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PROTECTIVE FUNCTIONS
169
Operation Panel
Indication
E.P24
FR-PU04
E. P24
Name
24VDC power output short circuit
Description
When the 24VDC power output from the PC terminal is shorted, this function
shuts off the power output. At this time, all external contact inputs switch off.
The inverter cannot be reset by entering the RES signal. To reset, use the
operation panel or switch power off, then on again.
Check point
Check for a short circuit in the PC terminal output.
Corrective action
Remedy the short circuit portion.
Operation Panel
Indication
E.CTE
FR-PU04
Name
Operation panel power supply short circuit
Description
When the operation panel power supply (P5S of the PU connector) is shorted,
this function shuts off the power supply output. At this time, the operation panel
(parameter unit) cannot be used and RS-485 communication from the PU
connector cannot be made. To reset, enter the RES signal or switch power off,
then on again.
Check point
Check for a short circuit in the PU connector cable.
Corrective action
Check the PU and cable.
Operation Panel
Indication
E.LF
FR-PU04
Name
Output phase failure protection
Description
This function stops the inverter output if one of the three phases (U, V, W) on
the inverter's output side (load side) results in open phase.
Check point
•
Check the wiring (Check the motor for a fault.)
•
Check that the capacity of the used motor is not smaller than the inverter
capacity.
Corrective action
•
Wire the cables properly.
•
Check the setting of Pr. 251 "output phase failure protection selection".