Mitsubishi Electric F700 Instruction Manual page 250

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
Operation Panel
Indication
Name
Description
Check point
Corrective action
242
E.FIN
Fin overheat
If the heatsink overheats, the temperature sensor is actuated to stop the inverter output.
The FIN signal can be output when the temperature becomes approximately 85% of the heatsink
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) in any of Pr. 190 to Pr. 196 (output terminal function selection). (Refer to
1. Check for too high ambient temperature.
2. Check for heatsink clogging.
3. Check that the cooling fan is stopped. (Check that
1. Set the ambient temperature to within the specifications.
2. Clean the heatsink.
3. Replace the cooling fan.
E.IPF
Instantaneous power failure
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.), 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.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 when using functions of the 75K or more.
In this case, the inverter must be powered off immediately.
For the 55K or less, it appears when an internal circuit error occurred.
· Reduce the load inertia.
· Check that the frequency of using the brake is proper.
· Check that the brake resistor selected is correct.
For the 75K or more, when the protective function is activated even if the above measures are taken,
replace the brake unit with a new one.
For the 55K or less, replace the inverter.
E.UVT
Undervoltage
If the power supply voltage of the inverter decreases, the control circuit will not perform normal functions.
In addition, the motor torque wiil be insufficient and/or heat generation will increase. To prevent this, if
the power supply voltage decreases below about 150V (300VAC 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.
When undervoltage protection is activated, the IPF signal is output. (Refer to
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
H/Sink O/Temp
FR-PU07
is displayed on the operation panel.)
FR-PU04
Inst. Pwr. Loss
FR-PU07
FR-PU04
Br. Cct. Fault
FR-PU07
FR-PU04
Under Voltage
FR-PU07
page 107)
page 126)
page 126.)
page 126)