Danfoss C67 Guide de l'utilisateur télécharger pdf (Page 36)

The grey

side of the

ECL Card

Basic set-up

4 Proportional band, Xp

Circuit Setting range Factory setting

I / (II) 1 ... 250 K 80 / (80) K

Set the proportional band.

A higher value will result in a stable but slow

control of the ﬂow temperature.

5 Integration time constant, Tn

Circuit Setting range Factory setting

I / (II) 5 ... 999 sec. 30 / (30) sec.

Set a high integration time constant to obtain a

slow but stable reaction to deviations.

A small integration constant will make the

controller react fast but with less stability

6 Running time of the motorized control valve

Circuit Setting range Factory setting

I / (II) 5 ... 250 sec. 35 / (35) sec.

Set the running time of the motorized control valve

according to the example. This is the time it takes

the controlled unit to move from fully closed to

fully open position.

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 degrees x 2 = 180 sec.

Control parameters -

lines 4-7

26a

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 83 84

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Danfoss C67 Guide de l'utilisateur Page 36