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During closed loop operation, there are three ways to use the PID
controller and setpoint and feedback signals:
1.
1 setpoint and 1 feedback
2.
1 setpoint and 2 feedbacks
3.
2 setpoints and 2 feedbacks
1 Setpoint and 1 Feedback
If only one setpoint and one feedback signal are used, parameter 418,
Setpoint 1 will be added to the remote reference, if a remote reference
is used. The sum of the remote reference, if any, and Setpoint 1
becomes the resulting reference, which will then be compared with the
feedback signal.
1 Setpoint and 2 Feedbacks
As above, parameter 418, Setpoint 1, will be added to the remote
reference, if a remote reference is used. Depending on the feedback
function selected in parameter 417, Feedback Function, the two
feedback signals will be compared to the setpoint. A description of the
individual feedback functions is given in parameter 417, Feedback
Function.
2 Setpoints and 2 Feedbacks
Parameter 418, Setpoint 1, is the setpoint for zone 1. Feedback for
zone 1 is the sum the feedback signals at terminal 53 and Bus
Feedback 1. Parameter 419, Setpoint 2, is the setpoint for zone 2.
Parameter 417, Feedback Function, selects whether the drive will
attempt to have both feedback signals be at least equal to their
respective setpoints (2 zone min.) or be at most equal to their respec-
tive setpoints (2 zone max.).
