Spirax Sarco LC2250, Инструкция по установке и обслуживанию

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IM-P402-130 EMM Issue 9 28
dri ve type – rel ay for Valve Motor Drive or rEt ransmit for 4 - 20 mA.
rel or rEt (only available when proportional control is selected).
Drive ACt ion – Inverts the output to the actuator, positioner or pump.
Select In for fill control, e.g. boiler feedtank.
Select Out for empty control, e.g. condensate tank. In proportional mode,
whether VMD or 4 - 20 mA, a rising input will give:
If In selected – a falling output.
If Out selected – a rising output.
L
evel
Hi
gh - Calibrates the unit to 100% of the gauge glass. Set the water level
in the boiler or tank to the top of the gauge glass and press the
OK
button. See
Figure 11. (On entering the sub-menu the level transducer voltage / current is
displayed). To exit without saving the calibration level, press the button.
L
evel
Lo
w - Calibrates the unit to 0% of the gauge glass. Set the water level
in the boiler or tank to the bottom of the gauge glass and press the
OK
button.
See Figure 11. (On entering the sub-menu the level transducer voltage / current
is displayed). To exit without saving the calibration level, press the button.
S et P oint – the point from which the control band is generated. It is commonly
(though not always) set halfway between the minimum and maximum gauge
glass levels.
C
ontrol
b
and - Sets the width of the control band as a percentage of the gauge
glass. This is the percentage of the gauge glass over which you wish to control
the level – e.g. 20%, as shown in Figure 11.
C on t ro L – PrO or on / oFF ( OI ) ~ On / off or proportional control.
P otentiometer Hi gh – Calibrates the valve to the open position.
Press
OK
to select the sub-menu. The valve will automatically open.
When fully open press
OK
again to enter the value*.
P
otentiometer
Lo
w – Calibrates the valve to the closed position.
Press
OK
to select the sub-menu. The valve will close automatically.
When fully closed, press
OK
again to enter the value*.
End – Press the
OK
button to end the commissioning menu.
* Note: Only available when proportional control is selected. The valve has a feedback
potentiometer that allows the controller to sense the valve position.
PhI and PLO enables calibration of the feedback potentiometer’s MIN and MAX position to
match the valve.