Mitsubishi Electric FR-A8NC Instruction Manual page 95

LED status
Inverters (FR-A8NC)
Master
unit
Station 1 Station 2
RUN  RUN
L.RUN  L.RUN 
SD  SD
RD  RD
L.ERR  L.ERR 
RUN  RUN
TIME  L.RUN  L.RUN 
LINE  SD  SD
or RD  RD
TIME  L.ERR  L.ERR 
LINE 
RUN  RUN
L.RUN  L.RUN 
SD  SD
RD  RD
L.ERR  L.ERR 
: On, : Off, : Flicker, : Any of on, flicker or off
94
HOW TO CHECK FOR ERROR USING THE LEDS
Station 3
 RUN 
Since the L.ERR LED of the FR-A8NC on
L.RUN 
station 2 is on, the FR-A8NC itself on station 2
 SD 
is affected by noise.
 RD 
(L.RUN may go off.)
L.ERR 
 RUN 
Since the L.ERR LEDs of the FR-A8NC on
L.RUN 
station 2 and later are on, the transmission
 SD 
cable between the inverters of stations 2 and 3
 RD 
is affected by noise. (L.RUN may go off.)
L.ERR 
 RUN 
The terminating resistor has been left unfitted,
L.RUN 
or the one-touch connector plug with
 SD 
terminating resistor has been left unfitted.
 RD 
(L.RUN may go off.)
L.ERR 
Cause
Securely earth (ground) each
inverter and the master module.
Check if shielding (drain) wires of
the CC-Link dedicated cable are
properly inserted to the one-touch
communication connector plug.
(Refer to
Also run it as far away as
possible from the power lines.
(100 mm or more)
• Check that the setting of the
• Use the one-touch connector
Corrective action
page 16)
terminating resistor selection
switch is correct.
(Refer to page 23)
plug with terminating resistor.
(Refer to page 20)