Mitsubishi Electric FR-S500 Series Instruction Manual page 68

Operation
Panel
Indication
External thermal relay
(OHT)
(*3)
Stall prevention
(OLT)
(overload)
Communication error
(OPT)
Parameter storage
(PE)
device alarm
PU disconnected
(PUE)
Retry count over
(RET)
CPU error
(CPU)
*3. Activated only when any of Pr. 60 to Pr. 63 (input terminal function selection) is set to OH.
(2) Minor failures
Operation
Panel
Indication
Fan trouble
(FN)
Function Name
Function Name
Definition
External thermal relay provided for protection from
overheat was actuated (contact open).
Stall prevention was activated to drop the running
frequency to 0. (OL appears while stall prevention
is activated.)
• Communication errors occurred consecutively
more than the permissible number of retries
when the RS-485 connector is used and
communication parameter n5
• RS-485 communication error occurred.
• Communication has broken for a period set in
communication parameter n6.
Error occurred in the parameter stored.
PU was disconnected when communication
parameter n17 = "1".
Operation could not be resumed properly within the
preset number of retries.
Arithmetic operation of the built-in CPU does not
end within the predetermined time.
Definition
The cooling fan built in the inverter failed
(stopped).
63
About errors (definitions)
≠
"- - -".
7