Mitsubishi Electric FR-A7NC E kit-SC Instruction Manual page 95

HOW TO CHECK FOR ERROR USING THE LEDS
LED States
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 
or SD  SD
TIME  RD  RD
LINE  L.ERR  L.ERR 
RUN  RUN
L.RUN  L.RUN 
SD  SD
RD RD

L.ERR  L.ERR 
88
RUN
 
Since the L.ERR LED of the FR-A7NC
L.RUN 
on station 2 is ON, the FR-A7NC itself
 SD 
on station 2 is affected by noise.
 RD 
(L.RUN may go OFF.)
L.ERR 
 RUN  Since the L.ERR LEDs of the FR-
L.RUN  A7NC on station 2 and later are ON,
 SD  the transmission cable between the
 RD  inverters of stations 2 and 3 is affected
L.ERR  by noise. (L.RUN may go OFF.)
 RUN 
L.RUN 
Terminating resistor is not selected.
 SD 
(L.RUN may go OFF.)
RD
 
L.ERR 
: ON,

Cause
Securely connect FG of each
inverter and master module
to ground.
Check that the transmission
cable is connected to SLD.
Also run it as far away as
possible from the power
lines. (100mm or more)
Check that the setting of the
terminating resistor selection
switch is correct.
(refer to page 13)
: OFF, : Flicker, *: Any of ON, flicker or OFF

Corrective Action