Function of VS 300
52
Doku-Version 2.05 - Firmware 2.10 - 15. September 2017
Neutral zone (NZ)
t
c
t
c Setp
- 1,0 NZ
t
c Setp
- 1/2 NZ
t
c Setp
+ 1/2 NZ
I action
increase
I action
hold
I action
decrease
I action
hold
t
c Setp
t
c Setp
+ 1,0 NZ
High pressure (HP)
Time
Control algorithm HP combined controller
- part-load operation -
Neutral zone (NZ)
t
c
t
c Setp
- 1,0 NZ
t
c Setp
- 1/2 NZ
t
c Setp
+ 1/2 NZ
I action
increase
I action
hold
I action
decrease
I action
hold
t
c Setp
t
c Setp
+ 1,0 NZ
High pressure (HP)
Time
- load operation -
ZNR. 51203
62 030 E1
The controller output for the speed adjuster is calculated from the P and I action:
Controller output = P action + I action
If all fans are stopped and the actual value is greater than the setpoint (positive control error), the first fan (F1:
enable frequency changer) is started immediately.
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