Instruction manual

PROTECTIVE FUNCTIONS
178
Operation Panel
Indication
E. 7
FR-PU04 CPU error
Name
CPU error
Description
If the arithmetic operation of the peripheral circuit of the built-in CPU does not
end within a predetermined period, the inverter self-determines it as an alarm
and stops the output.
Check point 
Corrective action • Make connection securely.
Operation Panel
Indication
E.P24
FR-PU04 
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.)
Corrective action • Wire the cables properly.
Operation Panel
Indication
E.MB1
to MB7
FR-PU04 
Name
Brake sequence error
Description This function stops the inverter output if a sequence.
Check point Check brake sequence.
Corrective action Check the set parameters and wire correctly.