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PROTECTIVE FUNCTIONS
5
Note: 3. This function is activated only when OH has been set to any of Pr. 180 to Pr. 186 (input terminal
function selection).
Operation Panel
Indication
E.UVT FR-PU04 Under Voltage
Name Undervoltage protection
Description
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 point
Check for start of large-capacity motor.
Check that a jumper or DC reactor is connected across terminals P-P1.
Corrective action
Check the power supply system equipment such as power supply.
Connect a jumper or DC reactor across terminals P-P1.
Operation Panel
Indication
E.FIN FR-PU04 H/Sink O/Temp
Name Fin overheat
Description
If the heatsink overheats, the temperature sensor is actuated to stop the inverter
output.
Check point
• Check for too high ambient temperature.
• Check for heatsink clogging.
Corrective action Set the ambient temperature to within the specifications.
Operation Panel
Indication
E.GF FR-PU04 Earth (Ground) Fault
Name Output side earth (ground) fault overcurrent protection
Description
This function stops the inverter output if an earth (ground) fault overcurrent flows
due to an earth (ground) fault which occurred in the inverter's output side (load
side).
Check point Check for an earth (ground) fault in the motor and connection cable.
Corrective action Remedy the earth (ground) fault portion.
Operation Panel
Indication
E.OHT FR-PU04 OH Fault
Name External thermal relay operation (Note 3)
Description
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 point
• 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).
Corrective action Reduce the load and operating duty.
