Wiring The Power Distribution Modules - Mitsubishi MELESEC-ST User Manual

10 MOUNTING AND INSTALLATION

10.4.2 Wiring the power distribution modules

Head module
External
SYS. power
100VAC supply * *
1 4
Fuse
AC
AC
DC
External
AUX. power
supply *
4
Fuse *
AC
DC
External
AUX. power
supply *
4
Fuse *
AC
DC
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This section provides the example of connecting the power wires of the power
distribution modules to the base modules.
Bus refreshing module
(Shield grounding)
*
2 +24V(SYS)
24G(SYS)
2
24G(AUX)
+24V(AUX)
2 24G(AUX)
+24V(AUX)
1: When using multiple bus refreshing modules in the system, supply 24VDC
external power from one external SYS. power supply to each bus refreshing
module (SYS. input).
2: Provide safety circuits such as external fuses to prevent smoking or ignition that
may occur if a load current higher than the rating or a long-duration overcurrent
caused by a load short circuit, etc. flows in the power distribution module.
3: Use the thickest possible 24VDC power wires and be sure to twist them from the
connected terminals.
4: Use different external power supplies for the external SYS. power supply and
external AUX. power supplies.
POINT
When using more than one external power supply, firstly input external auxiliary
power and then input system external power. If firstly system external power is
input, a head module cannot recognize slice modules.
Bus refreshing module
Slice module
*
3
*
3
*
3
MELSEC-ST
Power feeding module
Slice module Slice module
(Shield grounding) (Shield grounding)
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