Mitsubishi Electric FR-A7NC E kit-SC Instruction Manual page 93

HOW TO CHECK FOR ERROR USING THE LEDS
LED Status
Inverters (FR-A7NC)
Master
Module
Station 1 Station 2 Station 3
RUN  RUN
L.RUN  L.RUN 
SD  SD
RD  RD
L.ERR  L.ERR 
TIME  RUN  RUN
LINE  L.RUN  L.RUN 
SD * SD
or
TIME  RD * RD
LINE  L.ERR  L.ERR 
RUN RUN

L.RUN  L.RUN 
SD * SD
RD * RD
L.ERR * L.ERR
86
 RUN  Since the L.RUN LEDs of the FR-
L.RUN  A7NC on station 2 and later are OFF,
* SD * the transmission cable between the
* RD * remote I/O units A and B is open or
L.ERR  disconnected from the terminal block.
 RUN 
L.RUN 
* SD * The transmission cable is shorted.
* RD *
L.ERR 
RUN
 
L.RUN 
The transmission cable is wired
* SD *
improperly.
* RD *
* L.ERR *
: ON,

Cause
Referring to the LED "ON"
condition, search for an
open point and repair.
Among the three wires of
the transmission cable,
search for the shorted wire
and repair.
Check the wiring on the
inverter terminal block and
correct the improper wiring
point.
: OFF, : Flicker, *: Any of ON, flicker or OFF
 
Corrective Action