Mitsubishi Electric FR-V520-1.5K to 55K Instruction Manual page 76

Operation Panel
Indication
Name
Instantaneous power failure protection (*4)
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. At this time, the alarm warning output contacts open
Description
(across terminals B-C) and close (across terminals A-C). 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.)
Check point Find the cause of instantaneous power failure occurrence.
• Remedy the instantaneous power failure.
• Prepare a backup power supply for instantaneous power failure.
Corrective action
• Set the function of automatic restart after instantaneous power failure (Pr. 57).
4: When an instantaneous power failure occurs, the alarm display and alarm output are not provided, but the
*
inverter performs protective operation to prevent a fault from occurring in itself. In some operating status (load
magnitude, acceleration/deceleration time setting, etc.), overcurrent or other protection may be activated upon
power restoration.
Operation Panel
Indication
Name Undervoltage protection
If the power supply voltage of the inverter reduces, the control circuit will not perform normal
functions. In addition, the motor torque wiil be insufficient and/or heat generation will increase. To
Description prevent this, if the power supply voltage reduces below about 150V (300V for the 400V class), this
function stops the inverter output.
When a jumper is not connected across P-P1, the undervoltage protective function is activated.
• Check for start of large-capacity motor.
Check point
• Check that a jumper or DC reactor is connected across terminals P-P1.
Check the power supply system equipment such as power supply.
Corrective action
Connect a jumper or DC reactor across terminals P-P1.
Operation Panel
Indication
Name Fin overheat
Description If the heatsink overheats, the temperature sensor is actuated to stop the inverter output.
• Check for too high ambient temperature.
Check point
• Check for heatsink clogging.
• Check that the cooling fan is stopped.
• Set the ambient temperature to within the specifications.
Corrective action
• Replace the cooling fan.
Operation Panel
Indication
Name
Brake transistor alarm detection
This function stops the inverter output if an alarm occurs in the brake circuit, e.g. damaged brake
Description transistors.
In this case, the inverter must be powered off immediately.
• Reduce the load inertia.
Check point
• Check that the frequency of using the brake is proper.
• Check that the brake resistor selected is correct.
Corrective action Replace the inverter.
Operation Panel
Indication
Name
Output side earth (ground) fault overcurrent protection
This function stops the inverter output if an earth (ground) fault overcurrent flows due to an earth
Description
(ground) fault that occurred in the inverter's output (load) side.
Check point
Check for an earth (ground) fault in the motor and connection cable.
Corrective action Remedy the earth (ground) fault portion.
E.IPF
(Refer to page 56.)
E.UVT
E.FIN
E.BE
E.GF
FR-PU04V Inst. Pwr. Loss
FR-PU04V Under Voltage
FR-PU04V H/Sink O/Temp
FR-PU04V Br. Cct. Fault
FR-PU04V Ground Fault
72
Errors (Alarms)
6