Two-Level Controller With Relative Thresholds; Combination Of The Operating Modes Absolute And Relative Thresholds - Baumuller b maXX BM3000 Operating Manual

4.7
Controllers

4.7.5.3 Two-level controller with relative thresholds

In this operating mode the actual value two-level controller is compared with an upper and
lower switching threshold, which is calculated from the momentary value of the parameter
number
value, but follows the momentary value, which parameter number is specified in
Relative compare value.
h(t)
y
Figure 169:
m The switching hysteresis arises from the difference between the lower and upper
m The two-level-controller with relative thresholds is activated by bit 1 = 1 in parameter
m The two-level controller switches off, if the following is valid: 
m The two-level controller switches on, if the following is valid: 

4.7.5.4 Combination of the operating modes absolute and relative thresholds.

Both threshold types can be activated commonly, in order to limit and monitor the behav-
ior of the relative threshold by a constant, absolute threshold controller.
508 Parameter manual b maXX BM3000
Document no.: 5.12001.07
of 820
Z152.4–
Relative compare value. Therefore the switching point is not a definite
rel. lower threshold
Two-level controller with relative thresholds
switching threshold.
Z152.1–
mode two-level controller.
Two-level-controller input  Two-level-controller relative upper switching threshold
Two-level-controller input  Two-level-controller lower switching threshold
rel. upper threshold
rel. compare value
t
t
Z152.4–
Baumüller Nürnberg GmbH