Manual

Installing the Assembly
Chapter 6
630
Figure 6.17
Shielded
Cable Grounding Connections
1771-ES
Expander
8to15V dc
PowerSupply
forinput
Circuts
(customer
supplied)
27K
Motor
Encoder
Tach
Bulletin1388
DCServo
Controller
Drive
Twistedpair
withshield
orconduit
8AWGwireto
central ground bus
I/OChassis
GroundBus
Shieldedcablesarenot
requiredforthesediscrete
inputs.However,theycan
improvenoiseimmunity.
2
1
3
NOTES:
Belden8761orequivalent.
Belden8723orequivalent.
Belden8725orequivalent.
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