Mitsubishi Electric FR-A500 Instruction Manual page 204

Operation Panel
E.UVT
Indication
Name 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
Description
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
E.FIN
Indication
Name Fin overheat
If the heatsink overheats, the temperature sensor is actuated to stop the inverter
Description
output.
• Check for too high ambient temperature.
Check point
• Check for heatsink clogging.
Corrective action Set the ambient temperature to within the specifications.
Operation Panel
E.GF
Indication
Name Output side earth (ground) fault overcurrent protection
This function stops the inverter output if an earth (ground) fault overcurrent flows
Description due to an earth (ground) fault which occurred on the inverter's output side (load
side).
Check point Check for an earth (ground) fault in the motor and connection cable.
Remedy the earth (ground) fault portion.
Corrective action
Operation Panel
E.OHT
Indication
External thermal relay operation (Note 3)
Name
If the external thermal relay provided for motor overheat protection or the internally
mounted temperature relay in the motor switches on (contacts open), the inverter
Description
output is stopped. If the relay contacts are reset automatically, the inverter will not
restart unless it is reset.
• Check for motor overheating.
Check point • Check that the value of "7" (OH signal) is set correctly in any of Pr. 180 to Pr. 186
(input terminal function selection).
Corrective action Reduce the load and operating duty.
Note: 3. This function is activated only when OH has been set to any of Pr. 180 to Pr. 186 (input terminal
function selection).
PROTECTIVE FUNCTIONS
FR-PU04
FR-PU04
FR-PU04
FR-PU04
195
Under Voltage
H/Sink O/Temp
Ground Fault
OH Fault
5