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2-6
Connecting Your 1394 SERCOS Interface System
System module
single point bond bar
Conduit/4-Wire Cable
Ground grid or
power distribution ground
Publication 1394-5.20 — July 2001
Ungrounded Power Configuration
As shown in the figure below, the ungrounded power configuration
does not allow for a neutral ground point. If you determine that you
have ungrounded power distribution in your plant, you need to move
the factory-installed jumper to the ungrounded power distribution
position to prevent electrostatic buildup inside the 1394. Refer to the
instructions on page 7 for 5 and 10 kW system modules, and starting
on page 8 for 22 kW system modules.
Figure 2.3
Ungrounded 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
ATTENTION
!
Note: The input power terminal designated PE is electrically common
to the system module single point bond bar.
1326 or MP-Series
motor power cable
Shield
Ungrounded systems do not reference each
phase potential to a power distribution ground.
This can result in an unknown potential to
earth ground.
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