Ungrounded Power Configuration - AB Quality Allen-Bradley 1394 User Manual

Conduit/4-Wire Cable
Ground grid or
Power distribution ground
Wiring System, Axis, and Shunt Modules, and Motors (for all systems)

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
ground jumper procedures for the system module you need to
configure.
Figure 3.3
Ungrounded Power Configuration
Status
DANGER
RISK OF ELECTRICAL SHOCK. HIGH VOLTAGE MAY
EXIST UP TO FIVE MINUTES AFTER REMOVING POWER.
U
PE3 (drain/shield)
PE2 (wire 8)
V
W1 (wire 3)
V1 (wire 2)
W
U1 (wire 1)
PE
PE1
!
1326 motor
power cable
ATTENTION: Ungrounded systems do not reference
each phase potential to a power distribution ground.
This can result in an unknown potential to earth ground.
3-7
Publication 1394-5.0 — May 2000