Danfoss ECL Comfort 210 Operating Manual page 96

Operating Guide ECL Comfort 210/296/310, application A232 / A332
MENU > Settings > Control parameters
Xp actual
'Xp actual' is the read-out of the actual Xp (proportional band) based on
the supply temperature. Xp is determined by settings related to the supply
temperature. Typically, the higher the supply temperature, the higher the Xp
must be in order to achieve a stable temperature control.
Xp setting range:
Fixed supply temperature settings: 65 °C and 90 °C
Factory settings:
This means that the 'Xp' is 40 K at 65 °C supply temperature, and
'Xp' is 120 K at 90 °C.
Set the desired Xp values at the two fixed supply temperatures.
If the supply temperature is not measured (the supply temperature
sensor is not connected), the Xp value at the setting 65 °C is used.
MENU > Settings > Control parameters
Tn (integration time constant)
See Appendix "Parameter ID overview"
Set a high integration time constant (in seconds) to obtain a slow
but stable reaction to deviations.
A low integration time constant will make the controller react fast
but with less stability.
MENU > Settings > Control parameters
M run (running time of the motorized control valve)
'M run' is the time in seconds it takes the controlled component to move
from fully closed to fully open position.
See Appendix "Parameter ID overview"
Set the 'M run' according to the examples or measure the running
time by means of a stop watch.
MENU > Settings > Control parameters
Nz (neutral zone)
When the actual flow / duct temperature is within the neutral zone, the
controller does not activate the motorized control valve.
See Appendix "Parameter ID overview"
Set the acceptable flow /duct temperature deviation.
Set the neutral zone to a high value if you can accept a high
variation in flow temperature.
96 | © Danfoss | 2017.08
5 ... 250 K
(65,40) and (90,120)
1x185
1x186
1x187
How to calculate the running time of a motorized control valve
The running time of the motorized control valve is calculated using
the following methods:
Seated valves
Running time = Valve stroke (mm) x actuator speed (sec. / mm)
Example: 5.0 mm x 15 sec. / mm = 75 sec.
Rotating valves
Running time = Turning degrees x actuator speed (sec. / degr.)
Example: 90 degr. x 2 sec. / degr. = 180 sec.
The neutral zone is symmetrical around the desired flow / duct
temperature value, i.e. half the value is above and half the value is
below this temperature.
VI.JM.G2.02