Pacific Scientific OC930, Hardware & Software Reference Manual

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4 Selecting Motor Control
Functionality
Introduction
The SC900 family has three distinct modes of controlling the
motor shaft and three distinct sources for the shaft command:
Modes
•
Torque Control
•
Velocity Control
•
Position Control
Commands
•
Analog Command
•
Incremental Digital Pulse Command
•
Serial Port Command with OC930
The SC930 implements seven of the nine possible combinations
from the above list. The eighth possibility, Serial Port command
torque block, is implemented indirectly and the ninth possibility,
analog command position block is not implemented. The
BlkType
parameter sets most of the overall drive functionality.
But, many other parameters need to be set to insure smooth and
proper operation and this chapter goes over these requirements.
Within these eight combinations of mode and command,
additional parameters allow further specialization. For example,
BlkType = 1 (analog command velocity block) can be further
enhanced to be an emulation of a superior performance clutch
brake with a number of features. See section 4.2.3 for further
details on this example.
Most of the drive’s operating modes can be easily set up using
New Set Up under the File menu or Drive Set Up under the
Drive menu of 930 Dialogue. The others may be set up by using
the Variables screen to change parameters or by changing
appropriate entries in the parameter edit form and down loading
the new configuration. The following sections give the details on
these eight operating modes.
Refer to Appendix C for control block diagrams. Refer to Chapter
6 for additional information on velocity and position loops.
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