201
PROTECTIVE FUNCTIONS
5
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
≠
"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.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
• Check the cables properly.
• Check the setting of Pr. 251 "output phase failure protection selection".
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.
• Contact your sales representative.
Operation Panel
Indication
E. 1
to
E. 3
FR-PU04 Fault 1 to Fault 3
Name Option fault
Description
The inverter output is stopped if a contact fault occurs at the connector between the
inverter and communication option, a fault of the communication option itself, etc. occurs.
Check point
• Check that the communication option is plugged in the connector securely.
(1 to 3 indicate the option slot numbers.)
• Check for excess electrical noises around the inverter.
Corrective action
• Connect the communication option securely.
• If there are any devices generating excess electrical noises around the inverter,
take measures against noises.
• Contact your sales representative.
