Assembly and Installation
Chapter 3
339
Figure 3.35
Power Distribution with Master Control Relay, Ungrounded System
Incoming
AC
H
FUSE
To Motor
Starters
H
Back Panel
Ground Bus
Enclosure
Wall
Grounding Electrode
Conductor to
Connect
When
Applicable
Equipment
Grounding
Conductors
User DC
Supply
CRM
To DC I/O
Devices
+
-
Output
Device
Input
Device
PC
Power Supply
CRM
Start
Use any number of E-Stop
switches in Series
CRM
CRM
1
4
H
3
H
2
Isolation/
X
1
X
2
To minimize EMI generation, connecting a supression network is recommended: for 120V AC,
Allen-Bradley cat. no. 1691-N2; for 220/240V AC, Electrocube part no. RG 1676-13.
To minimize EMI generation, connecting a supression netwrok is recommended: for 120V AC,
Electrocube part no. RG 1676-14; for 220/240V AC, Electrocube part no. 1676-28.
1
2
CRM
FUSE
1
2
1LT
2LT
F
U
S
E
F
U
S
E
F
U
S
E
Disconnect
Step Down
Transformer
Earth Ground
(Grounding
Electrode
System)
10131I
L
1
L
2
L
3
IL
3
IL
2
IL
1
L
1
L
2
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