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LED On/Off Operations
(2) When two or more inverters are connected
The following table indicates the fault causes and corrective actions that can be
determined from the inverter LED states under the condition that the SW, M/S and
PRM LEDs of the master module are off (the master module has been set properly) in
the following system configuration.
!
: On,
#
##
#
: Off, : Flicker, *: Any of on, flicker and off
LED States
Cause Corrective Action
Master
module
Inverters
Station
No. 1
Station
No. 2
Station
No. 3
TIME
#
LINE
#
or
TIME
!
LINE
#
L.RUN
!
SD !
RD
!
L.ERR
#
L.RUN
!
SD !
RD
!
L.ERR
#
L.RUN
!
SD !
RD
!
L.ERR
#
Normal
L.RUN
#
SD
#
RD
#
L.ERR
#
L.RUN !
SD
!
RD
!
L.ERR
#
L.RUN !
SD
!
RD
!
L.ERR
#
Poor contact of the
inverter and CC-Link
connectors
Check the connectors.
L.RUN
!
SD
!
RD
!
L.ERR
#
L.RUN
#
SD *
RD *
L.ERR
#
L.RUN
#
SD *
RD *
L.ERR
#
Since the L.RUN LEDs
of station No. 2
inverters are off, cable
breakage occurred in
the transmission cable
between the remote
I/O modules A and B,
or the cable is
disconnected from the
terminal block.
Refer to the LED on/off
states, search for the
position of cable
breakage, and repair.
L.RUN
#
SD *
RD *
L.ERR
#
L.RUN
#
SD *
RD *
L.ERR
#
L.RUN
#
SD *
RD *
L.ERR
#
The transmission cable
is shorted.
Search for the shorted
wires of the three wires
in the transmission
cable, and repair.
L.RUN
#
SD *
RD *
L.ERR *
L.RUN
#
SD *
RD *
L.ERR *
L.RUN
#
SD *
RD *
L.ERR *
The transmission cable
is wired incorrectly.
Check the wiring of the
inverter's terminal
block and remedy the
incorrectly wired
portion.
CPU
Power supply
Master
module
Station No. 1
Inverter A
Station No. 2
Inverter B
Station No. 3
Inverter C