Instruction manual

PROTECTIVE FUNCTIONS
177
Operation Panel
Indication
E.PUE
FR-PU04 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 operation panel or PU is disconnected, when "2",
"3", "16" or "17" was set in Pr. 75 "reset selection/disconnected PU detection/PU
stop selection". This function stops the inverter output if the number of
successive communication errors is greater than the permissible number of
retries when the Pr. 121 value is "9999" for RS-485 communication from the PU
connector. This function stops the inverter output if communication is broken for
the time set in Pr. 122.
Check point
• Check for loose fitting of the DU or PU.
• Check the Pr. 75 setting.
Corrective action Fit the DU and PU securely.
Operation Panel
Indication
E.RET
FR-PU04 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.
Operation Panel
Indication
E.CPU
FR-PU04 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 • Make connection securely.
Operation Panel
Indication
E. 6
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 Check for a loose connector.
Corrective action • Make connection securely.
5