MITSUBISHI ELECTRIC FR-S520 - Manual (Page 150)

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Operation Panel Indication PUE FR-PU04 PU Leave Out
Name PU disconnected (*3)
Description
Stops the inverter output if communication between inverter and
PU is suspended, e.g. if the PU is disconnected with "1" set in the
communication parameter n17 "PU disconnection detection/PU
setting lock".
Check point
Check that the FR-PU04 is fitted securely.
Check the setting of the communication parameter n17 "PU
disconnection detection".
Corrective action Fit the FR-PU04 securely.
*3. For only the type having the RS-485 communication function.
Operation Panel Indication RET FR-PU04 Retry No Over
Name Retry count
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 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 Please contact your sales representative.
(2) Minor failures
When the protective function is activated, the output is not shut off. You can make
parameter setting to output the light fault signal. (Set "98" in any of Pr. 64, Pr. 65
(output terminal function selection). Refer to page 90)
Operation Panel Indication FN FR-PU04 FN
Name Fan trouble
Description
For the inverter which contains a cooling fan, appears on the
operation panel when the cooling fan stops due to a fault or
operates differently from the setting of Pr. 76 "cooling fan
operation selection".
Check point Check the cooling fan for a fault.
Corrective action Change the fan.