Samson 5476 - Manual (Page 59)

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 control function can only be activated when 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