Danfoss ECL Comfort 100M Guía de usuario descargar pdf (Pagina 27)

The grey

side of the

ECL Card

Basic set-up

26b

7 Neutral zone, Nz

Circuit Setting range Factory setting

I 0 ... 9 K 3 K

Set the neutral zone to a high value if you can

accept a high variation in ow temperature.

When the actual ow temperature is within the

neutral zone, the controller does not activate the

motorized valve.

The neutral zone is symmetrical around the desired ow

temperature value, i.e. half the value is above and half the value is

below this temperature.

Control parameters (lines 4-7) are overruled if thermo actuator is

chosen (OFF).

If you want to tune the PI regulation precisely, you can

use the following method:

• Set the integration time (line 5) to its max. value

(999 sec.).

• Decrease the value for the proportional band (line 4) until the

system starts hunting with a constant amplitude (it might be

necessary to force the system by setting an extreme value).

• Find the critical time period on the temperature recording or

use a stop watch.

Temp.

Critical time period

Time

This time period will be characteristic for the system, and you can

evaluate the settings from this critical period.

Integration time = 0.85 x critical time period

Proportional band = 2.2 x proportional band value in the

critical time period.

If the regulation seems to be too slow, you can decrease the

proportional band value by 10%.

Make sure there is a consumption when you set the parameters.

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Danfoss ECL Comfort 100M Guía de usuario Pagina 27