Mitsubishi Electric FR-S500 Instruction Manual page 50

Operation
Panel
Indication
External thermal relay
(OHT)
(*3)
Stall prevention
(OLT)
(overload)
Brake transistor alarm
(BE)
Communication error
(OPT)
Parameter storage
(PE)
device alarm
PU disconnected
(PUE)
Retry count excess
(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)
(3) Warnings
Operation
Panel
Indication
Stall prevention
(OL)
(overcurrent) (*4)
Stall prevention
(oL)
(overvoltage)
PU stop
(PS)
Undervoltage
(UV)
*4. The stall prevention operation current may be set to any value. It is factory set to 150%.
Function Name
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.)
Error occurred in the brake circuit, e.g. damaged
brake transistors.
• Communication errors occurred consecutively
more than the permissible number of retries
when the RS-485 connector is used and commu-
nication 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).
Definition
Current more than 150% of the rated inverter
current flew in the motor and operation is being
performed to prevent the inverter from resulting
in overcurrent shut-off.
Regenerative energy of the motor became
excessive and operation is being performed to
stop the frequency from decreasing to prevent
overvoltage shut-off.
Pr. 75 "reset selection/PU stop selection" had
been set and a stop was made by pressing
STOP
the of the operation panel or parameter
RESET
unit (FR-PU04).
Power supply voltage of the inverter dropped.
45
About errors (definitions)
≠
"- - -".
7