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7.5 Condensate accumulation control
Activate the Limitation of the system deviation for OPEN signal function to start up condensate
accumulation plants, in particular to avoid problematic excess temperatures. The controller re
-
sponse to set point deviations which cause the primary valve to open is attenuated. The control
-
ler response to set point deviations which cause the control valve to close remains unaffected.
Function
WE Configuration
Limitation of the system deviation for
OPEN signal RK1/RK2
OFF
2 °C
FB11/FB12 = ON
Maximum system deviation / 2 to 10 °C
Note!
The condensate accumulation controlfunction can only be activatedwhen no on/off control has
been configured, i.e. when FB10 = ON or FB17 = ON.
7.6 Three-step control
The flow temperature 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, de-
pends 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 in-
fluenced 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
Three-step control for RK1 ON
0.5
200 s
90 s
2 x T
Y
FB10 = ON
K
P
(proportional gain) / 0.1 to 50
T
N
(reset time) / 1 to 999 s
T
Y
(valve transit time) / 15 to 240 s
Pump lag time / 1 x T
Y
to 10 x T
Y
Three-step control for RK2 ON
0.5
60 s*
30 s*
FB17 = ON
K
P
(proportional gain) / 0.1 to 50
T
N
(reset time) / 1 to 999 s
T
Y
(valve transit time) / 15 to 240 s
* WE applies to systems Anl 5, 6; T
N
= 200 s, T
Y
= 90 s applies for system Anl 4
EB 5476 EN 59
System-wide functions