Rockwell Automation 1746-HSRV SLC Servo Control Module User Manual - Manual (Page 39)

Publication 1746-6.1.2 - July 2000
4-4 Installing Your SLC Servo Module
Grounding the SLC Servo
Module Before you install the rest of the system, you must ground the SLC
Servo Module. All of the shields and signal commons (normally
floating) are tied to earth ground at a single point. Use the EGND
terminal on the termination panel for this purpose.
Figure 4.2 Typical Grounding and Shielding for the SLC Servo Module System
IMPORTANT
Do not connect shields to earth ground at both ends
to avoid causing circuit loops that are susceptible to
radiated and coupled noise.
Drive CMD
Channel A
Channel B
Channel Z
Encoder PWR
Drive
Backplane
Side
Isolated
User
Side
B
a
c
k
p
l
a
n
e
Twisted
pair (x10)
Shielded
twisted
pair (x3)
Overall
cable shield
+24V
RET
Optional
+5V
RET
Axis Axis
User-side power supply
Earth ground
through backplane
Control Module Termination panel User-supplied shielded cable
Encoder
EGND
External power
–15V
1746-HCA cable
see ATTENTION
ATTENTION
!
To avoid unpredictable operation of your SLC Servo
Module use a separate +24V power supply and tie
the +24V return to the +5V return. (The +5V, +15V,
and -15V returns are tied together on the SLC Servo
Module.)