Rockwell Automation 1771-QB Linear Pos. - Manual (Page 119)

Chapter
8
8Ć1
Initializing and Tuning the Axes
Before you load an application ladder logic program into the programmable
controller, you should follow the procedures in this chapter to initialize and tune
the movement of each axis. A simple ladder logic program, QB_SETUP,
provided on the accompanying disk, is intended to simplify the initial
integration process. Note that all specific references to data tables in the
following procedures refer to QB_SETUP. If you prefer, you can write your
own program for this process. In any case, initializing and tuning should be
completed for each axis before bringing the module online. The steps are as
follows:
adjust the null on each servo valve
load the ladder logic program and initialize the parameter block
verify the analog output polarity
tune the loop parameters for the axis
copy the new loop parameters for the axis into the data table of the
application program
Important: For these procedures to work, servo valves and motors must be
capable of controlling axis motion according to your requirements. The module
cannot overcome inherent limitations of the proportional valve or axis
mechanisms.
Before you perform these procedures, you must:
disconnect the actuator from the tool or workpiece. If you can’t disconnect
the actuator, make sure that sudden or erratic motion will not result in
equipment damage or personnel injury before continuing.
if the system uses axis overtravel limit switches, verify their operation.
supply power for and wire up the transducer, analog outputs and the I/O
chassis containing the programmable controller and the module. The discrete
inputs and outputs do not have to be powered up or wired in.
Before You Begin