Copley Controls Accelnet Plus BEL Series User Manual page 17

Accelnet & Stepnet Plus Panels User Guide
B A
ASIC TTRIBUTES OF
Control loops (and servo control loops in general) share several common attributes:
Loop Attribute
Command input
Limits
Feedback
Gains
Output
A C L
LL ONTROL OOPS
Description
Every loop is given a value to which it will attempt to control. For example, the velocity
loop receives a velocity command that is the desired motor speed.
Limits are set on each loop to protect the motor and/or mechanical system.
The nature of servo control loops is that they receive feedback from the device they are
controlling. For example, the position loop uses the actual motor position as feedback.
These are constant values that are used in the mathematical equation of the servo
loop. The values of these gains can be adjusted during drive setup to improve the loop
performance. Adjusting these values is often referred to as tuning the loop.
The loop generates a control signal. This signal can be used as the command signal to
another control loop or the input to a power drive.
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