Rockwell Automation 1771-QC , D17716.5.25 SER/B SERVO POS - Manual (Page 202)

Chapter
9
9Ć1
Integrating Axes
You must perform the procedures in this chapter before you have the
servo positioning assembly in service: that is to help ensure that axes
respond correctly to commands from the servo positioning assembly, and
that adequate feedback is provided to the 1771-ES expander module.
You must enter the parameter block before you perform these integration
procedures. In addition, the ladder diagram program for the axis must be
loaded in the PC.
Important: For these procedures to work, servo drives and motors must
be capable of controlling axis motion according to your requirements.
The servo positioning assembly cannot overcome inherent limitations
of drives, motors, or axis mechanisms.
We present axis integration procedures in the order in which you must
perform them:
Open-Loop Procedure - You disconnect the 1771-ES expander from
the servo drive to open the positioning loop, and use a battery box to
supply drive input. You check phasing of drive input and axis
feedback. You check axis motion for smoothness and response.
Closed-Loop Procedure - You close the axis positioning loop, and
check axis response to commands from the 1771-ES expander.
Tachometer Calibration - You must perform this procedure to ensure
proper functioning of the loss-of-feedback detection feature.
The following procedure requires a battery box to supply command
voltage to the axis drive. If a commercial battery box is not available, you
can make one according to the circuit of Figure 9.1. A 9-volt battery, a
10K ohm variable resistor, and a 2-pole 3-position switch are required.
(You can use a dpdt toggle switch with a center off position.)
You can connect a voltmeter across the battery box output as shown to
measure output voltage.
Figure 9.1
Diagram of Battery Box
Chapter Objectives
OpenĆLoop Procedure