Rockwell Automation 1746-QV,D17466.18 OPEN-LOOP VELOCITY CONTL - Manual (Page 7)

Chapter
1
Publication 1746-6.18 April 1998
System Overview
This chapter presents a conceptual overview of how you use the
1746-QV module in an application.
The 1746-QV module is part of an SLC-based open-loop control
system for controlling the speed and placement of an hydraulic ram.
The module accepts an input from a linear displacement transducer
(LDT) and motion profiles that you program into the SLC processor,
and varies its output in the range of
"10V dc. The SLC processor
sends to the module a pair of extend and retract profiles that define
when to accelerate or decelerate hydraulic motion.
The Allen-Bradley Small Logic Controller (SLC) system is a
programmable control system with an SLC processor, I/O chassis
containing analog, digital, and/or special-purpose modules, and a
power supply. The 1746-QV module interfaces your hydraulic ram
and position-monitoring device (LDT) to the ladder sequence in your
SLC processor. The system can be illustrated as follows:
Power
Supply
SLC-500
Processor
Piston-type Hydraulic Cylinder and
Linear Displacement Transducer (LDT)
Analog
Output
"10v dc
Proportional
Valve
Proportional
Amplifier
Axis
Motion
Position
Input
from LDT
HYDRAULIC
RUN
FAULT
LDT/ "10V DC
1746-QV
module
Chapter Objectives
What Is the
1746-QV Module?
What Is an
SLC-500 System?