PROTECTIVE FUNCTIONS
145
FR-PU04 Indication
PU Leave Out
Name
Parameter unit disconnection
Description
This function stops the inverter output if communication
between the inverter and PU is suspended, e.g. the PU is
disconnected, when "2", "3", "16" or "17" was set in Pr. 75.
This function stops the inverter output if the number of
successive communication errors is greater than the number
of permissible retries when the Pr. 121 value is "9999" for
RS-485 communication from the PU connector.
Check point
•
Check for loose fitting of the operation panel or FR-PU04.
•
Check the Pr. 75 setting.
Corrective action
Fit the operation panel and FR-PU04 securely.
FR-PU04 Indication
Retry No Over
Name
Retry count exceeded
Description
If operation cannot be resumed properly within the number of
retries set, this function stops the inverter output.
Check point
Find the cause of alarm occurrence.
Corrective action
Eliminate the cause of the error preceding this error
indication.
FR-PU04 Indication
CPU Fault
Name
CPU error
Description
If the arithmetic operation 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
Please contact your sales representative.
FR-PU04 Indication
E. LF
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.
(2) Minor fault
FR-PU04 Indication
Fan fault
Name
Fan fault
Description
For the inverter which contains a cooling fan, FN appears on
the operation panel when the cooling fan stops due to a fault
or operates differently from the setting of Pr. 244 "cooling fan
operation selection".
Check point
Check the cooling fan for a fault.
Corrective action
Change the fan.
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