sauter Equitherm EQJW 125, Руководство пользователя

Страница: 22 / 74

EQJW 125: Heating controller
Commissioning
7001029003 A
© Fr. Sauter Ltd.
21
bus or a setting via the Modbus have priority 2; (iii) the settings via the binary
input have priority 3. The settings on the EGS 52/15 room operating unit have
the lowest priority. If the setpoint for the room temperature is altered via the
setpoint adjuster of the EGS 52/15 or EGT 333 room operating unit, this
causes a change in the actual value for the room temperature at the sensor
input of the EQJW 125. This adjusts the flow temperature and, therefore, the
heating output for the room.
Room temperature connection
A room temperature sensor (resistance sensor Ni1000 or device bus) is a
requirement for this function. The flow temperature is changed, in divergence
from the setpoint according to the heating characteristic, if the room
temperature in the reference room diverges from the room setpoint. The
change in the flow temperature is limited to a maximum of ± 30K.
Scanning time for room temperature if connected
When the room temperature connection is active, this SERVice parameter
can be used to set a period within which the flow setpoint may be altered
once only. A higher value is better for unresponsive buildings and heating
systems than for light construction types with responsive heating systems.
This period should not be too short, otherwise the control system may hunt.
The algorithm prevents hunting by changing the flow setpoint more quickly (at
a rate of
±
2 K within a scanning period) when the deviation of the room
temperature is diminishing than when it is increasing (at a rate of
±
1 K within
a scanning period). If the deviation of the room temperature is less than
0.25 K, the flow setpoint is not altered. In most cases, the factory setting (20
minutes) provides satisfactory results for residential buildings.
Open windows or other cooling or heating loads may have an effect on
controllability. If these influences suddenly cease, the room temperature may
briefly be exceeded or undercut in the opposite direction.
Correction of room temperature
The measured value for the room temperature is adjusted with the help of this
parameter. The value that is entered is added to the measured value for the
room temperature.
Correction of outdoor temperature
The measured value for the outdoor temperature is adjusted with the help of
this parameter. The value that is entered is added to the measured value for
the outdoor temperature.
Proportional band
SERVice parameter 12 sets the proportional band (X
P
) of the PI control for
the flow temperature in K.
Integral action time
SERVice parameter 13 determines the integral action time (T
N
) of the PI
control for the flow temperature in seconds.
SP08
SP09
SP10
SP11
SP12
SP13