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instabus KNX/EIB System
Sensor
Predefined control parameters for the heating or cooling stage and, if applicable, also for the additional stages are
adjusted via the "Type of heating" or "Type of cooling" parameters These fixed values correspond to the practical
values of a properly planned and executed air conditioning system and will result in an ideal behaviour of the
temperature control. The following types can be set for heating or cooling.
for heating control
Type of heating
• Hot-water heating
• Underfloor heating
• Electrical heating
• Blower convector
• Split-unit *
for cooling control
Type of cooling
• Cooling ceiling
• Blower convector
• Split-unit *
*: split mobile climate control unit,
**: for smaller, fast-working heaters (e.g. higher flow temperature) PWM cycle time 2 – 3 minutes.
If the "Type of heating" or "Type of cooling" parameters are set to "via control parameters" it will be possible to
adjust the control parameters manually. The control may be considerably influenced by presetting the proportional
range for heating or for cooling ('P' part) and the reset-time for heating or for cooling ('I' part).
Notes:
• Even minor adjustments of the control parameters will lead to a noticeably different control behaviour.
The adaptation should start with the control parameter setting for the corresponding heating or cooling system
according to the fixed values mentioned above.
Variable
PI control algorithm: Actuating variable y = K x
P control algorithm: Actuating variable y = K x
Parameter setting
P
small proportional range
P
large proportional range
T
short reset-time
N
T
long reset-time
N
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default values
Proportional range Reset-time
5 Kelvin
5 Kelvin
4 Kelvin
4 Kelvin
4 Kelvin
default values
Proportional range Reset-time
5 Kelvin
4 Kelvin
4 Kelvin
y = K x
[1 + (t / T
d
2 K x
d
K x
(Proportional part)
d
T
N
[1 + (t / T
d
d
Effect
large overshoot in case of setpoint changes (possibly permanently), quick
adjustment to the setpoint
no (or small) overshoot but slow adjustment
fast compensation of control deviations (ambient conditions), risk of
permanent oscillations
slow compensation of control deviations
recommended
type of PI control: PWM cycle time
150 minutes
continuous / PWM 15 minutes **
240 minutes
100 minutes
90 minutes
continuous
90 minutes
recommended
type of PI control: PWM cycle time
240 minutes
90 minutes
continuous
90 minutes
)]
N
x
: Regeldifferenz x
d
P = 1/K : parametrierbarer Proportionalbereich
K = 1/P : Verstärkungsfaktor
T
: parametrierbare Nachstellzeit
N
t
)];
By deactivating the reset-time (setting = "0"):
N
recommended
PWM
15 – 20 min.
PWM
10 – 15 min.
---
PWM
10 – 15 min.
recommended
PWM
15 – 20 min.
---
PWM
10 – 15 min.
= x
- x
d
soll
07 /17
Subject to change without notice
ist
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