Condensate Accumulation Control; Three-Step Control - Samson TROVIS 5573 Mounting And Operating Instructions

System-wide functions

8.5 Condensate accumulation control

Activate the limitation of set point deviation for OPEN signal function to start up condensate
accumulation plants, in particular to avoid problematic excess temperatures. The controller
response to set point deviations which cause the primary valve to open is attenuated. The
controller response to set point deviations which cause the control valve to close remains un-
affected.
Note
The condensate accumulation control function can only be activated when the control circuit
concerned is controlled using a PI algorithm (three-step control).
Functions
Control mode
Limitation of set point deviation for OPEN
signal

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 particu-
lar, depends on the extent of the system deviation and the selected 'Gain KP' (the pulse
length increases as KP increases). The pulse and pause lengths change continuously until the
system deviation 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' specifies the time required by the valve to travel through the range of 0 to
100 %.
Functions
Control mode
90
WE Configuration
1 CO1, 2, 4 > F12 - 1
0 CO1, 2, 4 > F13 - 1
3.0 °C Max. system deviation: 3.0 to 10.0 °C
WE Configuration
1 CO1, 2, 4 > F12 - 1, HC_
2.0 KP (gain): 0.1 to 50.0
120 s Tn (reset time): 1 to 999 s
0 s TV (derivative-action time): do not change the
value.
35 s
TY (valve transit time): 15, ... , 240 s
EB 5573 EN