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* Only in systems Anl 4 to 7
Note!
The control mode is configured separately in Co2 -> Fb14 or Fb15 for the separate heating cir-
cuit in systems Anl 1 to 3 (Co5 -> Fb13 = ON).
8.11.1 Three-step control
The set point can be controlled using a PI algorithm. The valve reacts to pulses that the controller
emits when a system deviation occurs. The length of the first pulse. in particular, depends on the
extent of the system deviation and the selected
Proportional gain K
P
(the pulse length increases
as K
P
increases). The pulse and pause lengths change continuously until the system deviation
has been eliminated. The pause length between the single pulses is greatly influenced by the
Re-
set time T
N
(the pause length increases as T
N
increases).
The
Transit time T
Y
specifies the time required by the valve to travel through the range of 0 to
100 %.
8.11.2 On/off control
The output signal of the controller is switched on or off.
Depending on the controlled variable, the output signal is switched on or off when the tempera-
ture falls below or exceeds the required set point by T = 0.5 x
Hysteresis. The greater the Hyster-
esis selected, the less the signal is switched on and off. The Minimum activation time and Mini-
mum deactivation time determine the time interval between changes in the output signal.
8.11.3 Continuous control
The set point can be controlled using a PID algorithm. The valve receives an analog 0 to 10 V
signal from the controller. The proportional component causes an immediate change in the 0 to
10 V signal when a system deviation occurs (the greater the K
P
, the greater the change). The in-
tegral-action component only comes into effect when a certain time has passed: T
N
stands for
the time passing until the integral-action component has changed the output signal to the extent
that the proportional component directly changed the signal (the greater the T
N
, the slower the
rate of change). The derivative-action component determines how strongly a change in the sys-
tem deviation affects the output signal (the greater the T
V
, the stronger the change).
58
EB 5474 EN
System-wide functions
Содержание TROVIS 5474
Страница 79: ...System Anl 3 System Anl 4 EB 5474 EN 79 Electrical connection...
Страница 80: ...System Anl 5 System Anl 6 80 EB 5474 EN Electrical connection...
Страница 127: ...EB 5474 EN 127 Index Key number 1732...
Страница 129: ...EB 5474 EN 129...
Страница 130: ...130 EB 5474 EN...