Communication Stops During Operation - Mitsubishi Electric FR-E720-0.1KNC Instruction Manual

4.8.4

Communication stops during operation

• Check that CC-Link dedicated cable is fitted properly. (Check for contact fault, break in the cable, etc.)
• Check that the programmable controller program is executed properly.
• Check that data communication has not stopped due to an instantaneous power failure, etc.
LED States
Master Inverters (FR-E700-NC)
Station 1 Station 2
Module
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
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
How to check for error using the LEDs
Cause
Station 3
RUN
Since the L.RUN LEDs of the inverter on
L.RUN
station 1 and the inverter on station 3 are
SD *
OFF, the station numbers of the inverters
RD
set as stations 1 and 3 are the same.
L.ERR
Since the L.RUN and SD LEDs of the
RUN
inverter on station 2 are OFF, the
L.RUN
SD
transmission speed setting of the inverter
RD
on station 2 is wrong within the setting
L.ERR
range (0 to 4).
Since the L.ERR LED on the inverter on
RUN
station 3 flickers, the station number
L.RUN
setting of the inverter on station 3 is
SD
changed during normal operation, or the
RD
transmission speed is changed during
L.ERR
normal operation.
RUN
Since the L.ERR LED of the inverter on
L.RUN
station 2 is ON, the inverter itself on
SD
station 1 is affected by noise.
RD
(L.RUN may go OFF.)
L.ERR
Since the L.ERR LEDs of the inverter on
RUN
station 2 and later are ON, the
L.RUN
SD transmission cable between the
RD
inverters of stations 2 and 3 is affected
L.ERR
by noise. (L.RUN may go OFF.)
The plug-in terminating resistor selection
RUN
switch (SW1) has been left unset, or the
L.RUN
SD
one-touch connector plug with
RD
terminating resistor has been left
L.ERR
unfitted. (L.RUN may go OFF.)
After correcting the repeated station
numbers of the inverters using Pr. 542
Communication station number (CC-Link),
switch power ON again.
After correcting the transmission speed
setting using Pr. 543 Baud rate selection
(CC-Link), switch power on again.
After setting back Pr.542 Communication
station number (CC-Link) and Pr.543 Baud
rate selection (CC-Link) to their original
settings, power ON the inverter again.
Securely earth (ground) each inverter and
the master module.
Check if shielding wires of the CC-Link
dedicated cable are properly inserted to
the one-touch communication connector
plug. (Refer to page 51.)
Place the CC-Link dedicated cable as far
as possible from the power cable. (100mm
or more)
Check the setting of the terminating
resistor selection switch (SW1). (Refer to
page 50.)
Use the one-touch connector plug with
terminating resistor. (Refer to page 53.)
: ON, : OFF, : Flicker, *: Any of ON, flicker or OFF
Corrective Action
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