Rockwell Automation 1771-QC , D17716.5.25 SER/B SERVO POS - Manual (Page 80)

Installing the Assembly
Chapter 6
6Ć30
Figure 6.17
Shielded Cable Grounding Connections
1771 -ES
Expander 8 to 15V dc
Power Supply
for input
Circuts
(customer
supplied)
27K
Motor
Encoder
Tach
Bulletin 1388
DC Servo
Controller
Drive
Twisted pair
with shield
or conduit
8 AWG wire to
central ground bus
I/O Chassis
Ground Bus
Shielded cables are not
required for these discrete
inputs. However, they can
improve noise immunity.
2
1
3
NOTES:
Belden 8761 or equivalent.
Belden 8723 or equivalent.
Belden 8725 or equivalent.
12304
Drive Disable
+ 15V dc
For DAC
(Customer Supplied)
+ Return-
1
1
1
1
2
3
Connecting AC Power
Figure 6.18 shows ac power connections. Incoming ac connects to the
primary of the bulletin 1388 power transformer. Both the 120V secondary
and the 35.5V secondary connect to the bulletin 1388 dc servo controller
drive.
Incoming ac also connects to the primary of an isolation transformer. The
secondary of the isolation transformer connects to:
the power supply for the input circuits
the power supply for the I/O chassis backplane
the power supply for the analog output circuit
Figure 6.18 shows a grounded ac system; the low side of the isolation
transformer is connected to the central ground bus. Figure 6.18 also