Version 2.02 15.05.2007
Function of VS 3000
31
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3.27.7 Control algorithm with continuous control
High pressure detected by an A/D converter is compared with the setpoint. The following relationship applies:
Control error = Actual value (t
0_Act
) − setpoint (t
0_Setp
)
With a positive control error a speed setpoint is calculated by a PI control algorithm and is supplied to the speed ad-
juster via an analog output (0 to 10 V). The speed adjuster controls fan speed to the specified setpoint.
With a negative control error the speed adjuster is disabled by the first fan output L1 of the VS 3000 Pack Controller
when speed has dropped to zero. If minimum speed of the speed adjuster has been entered at larger than zero by the
Min. Speed parameter (Menu 3-3-1), speed is ramped down to zero after a definable time (Basic Time OFF Fan 1)
and fan output L1 is deactivated.
VS 3000 Inactivate speed adjuster enabling (at min. speed >0)
0
1
State
Fan Relay 1
Min.
Fan speed
AnalogOut
Fan [%]
Condition t < t
must be true
c Act c Setpoint
Ramp with
constant gradient
t
c
t [s]
t
c Setpoint
t [s]
t [s]
ZNR. 51203 65 430 E0
Basetime
OFF
Fan 1
Control is influenced by three parameters. The following parameters can be defined (Menu 3-3-1) with the
AL 300 Operator Terminal or CI 3000 Store Computer.
3 Setpoints - 3 HP-Control - 1 Control type
1 Control type →
2 Min. speed XX%
3 Adjust diff. XX
4 tc-max XX °C
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