6-132
6.6.5.2-2 Triple-multiplex direct parallel connection
・ For safety, design the external circuit so that all inverter units should coast to stop when an alarm occurs (30x
operation).
Circuit configuration for the case where operation with reduced number of units is not conducted, using
three units in Direct Parallel Connection System, is shown below.
The relay circuit for the case of two units used in direct parallel connection is the same as in the diagram
below if operation with reduced number of units is not conducted.
OPC-VG1-TBSIS
o33=2
o34=2
o50=0
TX
RX
OPC-VG1-TBSIS
o33=2
o34=2
o50=1
TX
RX
OPC-VG1-TBSIS
o33=2
o34=2
o50=2
TX
RX
*Be sure to connect inverter units to the DC common.
ALM
30AX
30C
30A
<INV1>
ALM
30C
30A
<INV2>
RDY
Y5A
Y5C
<INV1>
RDYX
RDY
Y5A
Y5C
<INV3>
FX RX
ALM
30C
30A
<INV3>
RDY
Y5A
Y5C
<INV2>
RDYX
***
: Shows external interface
signal
Alarm relay output Inverter ready to run
Run forward
command
Run reverse
command
Forward
command
Reverse
command
Figure 6.6.7 Basic Configuration (Without Operation in Reduced Number of Units) for
Direct Parallel Connection System Using Three Inverters
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