Three-Step Control; On/Off Control - Samson TROVIS 5433 Mounting And Operating Instructions

7.6

Three-step control

The flow temperature can be controlled using a PI algorithm. The valve reacts to pulses that
the controller emits upon an existing system deviation. The length of the first pulse, in particu-
lar, depends on the extent of the system deviation and the selected Proportional gain K
pulse length increases as K
til the system deviation has been eliminated.
The pause length between the single pulses is greatly influenced by the Reset time T
pause length increases as T
by the valve to travel through the range of 0 to 100 %.
In system Anl 5, two control valves are controlled. Consequently, the control mode needs to
be set for the DHW circuit as well.
Functions
Control mode
Control mode DHW
7.7

On/off control

The flow temperature can be controlled, for example, by activating and deactivating a
boiler. The controller switches on the boiler when the flow temperature falls below the set
point by T = 0.5 x hysteresis . When the set point is exceeded by T = 0.5 x hysteresis , the
boiler is switched off again. The greater the value you choose for Hysteresis , the lower will
be the activation/deactivation frequency. By setting the Minimum ON time , an activated
boiler remains switched on during this period regardless of the flow temperature fluctuations.
Similarly, a deactivated boiler will remain switched off regardless of the flow temperature
fluctuations if the Min. OFF time has been specified.
Functions
Control mode
increases). The pulse and pause lengths change continuously un-
P
increases). The Valve transit time T
N
WE Configuration
1 CO-SYS -> F05 - 1
2.0 K (proportional gain) / 0.1 to 50.0
P
120 sec T (reset time) / 0 to 999 sec
N
45 sec T (valve transit time) / 10 to 240 sec
Y
1 CO2 -> F11 - 1
2.0 K (proportional gain) / 0.1 to 50.0
P
120 sec T (reset time) / 0 to 999 sec
N
45 sec T (valve transit time) / 10 to 240 sec
Y
WE
1
5 °C
120 sec
120 sec
specifies the time required
Y
Configuration
CO-SYS -> F05 - 0
Hysteresis / 2 to 10 °C
Min. ON time / 0 to 600 sec
Min. OFF time / 0 to 600 sec
System-wide functions
(the
P
(the
N
EB 5433 EN
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