Control Parameters With Pwm And Continuous Controller (Fan Coil); Two-Stage Heating And Cooling; Setpoints - ABB 2CSYK1201C Product Manual

MYLOS Building Automation
®
7.3.5

Control parameters with PWM and continuous controller (fan coil)

With continuous control behaviour and switching PWM controllers the preset control parameters can be used via the
installation type of the heating or air-conditioning system. If different parameters are required, they are set by free
parametrisation. Free parametrisation should only be used if the user has sufficient experience in control technology.
21 °C
The setting "free parametrisation" can be used to set the "proportional range (Xp)" and the "readjust time (Tn)". The
proportional range is above and below the specified setpoint and determines the speed of the control.
The readjust time is three times the delay time (the delay time is determined by the inflectional tangent of the heating
curve of the room. With both settings the slower the overall system the greater the values required.
7.3.6

Two-stage heating and cooling

In specific instances such as when using underfloor heating, it may be necessary to install a quick additional stage
for the heat control in order to warm up the room rapidly. When the room thermostat is pre-set to "supplementary-
stage heating enabled", it has a second heating system with switching control (1-bit) or a "quasi-continuous" control,
which is controlled with the 1-byte values 0% and 100%.
The parameters "gap of additional stage" and "Hysteresis (one-sided)" enable you to specify when the additional
stage switches on and off.
For example, if the setpoint is 18 °C and the hysteresis 0.5 K (one-sided) for the additional stage, the controller
switches on at 18 °C and off at 18.5 °C.
The same settings as for the additional stage heating also apply for the additional stage cooling, except that for
cooling an additional cooling stage is activated if an adjustable temperature is exceeded to cool the room faster.
Because some actuators close (open without power) at a 1-bit value of "1" or a 1-byte value of "255" and open at
"0", the direction of the control value can be changed with "invert control value".
7.4

Setpoints

The ambient temperature controller can be operated with dependent or individual setpoints. The two options are
explained in more detail below.
72 Planning and use | MYLOS
®
100%
0%
15°C
T
Wendepunkt
Tn = 3 * Tu
Tu
Tu = Verzugszeit
Tn = Nachstellzeit
Building Automation
Planning and use
Xp=Proportionalbereich
Xp = 8 K
Xp = 6 K
Xp = 4 K
Xp=2 K
T
25°C
21°C
Sollwert
Istwert
t