Mitsubishi Electric FR-A820-00046 Instruction Manual page 911

Protective functions
Operation panel
indication
Name
Description
Check point
Corrective action
10 ms for IP55 compatible models
Operation panel
indication
Name
Description
Check point
Corrective action
Operation panel
indication
Name
Description
Check point
Corrective action
FR-A800
E.IPF
Instantaneous power failure (Standard models and IP55 compatible models only)
If a power failure occurs for longer than 15 ms
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 page 5-562, page 5-571.)
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 page 5-562, page 5-571.)
E.UVT
Undervoltage (Standard models and IP55 compatible 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 150 V AC (300 V AC for the 400 V
class) 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 page 5-562, page 5-571.)
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 and IP55 compatible 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 5-306)
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.
Causes and corrective actions
FR-LU-08 Instant Pwr failure
(this also applies to inverter input shut-off ), the
FR-LU-08 Under Voltage
FR-LU-08 Input phase loss
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