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DIGITAL INDUSTRIAL CONTROLLER
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Overlap area
When using the 3-point PWM Output, the following controller behaviour results in
the area around the set-point, depending on the setting of the overlap area:
Figure 20: Overlap area for 3-point PWM signal
Adjustable parameters:
T+: Period for switching relay 1 (heating)
T-: Period for switching relay 2 (cooling)
Olp: Overlap zone (heating and cooling)
Funktionsblock 18: 3-Punkt-Schritt-Signal
The 3-point step signal can be used to control motor-driven actuators. In doing so,
TCO is the time needed to move the actuator from one end position to the other.
Adjustable parameters:
Gt: Backlash of the gearbox when shifting from forwards to reverse
Psd: insensitive area (for explanation, refer to Chapter 6.5.4)
TCO: Regulating time (motor running time)
Overlap area negative
(Dead range)
OLP < 0
Setpoint SP
Actual value PV
HeatCool
100 %
Controlled
variable CO
Characteristic
for P-controller
OLP > 0
Setpoint SP
Actual value PV
HeatCool
100 %
Controlled
variable CO
Characteristic
for P-controller
Overlap area positive
(overlap)
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