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Determining Your Type of
Input Power
System module
single point bond bar
Conduit/4-Wire Cable
Ground grid or
power distribution ground
Allen-Bradley PLCs
Before you ground or wire your 1394 system you must determine the
type of 360/480V input power you will be connecting to. The 1394
system is designed to operate in both grounded and ungrounded
environments.
Grounded Power Configuration
As shown in the figure below, the grounded power configuration
allows you to ground your 3-phase power at a neutral point. The 1394
system module has a factory-installed jumper configured for grounded
power distribution. If you determine that you have grounded power
distribution in your plant you do not need to modify your system.
Figure 2.2
Grounded Power Configuration
SERCOS System Module
Status
DANGER
RISK OF ELECTRICAL SHOCK. HIGH VOLTAGE MAY
EXIST UP TO FIVE MINUTES AFTER REMOVING POWER.
U
PE1
Cable clamp around shield
V
PE2
W1
W
V1
U1
Bonded cabinet ground bus
Note: The input power terminal designated PE is electrically common
to the system module single point bond bar.
Connecting Your 1394 SERCOS Interface System
1326 or MP-Series
motor power cable
Shield
2-5
Publication 1394-5.20 — July 2001
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