Mitsubishi Electric FR-A500 Instruction Manual page 206

Operation Panel
E.PUE
Indication
Name Parameter unit disconnection
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
Description
communication errors is greater than the permissible number of retries when the Pr.
121
the inverter output if communication is broken for the time set in Pr. 122.
• Check for loose fitting of the DU or PU.
Check point
• Check the Pr. 75 setting.
Corrective action Fit the DU and PU securely.
Operation Panel
E.RET
Indication
Name Retry count exceeded
If operation cannot be resumed properly within the number of retries set, this
Description
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
E.LF
Indication
Name Output phase failure protection
• This function stops the inverter output if one of the three phases (U, V, W) on the
Description
inverter ' s output side (load side) results in open phase.
• Check the wiring (Check the motor for a fault).
Check point
• Check that the capacity of the used motor is not smaller than the inverter capacity.
• Check the cables properly.
Corrective action
• Check the setting of Pr. 251 "output phase failure protection selection".
Operation Panel
E.CPU
Indication
Name CPU error
If the arithmetic operation of the built-in CPU does not end within a predetermined
Description
period, the inverter self-determines it as an alarm and stops the output.
Check point
• Make connection securely.
Corrective action
• Contact your sales representative.
E. 1
Operation Panel
to
Indication
E. 3
Name Option fault
The inverter output is stopped if a contact fault occurs at the connector between the
Description
inverter and communication option, a fault of the communication option itself, etc. occurs.
• Check that the communication option is plugged in the connector securely.
Check point (1 to 3 indicate the option slot numbers.)
• Check for excess electrical noises around the inverter.
• Connect the communication option securely.
• If there are any devices generating excess electrical noises around the inverter,
Corrective action
take measures against noises.
• Contact your sales representative.
≠
"9999" for RS-485 communication from the PU connector. This function stops
197
PROTECTIVE FUNCTIONS
FR-PU04 PU Leave Out
FR-PU04 Retry No Over
FR-PU04
FR-PU04

FR-PU04 Fault 1 to Fault 3

CPU Fault
5