Mitsubishi Electric 800 Series Instruction Manual page 579

Abbreviation
Name
Description
Check point
Corrective action
Abbreviation
Name
Description
Check point
Corrective action
Abbreviation
Name
Description
Check point
Corrective action
Abbreviation
Name
Description
Check point
Corrective action
578
6. PROTECTIVE FUNCTIONS
6.4 Causes and corrective actions
E.FIN
Heat sink overheat
When the heat sink overheats, the temperature sensor activates, and the inverter output is stopped.
The FIN signal can be output when the temperature becomes approximately 85% of the heat sink 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)" from Pr.190 to Pr.196 (Output terminal function selection). (Refer to
• Check for too high surrounding air temperature.
• Check for heat sink clogging.
• Check that the cooling fan is not stopped. (Check that FN is not displayed on the operation panel.)
• Set the surrounding air temperature to within the specifications.
• Clean the heat sink.
• Replace the cooling fan.
E.IPF
Instantaneous power failure (Standard models only)
If a power failure occurs for longer than 15 ms (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 100 ms or longer, the fault 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 15 ms.) 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
Find the cause of instantaneous power failure occurrence.
• 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
E.UVT
Undervoltage (Standard models only)
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 to about 440 VAC or below, this function shuts off the inverter output.
When a jumper is not connected across P/+ and P1, the undervoltage protective function is activated.
When undervoltage protection is activated, the IPF signal is output. (Refer to
• Check if a high-capacity motor is driven.
• Check if the jumper is connected across terminals P/+ and P1.
• Check the power supply system equipment such as the power supply.
• Do not remove the jumper across terminals P/+ and P1 except when connecting a DC reactor.
• If the problem still persists after taking the above measure, contact your sales representative.
E.ILF
Input phase loss (Standard models only)
When Pr.872 Input phase loss protection selection is enabled ("1") and one of the three-phase power input
is lost, the inverter output is shut off. This protective function is not available when Pr.872 is set to the initial
value (Pr.872 = "0"). (Refer to page
Check for a break in the cable for the three-phase power supply input.
• Wire the cables properly.
• Repair a break portion in the cable.
FR-LU08 Heat sink overheat
FR-PU07 H/Sink O/Temp
FR-LU08 Instant Pwr failure
FR-PU07 Inst. Pwr. Loss
FR-LU08 Under Voltage
FR-PU07
FR-LU08 Input phase loss
FR-PU07
241)
page 297.)
page 448.)
page 448.)
page 448.)