Rockwell Automation 1746-HSRV SLC Servo Control Module User Manual - Manual (Page 27)

Publication 1746-6.1.2 - July 2000
2-4 Selecting Power Supplies, Encoders, and Drives
Example of the Calculations for User-Side Current Requirements
In this example, the system includes:
•
One seven-slot modular rack
•
One 1747-L541 CPU module
•
One 1746-IB8 DC input module with eight inputs @ +24V
•
One 1746-OV8 DC output module with eight outputs @ +24V
•
An SLC Servo Module system that contains:
•
Two SLC Servo Modules
•
Two termination panels
•
Two Allen-Bradley 845H encoders
•
Six fast inputs
•
Two fast outputs
Use the table below to find the current requirements of the devices
that draw user-side power.
Using Fast Inputs and
Outputs The fast I/O (FIN1through FIN3, and FOUT1) are 24V DC compatible
and are used with a user-side +24V power supply. Review potential
Device +5V +15V –15V +24V
1746-IB8 0 0 0 .064A
1746-OV8 0 0 0 .800A
SLC Servo
Module .150A .030A .030A 0
Estop circuitry 0 0 0 .100A
6 fast inputs 0 0 0 .015A
2 fast outputs 0 0 0 .100A
845H encoder .200A 0 0 0
845H encoder .200A 0 0 0
Total = .700A Total = .060A Total = .060A Total = 1.079A