Mitsubishi Electric FR-A700 Instruction Manual page 732

Causes and corrective actions
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
7 - 14
E.IPF
Instantaneous power failure protection
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.), over current or other protection may be activated upon
power restoration.
When instantaneous power failure protection is activated, the IPF signal is output. (Refer to
section 6.16.)
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
section 6.16.1.)
E.BE
Brake transistor alarm detection/internal circuit error
This function stops the inverter output if an alarm occurs in the brake circuit, e.g. damaged
brake transistors.
In this case, the inverter must be powered off immediately.
Reduce the load inertia.
Check that the frequency of using the brake is proper.
Replace the inverter.
E.UVT
Under voltage protection
If the power supply voltage of the inverter reduces, the control circuit will not perform nor-
mal functions. In addition, the motor torque will be insufficient and/or heat generation will
increase. To prevent this, if the power supply voltage reduces below about 300V for the
400V class, this function stops the inverter output.
When a jumper is not connected across P/+-P1, the under voltage protective function is
activated.
When undervoltage protection is activated, the IPF signal is output. (Refer to section 6.16.)
1) Check for start of large-capacity motor.
2) Check that a jumper or DC reactor is connected across terminals P/+-P1.
1) Check the power supply system equipment such as the power supply.
2) Connect a jumper or DC reactor across terminals P/+-P1.
3) If the problem still persists after taking the above measure, please contact your sales
representative.
FR-PU04
Inst. Pwr. Loss
FR-PU07
FR-PU04
Br. Cct. Fault
FR-PU07
FR-PU04
Under Voltage
FR-PU07
Troubleshooting