Version 2.02 15.05.2007
Function of VS 3000
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3.27.8.2 Control algorithm for staged combined controller
High pressure detected by an A/D converter is compared with the setpoint. The following relationship applies:
Controlerror = Actualvalue (t
c_Act
) − Setpoint (t
c_Setp
)
Using a PI control algorithm, a speed setpoint is calculated as a function of the control error and supplied to the
speed adjuster via an analog output (0 - 10 V), see Section 1.27.8. HP control takes place with one fan con-
trolled by a speed adjuster. Additional fixed-speed stages can be loaded or unloaded separately.
Depending on the VS 3000 expansion stage the number of fan stages that can be controlled is as follows:
- VS 3000 basic configuration: 3 fan stages
- One SIOX extension module added: 7 fan stages
- Two SIOX extension modules added: 11 fan stages
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