Danfoss ECL Comfort 210 Operating Manual page 73

Operating Guide ECL Comfort 210 / 310, application A231 / A331
MENU > Settings > Control parameters
Xp (proportional band)
See Appendix "Parameter ID overview"
Set the proportional band. A higher value will result in a stable but
slow control of the flow temperature.
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.
VI.LG.P2.02
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How to calculate the running time of a motorized control valve
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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)
5.0 mm x 15 sec. / mm = 75 sec.
Example:
Rotating valves
Running time = Turning degrees x actuator speed (sec. / degr.)
Example: 90 degr. x 2 sec. / degr. = 180 sec.
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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.
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