Mitsubishi Electric FR-A7NC Instruction Manual page 88

HOW TO CHECK FOR ERROR
USING THE LEDS
LED States
Inverters (FR-A7NC)
Master
Unit
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
82
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, the
SD 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
Cause
Securely connect FG of each
inverter and master unit 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 8)
: On, : Off, : Flicker, *: Any of on, flicker or off
Corrective Action