Installing Your
Programmable Controller
Chapter 4
4-8
Figure 4.2
Ungrounded
ac
PowerDistribution
System
with
Master
Control
Relay
L1
L2
L3
1FU
2FU
3FU
H
FUSE
L1
L2
L3
H
+
–
10301
L
N
1
1
4
H
3
H
2
X
1
X
2
1
2
3
4
FUSE
1
2
3
4
1LT
2LT
To minimize EMI generation, you should connect a suppression network: for 120V ac, use AllenBradley
cat. no. 700N24; for 220/240V ac, use cat. no. 599KA04.
To minimize EMI generation, you should connect a suppression network: for 120V ac, use AllenBradley
cat. no. 700N24; for 220/240V ac, use cat. no. 599KA04.
For a power supply with a groundable chassis, this represents connection to the chassis only. For a power
supply without a groundable chassis, this represents connection to both the chassis and the GND terminal.
In many applications, a second transformer provides power to the input circuits and power supplies for
isolation from the output circuits.
output module
wiring arm
input module
wiring arm
input device
output device
use any number of
Estop switches in series
CRM
I/O chassis
power supply
start
to motor starters
enclosure wall
grounding electrode
conductor to groundi
electrode system
grounding
electrode
conductors
connect when applicable
backpanel
ground bus
stepdown
transformer
CRM
CRM
CRM
CRM
GND
incoming ac
disc
user dc
supply
to dc I/O devices
