Mitsubishi FR-A500 Series Instruction Manual page 199

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
Note 3: This function is activated only when OH has been set to any of Pr. 180 to Pr. 186 (input terminal
function selection).
E.UVT
Undervoltage protection
If the power supply voltage of the inverter reduces, the control circuit will not
operate properly and will result in decreased motor torque or increased heat
generation. To prevent this, if the power supply voltage reduces below 150V
(about 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 that a jumper or DC reactor is connected across terminals P/+-P1.
Check the power supply system equipment such as power supply.
Connect a jumper or DC reactor across terminals P/+-P1.
E.FIN
Fin overheat
If the cooling fin overheats, the overheat sensor is actuated to stop the inverter
output.
• Check for too high ambient temperature.
• Check for cooling fin clogging.
Set the ambient temperature to within the specifications.
E.GF
Output side ground fault overcurrent protection
This function stops the inverter output if a ground fault overcurrent flows due to a
ground fault which occurred in the inverter's output side (load side).
Check for a ground fault in the motor and connection cable.
Remedy the ground fault portion.
E.OHT
External thermal relay operation (Note 3)
If the external thermal relay designed for motor overheat protection or the
internally mounted temperature relay in the motor switches on (contacts open),
the inverter output is stopped. If the relay contacts are reset automatically, the
inverter will not restart unless it is reset.
• Check for motor overheating.
• Check that the value of 7 (OH signal) is set correctly in any of Pr. 180 to Pr. 186
(input terminal function selection).
Reduce the load and operating duty.
185
PROTECTIVE FUNCTIONS
FR-PU04
Under Voltage
FR-PU04
H/Sink O/Temp
FR-PU04
FR-PU04
Ground Fault
OH Fault
5