.
When instantaneous power failure protection is activated, the IPF signal is output.
(Refer to chapter 4 of
the instruction manual (applied))
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 chapter 4 of
the instruction manual (applied) .)
Operation Panel
Indication
E.UVT
FR-PU04
FR-PU07
Under Voltage
Name
Undervoltage
Description
If the power supply voltage of the inverter decreases, the control circuit will not perform normal functions.
In addition, the motor torque will be insufficient and/or heat generation will increase. To prevent this, if
the power supply voltage decreases below about 150VAC (300VAC for the 400V class), this function
stops the inverter output.
When undervoltage protection is activated, the IPF signal is output.
(Refer to chapter 4 of
the
instruction manual (applied))
Check point
Check for start of large-capacity motor.
Corrective action
· Check the power supply system equipment such as the power supply.
· If the problem still persists after taking the above measure, please contact your sales representative.
Operation Panel
Indication
E.ILF
FR-PU04
Fault 14
FR-PU07
Input phase loss
Name
Input phase failure
Description
This fault is output when function valid setting (= 1) is set in
Pr. 872 Input phase loss protection selection
and one phase of the three phase power input is lost.
(Refer to chapter 4 of
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 break portion in the cable.
· Check the
Pr. 872 Input phase loss protection selection
setting.
Summary of Contents for FR-A741-11K
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