Siemens SITRANS FC330, Руководство по эксплуатации, Страница: 152 / 280

)&
①
Open secondary valve
②
Open primary valve
③
Close primary valve
④
Close secondary valve
Example 4: Open secondary valve at 0 %; close primary valve after closing secondary valve
configured in recipe 1
Parameter configuration:
Menu 2.5 Dosing
- 2.5.1 Dosing Mode = Two on/off valves
Menu 2.5.5.6 Valve Control
- 2.5.5.6.1 Stage Setup Format = Relative
- 2.5.5.6.2 Stage 1 Primary Open = 33 %
- 2.5.5.6.3 Stage 1 Primary Close = 100 %
- 2.5.5.6.4 Stage 2 Secondary Open = 0 %
- 2.5.5.6.5 Stage 2 Secondary Close = 66 %
)&
①
Open secondary valve
②
Open primary valve
③
Close secondary valve
④
Close primary valve
● Control valve:
Dosing controlled by an analog valve configured in three stages as fully open (high flow),
partially open, and fully closed. During the open stage the valve may be not fully open but
controlled to a high flow condition.
Valve control parameter config‐
ured in each recipe
Default value Description
Fully Closed Current Level 0 mA The output current which defines the closed valve state
Partial Open Current Level 10 mA The output current which defines the partially open valve state
Fully Open Current Level 20 mA The output current which defines the high flow valve state
Fully Open 0.00 % of
Amount
The quantity or percent of amount at which the valve will transition from
partial to full flow
Partially Closed 100.00 % of
Amount
The quantity or percent of amount at which the valve will transition from
full flow to partial flow
Parameter assignment
8.2 Functions
SITRANS FC330
152
Operating Instructions, 01/2019, A5E44030648-AB