AK-PC 781A Capacity controller RS8HE202 © Danfoss 2017-07 95
Variable integration time
There are two parameters, so Tn can be made variable. This allows
control to be more rapid, the further pressure deviates from the
reference.
The A+ setting will lower Tn when the pressure is above the refe-
rence, and the A- setting will lower Tn when the pressure is below
the reference.
Tn has been set to 120 s in the graph below, and falls to 60 s if the
pressure is above the reference and to 40 s if the pressure is below
the reference.
Above the reference: Set Tn divided by the A+ value.
Below the reference: Set Tn divided by the A- value.
The controller calculates the curve, such that regulation is smooth.
Easy-
Settings
Regulation parameters
Kp Tn A+ A-
1 = Slowest 1.0 200 3.5 5.0
2 1.3 185 3.5 4.8
3 = Slower 1.7 170 3.5 4.7
4 2.1 155 3.5 4.6
5 = Default 2.8 140 3.5 4.4
6 3.6 125 3.5 4.2
7 = Faster 4.6 110 3.5 4.1
8 5.9 95 3.5 4.0
9 7.7 80 3.5 3.8
10= Fastest 9.9 65 3.5 3.5
User defined 1.0 - 10.0 10 - 900 1.0 - 10.0 1.0-10.0
Regulation parameters
To make it easier to start up the system, we have grouped regula-
tion parameters into sets of commonly used values, called "Easy-
settings". Use these to choose between sets of settings appropri-
ate for a system which responds slowly or quickly. The factory
setting is 5.
If you need to fine tune the control, select the "User defined" set-
ting. All parameters can then be freely adjusted.
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