Mitsubishi FR-E520-0.1KN Instruction Manual page 166

(2) Connection of two or more inverters
The following example indicates the causes and corrective actions for faults which
may be judged from the operating status indicator LED states of the inverters under
the condition that the SW, M/S and PRM LEDs of the master unit are off (the
master unit setting is correct) in the following system configuration.
Power CPU
supply
LED States
Remote I/O unit
Master
unit
Station 1
!
L. RUN L. RUN
!
SD SD
TIME #
!
RD RD
LINE #
L. ERR # L. ERR #
or
L. RUN #
L. RUN
!
TIME
#
SD SD
LINE #
#
RD RD
L. ERR # L. ERR #
!
L. RUN #
L. RUN
!
SD SD
!
RD RD
L. ERR # L. ERR #
!
TIME
!
L. RUN # L. RUN #
LINE
or SD * SD
TIME #
RD * RD
!
L. ERR # L. ERR #
LINE
L. RUN # L. RUN #
SD * SD
RD * RD
*
L. ERR L. ERR
Master
unit
Station 1
Inverter A
Station 2 Station 3
! !
L. RUN
! !
SD
! !
RD
L. ERR #
! !
L. RUN
Since the LEDs of station 1 inverter are
! !
SD
all off, 5V power is not supplied or
! !
RD
voltage is insufficient.
L. ERR #
Since the L.RUN LEDs of station 2
L. RUN #
inverter and later are off, the
* SD *
transmission cable between inverters A
* RD *
and B is open or disconnected from the
L. ERR #
terminal block.
L. RUN #
* SD *
The transmission cable is shorted.
* RD *
L. ERR #
L. RUN #
* SD * The transmission cable is wired
* RD * improperly.
* *
L. ERR
!
PROTECTIVE FUNCTIONS
Station 2
Inverter B
Cause
Normal
: On, #: Off, ": Flicker,
150
Station 3
Inverter C
Corrective Action

Check the voltage of the
24V power supply and
supply normal power to
the inverter.
Referring to the LED "on"
condition, search for an
open point and repair.
Among the three wires of
the transmission cable,
search for the shorted wire
and repair.
Check the wiring on the
inverter terminal block and
correct the improper wiring
point.
: Any of on, flicker or off
*