Mixing Valve Control - Siemens Albatros2 RVS46 Series User Manual

mixing valve control

Mixing valve boost
Actuator:type
Switching differential 2-
pos
Actuator: running time
Mixing valve Xp
Mixing valve Tn
18/26
Siemens Schweiz AG
HVAC Products
TV
max
akt
TVmin
min
0 10 20 30
TVw Current flow temperature setpoint
TVmax Flow temperature setpoint maximum
Tvmin Flow temp setpoint min
Line no. Operating line
2130 Mixing valve boost
2132 Actuatortype
2133 Switching differential 2-pos
2134 Actuator running time
2135 Mixing valve Xp
2136 Mixing valve Tn
For mixing, the actual value of the boiler flow temperature must be higher than the
required setpoint of the mixing valve flow temperature since otherwise that temperature
cannot be controlled. The controller generates the boiler temperature setpoint based on
the increase set here and the current flow temperature setpoint.
Selection of the type of actuator determines the way the control action impacts the type
of mixing valve actuator used.
For the 2-position actuator, the 2-position switching differential must also be adapted.
This is not required when using 3-position actuators.
Setting the actuator running time for the mixing valve used.
The proportional band defines within which change of the control variable ∆x (∆T of the
flow) the whole correcting span y (valve travel) is traversed.
The smaller the proportional band, the greater the change of the manipulated variable
∆y at a given change of the controlled variable ∆x.
The integral action time is the period of time the controller's I-part would require to
produce the same change of the manipulated variable as the P-part
An adjustment of the integral action time changes the valve's rate of response.
The longer the integral action time Tn, the slower the response of the controlled
system.
y
Tn
x
User Manual OEM
The settings in detail
TVw
40 50 60 70
1
Xp
t
t
TVmax
°C
80 90 100
CE1U2353en01a
22. November 2006