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PROTECTIVE FUNCTIONS
166
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
(approximately 300V for the 400V class), this function stops the inverter output.
When a jumper is not connected across P-P1 <+ - 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 <+ - P1>.
Corrective action
Check the power supply system equipment such as power supply.
Connect a jumper or DC reactor across terminals P-P1 <+ - P1>.
Operation Panel
Indication
E.FIN
FR-PU04
H/Sink O/Temp
Name
Fin overheat
Description
If the cooling fin overheats, the overheat sensor is actuated to stop the inverter
output.
Check point
•
Check for too high ambient temperature.
•
Check for cooling fin clogging.
Corrective action
Set the ambient temperature to within the specifications.
Operation Panel
Indication
E.GF
FR-PU04
Ground Fault
Name
Output side ground fault overcurrent protection
Description
This function stops the inverter output if a ground fault overcurrent flows due to
a ground fault which occurred in the inverter's output (load) side.
Check point
Check for a ground fault in the motor and connection cable.
Corrective action
Remedy the 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.
Note 3: This function is activated only when OH has been set to any of Pr. 180 to Pr. 186 (input terminal
function selection).
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