Note: The condensate accumulation control function can only be activated when no on/off
control has been configured, i.e. when CO1, 2, 3, 4 -> F12 - 1 applies.
7.6 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 particu-
lar, 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 un-
til the system deviation has been eliminated. The pause length between the single pulses is
greatly influenced by the
Reset 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 %.
Functions
WE Configuration
Control mode
three-step/0 to 10 V
1
2.0
120 sec
45 sec
CO1, 2, 3, 4 -> F12 - 1, Rk_
K
P
(proportional gain) / 0.1 to 50.0
T
N
(reset time) / 1 to 999 sec
T
Y
(valve transit time) / 5, 10, 15, …, 240 sec
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 the
activation/deactivation frequency will be. 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
WE Configuration
Control mode
three-step/0 to 10 V
1
5 °C
2 min
2 min
CO1, 2, 3, 4 -> F12 - 0
Hysteresis / 1 to 30 °C
Min. ON time / 0 to 10 min
Min. OFF time / 0 to 10 min
98 EB 5579 EN
System-wide functions
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