Rockwell-automation 1746-HSRV SLC Servo Control Module User Manual Manuel d'utilisateur Page 57

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Vue de la page 56
Publication 1746-6.1.2 - July 2000
5-14
Wiring the SLC Servo Module
by the manufacturer. Those limits for the 845H are a minimum voltage
requirement of 4.75V and a maximum voltage of 5.25V.
To meet the voltage requirement of the encoder and still attain
maximum cable length, you can do the following:
Raise the voltage of the power supply to meet the encoder
requirement without exceeding the 5.25V limit of the SLC Servo
Module, measured at the module.
Increase the gage of the wire connecting the termination panel
to the encoder (12 AWG maximum).
Figure 5.11 shows a circuit equivalent for channel A.
Figure 5.11 Encoder Feedback Equivalent Circuit
IMPORTANT
The term user-side refers to the control circuitry on
the SLC Servo Module card that is powered by
user-supplied power sources and isolated from the
control circuitry powered by the backplane of an SLC
rack.
+5V
+5V
A
A
Control Module
Ch A HI
Ch A LO
Termination Panel
+
-
0.01 microfarads
1746-HCA
768 ohms
768 ohms
221 ohms
Differential
Line Driver
Customer
Encoder
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