Rockwell Automation 1771-QC , D17716.5.25 SER/B SERVO POS - Manual (Page 78)

Installing the Assembly
Chapter 6
6Ć28
Figure 6.16
Connections to a Cat. No. 845NĆSJDN4ĆC Encoder and a Bulletin 1388 dc Servo Controller
Drive
+ -
Tach
2
12303
H
G
F
E
D
C
I
J
A
B
8 to 15V dc
Power Supply
for Input
Circuits
(customer
supplied)
11
10
9
7
6
8
12
13
5
4
3
1
2
15
14
Bulletin 1388
DC Servo
Controller
Drive
P1
P2
Bulletin 1388
Power
Transformer
A3TB1
CRM
Motor
P1 P2
1
Cat. no. 845N -
SJDN4 - C Encoder
27K
1771 - ES
Expander
2
NOTES:
Belden 8725 or equivalent 50ft max)
Belden 8761 or equivalent (50ft max) 1
2
Connect the bulletin 1388 dc servo controller drive and its bulletin 1388
power transformer to the 1771-ES expander as shown in Figure 6.16.
Tachometer input terminal 12 on the 1771-ES expander and terminal 2 on
the drive each connect to a dc common at ground potential; therefore, you
must connect these terminals directly as shown.
Connect the analog output signal from terminal 3 of the 1771-ES
expander to terminal 7 of the drive. Connect the analog return signal from
terminal 4 of the 1771-ES expander to terminals 6 and 8 of the drive.
With this signal orientation, when you connect the tachometer to the drive
with the proper polarity for negative feedback, the signal will also have