Danfoss AK-PC 781A User Manual page 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.
AK-PC 781A Capacity controller RS8HE202 © Danfoss 2017-07
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.
Easy-
Settings
Kp
1 = Slowest 1.0
2 1.3
3 = Slower 1.7
4 2.1
5 = Default 2.8
6 3.6
7 = Faster 4.6
8 5.9
9 7.7
10= Fastest 9.9
User defined 1.0 - 10.0
Regulation parameters
Tn A+ A-
200 3.5 5.0
185 3.5 4.8
170 3.5 4.7
155 3.5 4.6
140 3.5 4.4
125 3.5 4.2
110 3.5 4.1
95 3.5 4.0
80 3.5 3.8
65 3.5 3.5
10 - 900 1.0 - 10.0 1.0-10.0
95