Bronkhorst IQ+FLOW (from 01-07-2013) Manual do Utilizador descarregar pdf (Página 24)

Bronkhorst High-Tech B.V.

IQ+FLOW 9.17.04524

Controller Speed (Kspeed)

Type

Access

Range

FlowDDE

FLOW-BUS

Modbus

Float

0…3.4E+38

254

114/30

0xF2F0…0xF2F1/62193…62194

This parameter is the controller speed factor. PID-Kp is multiplied by this factor.

Ti (PID-Ti)

Type

Access

Range

FlowDDE

FLOW-BUS

Modbus

Float

0…1E+10

168

114/22

0xF2B0…0xF2B1/62129…62130

PID controller integration action in seconds. This value should not be changed.

Td (PID-Td)

Type

Access

Range

FlowDDE

FLOW-BUS

Modbus

Float

0…1E+10

169

114/23

0xF2B8…0xF2B9/62137…62138

PID controller differentiation action in seconds. The default value is 0.0. This value should not be changed.

Open from Zero control response (Kopen)

Type

Access

Range

FlowDDE

FLOW-BUS

Modbus

Unsigned char

0…255

165

114/18

0x0E52/3667

Controller response when starting-up from 0% (when valve opens). Value 128 is default and means: no correction.

Otherwise controller speed will be adjusted as follows:

New response = Old response·1.05

(128-Kspeed)

Normal Step response (Knormal)

Type

Access

Range

FlowDDE

FLOW-BUS

Modbus

Unsigned char

0…255

114/5

0x0E45/3654

Controller response during normal control (at setpoint step). Value 128 is default and means: no correction.

Otherwise controller speed will be adjusted as follows:

New response = Old response·1.05

(128-Knormal)

Stable Situation control response (Kstable)

Type

Access

Range

FlowDDE

FLOW-BUS

Modbus

Unsigned char

0…255

141

114/17

0x0E51/3666

Controller response when controller is stable (within band of 2% of setpoint). Value 128 is default and means: no correction.

Otherwise controller speed will be adjusted as follows:

New responce = Old responce·1.05

(128-Kstable)

4.1.5 Display filter

The output signal of an IQ

FLOW® instrument (measured value) is filtered. The filter has dynamic behaviour: when a change in

sensor signal is detected, the measured value will be less filtered than when the sensor signal is constant and stable. There are two

filter constants: Static Display Factor and Dynamic Display Factor. These two factors can be transformed into time constants using

the following formula:

The measured value is filtered with a first order low pass filter with a filter time constant between the two ô values.

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Bronkhorst IQ+FLOW (from 01-07-2013) Manual do Utilizador Página 24

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