System Set-Up
In general the Shadow System will maintain a water level that is one-half way between
the “low water” and the “high water” setting that you calibrated it for. The Shadow
set-up is the procedure to train the Shadow where low and high water levels are.
You choose these two levels at the job site (choose levels such that the white part
of the probe is in contact with the water).
Shadow Set-Up for Capacitance Signal Generator
- Fill the vessel to your “low water” level.
- Apply 110-volt power to the Shadow actuator.
- Check to see that the Capacitance Signal damping screw is fully clockwise (see fig.
#2).
- Push and hold the zero and span the “Down” buttons in together for five (5) seconds.
- Push and hold the zero and span the “Up” buttons in together for five (5) Seconds.
(This clears the existing settings)
- In block 2 (1-8) (fig, 1), attach your black voltage lead to #4 and your red voltage
lead to #5. #5 must also have the wire connected to it from (-) on signal generator.
Set your voltage meter to D.C. voltage. (Don’t worry what the valve is doing while
the set-up is being done).
- (DC volt setting –Value should be positive)
- Press and hold the zero “Up” button until you read + 1.5Vdc.
- Press and hold the zero “Down” button until you read + 1.0Vdc. (Be patient the values
don’t change right away)
- Fill the vessel to “high water” level.
- Adjust the span “Up” until the meter reads + 5.0 DC Volts.
- This finishes the Capacitance Signal Generator set-up. Leave the Capacitance damping
screw fully turned clockwise. Remove meter.
To Check the "Dead"Band" or "Sensitivity" of the System
- Have a constant volume of water in the vessel somewhere in the low to high range.
- Remove a jumper A (see fig. #1)
- Watch the red and green leds for one (1) minute. The lights should end up with both
off. If they are going on one after another then dead band is to narrow. (see Fig.
#1) Adjust the dead band clockwise until both lights stay off.
- Reinstall jumper A
Figure 1
Conclusion
This concludes the field set-up. The system is now ready for normal duty. Start
up the process (boilers, etc.). In a normal operation this is what to look for:
- With the actuator cover removed, the red and green LED set-up lights go on and off, but do not stay on.
- The actuator motor is NOT HOT to the touch.
- The water level is stable.
- The water level is in the sight glass in the range you set it for.
- The pump discharge pressure is constant.
Figure 2
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