TUNING THE CONTROL LOOPS 6-25
SB1391 Hardware and Setup Guide - Document revision no. 1.14
In a dual loop application two encoders are used, one mounted on the motor axis and the other on
the load. (The load encoder can be linear for a linear stage application or rotary for a rotary load
application).
Examples of applications that benefit from dual loop control:
• Linear stage drive with a screw.
• Printer drum drive with a flexible belt.
• A high-inertia antenna driven by a high-ratio gear motor.
In all these examples, the use of dual loop control will improve the performance of the system.
The dual loop control block diagram is shown in FIGURE 6-19.
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