Samson TROVIS 5573 - Page 151

EB 5573 EN 16-69
Appendix A (conguration instructions)
16.4.5 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.
The condensate accumulation control function can only be activated when the control circuit
concerned is controlled using a PI algorithm (three-step control).
Functions Default Conguration
Control mode 1 CO1,2,4->F12-1
Limitation of set point deviation for
OPEN signal
0
3.0°C
CO1,2,4->F13-1
Max.systemdeviation:3.0to10.0°C
16.4.6 Three-step control
Theow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rst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
inuencedbythe'ResettimeTn'(thepauselengthincreasesasTnincreases).The'Valve
transittimeTY'speciesthetimerequiredbythevalvetotravelthroughtherangeof0to
100%.
Functions Default Conguration
Control mode 1
2.0
120s
0s
35s
CO1,2,4->F12-1,Rk_
KP (gain): 0.1 to 50.0
Tn(resettime):1to999s
TV (derivative-action time): do not change the
value.
TY(valvetransittime):15,…,240s
Note