ECKELMANN VS 300 - Page 37

Function of VS 300
29
Doku-Version 2.05 - Firmware 2.10 - 15. September 2017
Neutralzone (NZ)
t
0
t
0 Setp
- 1,0 NZ
t
0 Setp
- 1/2NZ
t
0 Setp
+1/2NZ
I action
increase
I action
hold
I action
decrease
I action
hold
t
0 Setp
t
0 Setp
+ 1,0 NZ
Suction pressure
Time
Control algorithm LP combined controller
- part-load operation -
Neutralzone (NZ)
t
0
t
0 Setp
- 1,0 NZ
t
0 Setp
- 1/2NZ
t
0 Setp
+1/2NZ
I action
increase
I action
hold
I action
decrease
I action
hold
t
0 Setp
t
0 Setp
+ 1,0 NZ
Suction pressure
Time
-load operation -
ZNR. 51203
64 130 E1
The controller output for the speed adjuster is calculated from the P and I action:
Controlleroutpu
When all compressor stages are off and the actual value is greater than the setpoint (positive control error), the
first compressor stage (C1: enable frequency changer) is loaded immediately. Speed control is however not ac
tivated until a set delay has passed (Time = Basic time plus variable time, see also Compressor Actuating
Times). During the time delay, the compressor runs at a definable minimum speed.