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Mitsubishi Electric FR-F700PJ Instruction Manual Page 309

Air-conditioning inverter.
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Causes and corrective actions
Operation panel
E.FIN
indication
Name
Heatsink overheat
If the heatsink overheats, the temperature sensor is actuated and the inverter 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 140)
 Check for too high surrounding air temperature.
 Check for heatsink clogging.
Check point
 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
E.UVT
indication
IPM
IPM
IPM
Name
Undervoltage
This function activates when the restart operation is repeatedly unsuccessful because the power supply voltage of
Description
the inverter has dropped.
Check point
Check if the power supply voltage is appropriate.
Corrective action
Investigate the devices on the power supply line such as the power supply itself.
Operation panel
E.ILF
indication
Name
Input phase loss
Inverter trips when function valid setting (=1) is selected in Pr. 872 Input phase loss protection selection and one phase of
the three phase power input is lost. (Refer to page 172)
Description
It may may be activated if phase-to-phase voltage of the three-phase power input becomes largely unbalanced.
When the setting of Pr. 872 Input phase loss protection selection is the initial value (Pr. 872 ="0"), this warning does not
occur.
 Check for a break in the cable for the three-phase power supply input.
Check point
 Check that phase-to-phase voltage of the three-phase power input is not largely unbalanced.
 Wire the cables properly.
 Repair a break portion in the cable.
Corrective action
 Check the Pr. 872 Input phase loss protection selection setting.
 Set Pr. 872 = "0" (without input phase loss protection) when three-phase input voltage is largely unbalanced.
Operation panel
E.OLT
indication
Name
Stall prevention stop
If the output frequency has fallen to 1Hz (1.5Hz under IPM motor control) by stall prevention operation and remains
Description
for 3s, a fault (E.OLT) appears and the inverter trips. OL appears while stall prevention is being activated.
E.OLT may not occur if stall prevention (OL) is activated during output phase loss.
 Check the motor for use under overload. (Refer to page 97)
Check point
 Check that a motor is connected during IPM motor control. (IPM motor control)
 Check if a start command is given to the inverter while the motor is coasting. (IPM motor control)
 Reduce the load weight. (Check the Pr. 22 Stall prevention operation level setting.)
 Check the connection of the IPM motor. (IPM motor control)
Corrective action
 Set the IPM motor test operation. (Refer to page 88)
 Input a start command after the motor stops. Alternatively, set the automatic restart after instantaneous power
failure/flying start function. (IPM motor control)
E.SOT
Operation panel
indication
IPM
IPM
IPM
Name
Loss of synchronism detection
Description
Stops the output when the operation is not synchronized. (This function is only available under IPM motor control.)
 Check that the IPM motor is not driven overloaded.
Check point
 Check if a start command is given to the inverter while the IPM motor is coasting.
 Check if a motor other than the IPM motor (MM-EF series) is driven.
 Set the acceleration time longer.
 Reduce the load.
 If the inverter restarts during coasting, set Pr.57 Restart coasting time "9999," and select the automatic restart after
Corrective action
instantaneous power failure.
 Drive the IPM motor (MM-EF series).
304
FR-PU04
H/Sink O/Temp
FR-PU07
is not displayed on the operation panel).
FR-PU04
Under Voltage
FR-PU07
FR-PU04
Fault 14
FR-PU07
Input phase loss
FR-PU04
Stll Prev STP
FR-PU07
(Refer to page 161.)
FR-PU04
Fault 14
FR-PU07
Motor step out

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