Rockwell Automation 1772-L8_LW_LWP_LX_LXP,D17726.5.8 User Manual - Manual (Page 47)

Installing Your
Programmable Controller
Chapter 4
4-8
Figure 4.2
Ungrounded ac PowerĆDistribution 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 AllenĆBradley
cat. no. 700ĆN24; for 220/240V ac, use cat. no. 599ĆKA04.
To minimize EMI generation, you should connect a suppression network: for 120V ac, use AllenĆBradley
cat. no. 700ĆN24; for 220/240V ac, use cat. no. 599ĆKA04.
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
EĆstop 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
stepĆdown
transformer
CRM
CRM
CRM
CRM
GND
incoming ac
disc
user dc
supply
to dc I/O devices