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(3) When communication stops during operation
• Check that the CC-Link dedicated cables are connected properly.
(Check for poor contact, cable breakage, etc.)
• Check that the PLC program is executed without fault.
• Check that data communication is made without interruption due to an
instantaneous power failure, etc.
LED States
Master
Station
module
No. 1
#
L.RUN
SD
*
!
RD
#
L.ERR
#
!
TIME
L.RUN
#
!
LINE
SD
!
or
RD
!
#
TIME
L.ERR
#
LINE
!
L.RUN
!
SD
!
RD
#
L.ERR
!
L.RUN
!
SD
!
RD
#
L.ERR
!
TIME
!
!
LINE
L.RUN
or
!
SD
#
TIME
!
RD
!
LINE
#
L.ERR
!
L.RUN
!
SD
!
RD
#
L.ERR
Inverters
Station
Station
No. 2
No. 3
!
L.RUN
L.RUN
!
SD
SD
!
RD
RD
#
L.ERR
L.ERR
#
L.RUN
L.RUN
#
SD
SD
!
RD
RD
#
L.ERR
L.ERR
!
L.RUN
L.RUN
!
SD
SD
!
RD
RD
#
L.ERR
L.ERR
!
L.RUN
L.RUN
!
SD
SD
!
RD
RD
!
L.ERR
L.ERR
!
L.RUN
L.RUN
!
SD
SD
!
RD
RD
!
L.ERR
L.ERR
!
L.RUN
L.RUN
!
SD
SD
!
RD
RD
#
L.ERR
L.ERR
!
#
: On,
Cause
Since the L.RUN LEDs
#
of station No. 1 and 3
*
inverters are off, the
!
station numbers of
#
station No. 1 and 3
inverters are the same.
Since the L.RUN and
SD LEDs of station No.
!
2 inverter are off, the
!
transmission speed
!
setting of station No. 2
inverter is incorrect
#
within the setting range
(0 to 4).
Since the L.ERR LED
!
of station No. 3 inverter
!
is flickering, the station
number (Pr. 503) of
!
station No. 3 inverter
was changed during
normal operation.
Since the L.ERR LED
!
of station No. 2 inverter
!
is on, station No. 1
inverter is affected by
!
noise.
#
(The L.RUN LED may
become off.)
Since the L.ERR LEDs
of station No. 2 and 3
!
inverters are on, the
!
transmission cable
!
between these
inverters is affected by
!
noise. (The L.RUN LED
may become off.)
!
You forgot to fit the
!
terminating resistor.
!
(The L.RUN LED may
become off.)
!
: Off,
: Flicker, *: Any of on, flicker and off
47
LED On/Off Operations
Corrective Action
Switch power on again
after assigning different
station numbers to the
inverters having the
same station numbers.
Set correct
transmission speed
and power on the
inverter again.
Return the station
number (Pr. 503) of the
inverter to the original
value and power on the
inverter again.
Securely earth the FG
terminals of the
inverters and master
module.
Check the connection
of SLD of the
transmission cable.
Also, run the cable as
far away as possible
from the power line.
(More than 100mm)
Check whether the
terminating resistor is
fitted or not.
2
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