Function of VS 300
47
Doku-Version 2.05 - Firmware 2.10 - 15. September 2017
4.5.1 Setting HP transducer characteristic
The VS 300 Pack Controller works with continuous pressure transducers of linear characteristic. At the present
time, exclusively pressure transducers with current output (4-20 mA) are usable.
Current hardware design of analog inputs on the pressure transducers for Control Loops 1 and 2 is
as current inputs (4-20 mA)!
Care is required when installing the pressure transducers. The leads must be shielded and must not
run parallel with power cables. Suitable precautions must be taken to prevent interference entering
the transducer leads.
The following parameters are used to match the controller to the pressure transducers:
Integral operation
VS 300 LED display
Display
AL 300 or CI 3000
Description
See Section 7 Parameter List
and Menu Structure/ Parame
ter List S3 - Pressure transdu
cer parameter setting
CL1/CL2 for 4 mA
pc 4 mA Parameter defines pressure p
c
at whicht the transducer delivers the
4 mA output signal.
See Section 7 Parameter List
and Menu Structure/ Parame
ter List S3 - Pressure transdu
cer parameter setting
CL1/CL2 for 20 mA
pc 20 mA Parameter defines pressure p
c
at whicht the transducer delivers the
20 mA output signal.
A message is displayed when one of these parameters is changed:
Integral operation
VS 300 LED display
Display
AL 300 or CI 3000
Description
E203 Sens.type change Parameter for pressure transducer has been changed.
Faulty setting of parameters can cause serious impairment of function.
4.5.2 High-pressure control neutral zone
When high-pressure control is performed by step controller, no fan actuation takes place until the control error
remains within a definable neutral zone. With combined control the effect of the neutral zone is as follows.
As long as the control error remains within 1.5 times the neutral zone, high pressure is controlled by increasing
or decreasing fan speed. Above or below 1.5 times the neutral zone, the fan runs at maximum or minimum
speed to achieve fast control action.
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