Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 323)

Section 5B
9/440HR CNC/Drive System
5B-33
Grounded vs Ungrounded Three- phase
The 9/440HR CNC/Drive comes from the factory set for three--phase
grounded systems. If your facility uses an ungrounded three--phase
360/480 volt system, you must move a jumper in the 9/440HR system
module. This jumper will connect an internal resistor that helps keep high
voltage static, that can be typical of ungrounded three phase systems, from
building up in the system module.
Jumper Setting Three Phase Power
J27 to J26 (factory setting) Grounded system
J27 to GND3 Ungrounded systems
Figure 5B.19
Three- phase Jumper
9/440HR System Module
Open cover
J2
6
J2
7
G
N
D
3
Wire Jumper