Rockwell Automation 1746-QS,D17466.19 SYNCHRONIZED AXES MODULE - Manual (Page 17)

Chapter
4
Publication 1746-6.19 March 1998
Tuning an Axis with the
Hydraulic Configurator
We cover these topics:
•
Before You Begin
•
Finding the Value of the Null Drive
•
Moving the Axis to Set Offset, Scale, Extend and Retract Limits
•
Getting Ready to Tune the Axes
•
Tuning Each Axis
•
Finding the Value of the Dead Band Eliminator
•
Saving Parameters
ATTENTION: Great care must be taken to avoid accidents when
starting the module for the first time. The most common accident is
a runaway, where the module tries to move the axis to a position
beyond the physical limits, or in the wrong direction while in
closed-loop control.
When the module is first turned on, parameters are set to default
values. You must change these parameters (with the Hydraulic
Configurator) to operate the module in your application.
ATTENTION: Do not attempt to operate the module in closed-loop
mode until EXTEND and RETRACT limits have been determined
and initialized in the module using the Hydraulic Configurator.
Before starting, be sure that:
1. Hydraulic Configurator is communicating with the module
2. Important: You have identified the type of LDT output. To Do this:
– Double-click the Config word in the screen’s PARAMETER section.
– Click the transducer type that matches your LDT.
– Disable simulate mode.
Do this by removing the
nfrom its check box in the Config word.
– Leave the other selections at default.
3. LDTs are connected and powered up
The Null Drive compensates for axis drift.
This procedure requires operating the module in open-loop mode
with drive outputs connected to the amplifier. In this procedure,
you will increase the drive output until the axis stops drifting. Then
you will initialize that value in the module with an “N” command.
Chapter Objectives
Before You Begin
Finding the Value
of the Null Drive