EQJW146F002 EN
109
System-wide functions
8.5 Condensate accumulation control
Activate the damping 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 unaffected.
The condensate accumulation control function can only be activated when the control circuit
concerned is controlled using a PI algorithm (three-step control).
Functions
WE
Configuration
Control mode
1
CO1, 2, 4 > F12 - 1
Damping
0
3.0 °C
CO1, 2, 4 > F13 - 1
Max. system deviation: 3.0 to 10.0 °C
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 'KP (gain)' (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 'Tn (reset time)' (the pause length increases as TN increases). The 'TY (valve
transit time)' specifies the time required by the valve to travel through the range of 0 to
100 %.
Functions
WE
Configuration
Control mode
1
2.0
120 s
0 s
35 s
CO1, 2, 4 > F12 - 1
KP (gain): 0.1 to 50.0
Tn (reset time): 1 to 999 s
TV (derivative-action time): Do not change this
value!
TY (valve transit time): 15, … , 240 s
Note
