8.6
Three-step control
The flow temperature can be controlled using a PI algorithm. The valve reacts to pulses that the
controller sends when a system deviation occurs. The length of the first pulse, in particular, de-
pends on the extent of the system deviation and the selected 'Gain KP' (the pulse length in-
creases as KP increases). The pulse and pause lengths change continuously until the system de-
viation has been eliminated. The pause length between the single pulses is greatly influenced by
the 'Reset time TN' (the pause length increases as TN increases). The 'Valve transit time
TY-OPEN' specifies the time required by the valve to travel through the range of 0 to 100 %.
Functions
WE
Configuration
Three-step control
ON
2.0
120 s
0 s
45 s
HC1–CO1–12 = ON
Gain KP / 0.1 to 50.0
Reset time TN / 0 to 999 s
Derivative-action time TV / 0 to 999 s
Valve transit time TY-OPEN / 10 to 240 s
Three-step control
ON
2.0
120 s
0 s
45 s
DHW–CO4–12 = ON
Gain KP / 0.1 to 50.0
Reset time TN / 0 to 999 s
Derivative-action time TV / 0 to 999 s
Valve transit time TY-OPEN / 10 to 240 s
8.7
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 flow temperature exceeds the set point by T = 0.5 x 'Hysteresis', the
boiler is switched off again. The greater the value you choose for 'Hysteresis', the less the
switching frequency will be. By setting the 'Min. 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
WE
Configuration
Three-step control
ON
5.0 °C
120 s
120 s
HC1–CO1–12 = OFF
Hysteresis / 2.0 to 10.0 °C
Min. ON time / 0 to 600 s
Min. OFF time / 0 to 600 s
EB 5610 EN
83
System-wide functions
Summary of Contents for trovis 5600
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