Phase Technologies Essential Series - Digital Constant Pressure Systems

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7.3 Digital Constant Pressure Systems
For digital CP systems, the factory default settings will be satisfactory for most CP
applications. When running in digital CP, the digital pressure switch only supplies the drive
with an open or closed signal, so the drive will not display pressure on screen.
Adjusting Parameters in Digital CP Systems
Using the keypad, there are several parameters which can be adjusted to fine tune digital
CP systems. These are MAX FREQUENCY, MIN FREQUENCY, TOFF, T1ON, T2ON,
SHUTOFF FREQUENCY, and BOOST AMOUNT. The use of these parameters has been
discussed in the previous section. Table 13 provides more detail.
Digital Constant Pressure Installation Procedures:
1. Install the digital pressure switch (included with the ES3R) in the water line
Control Tip: Turbulence near pressure switch or transducer can result in poor
pressure control. For best results, pressure switches and transducers should be placed at
least 6 inches away from pressure tanks, check valves, and pipe elbows.
2. Install spade terminals, on provided pressure switch wire, to the Normally Closed
(NC) and Common (COM) terminals of the digital pressure switch.
3. Install other end of pressure switch wires to AUX1 and COM ports on control
board. Cut sensor cable to length, if necessary.
4. Install rubber boot over pressure switch.
5. Attach cable shield to the Control Terminal Ground. See Figure 4 for location.
6. Adjust the pressure set point by following the steps in Section 7.2.
7. Navigate through the keypad Main Menu item CHANGE PARAMETER VALUES
> INTERFACE PARAMETERS > SYSTEM CONFIG. Select 1 to set the system
configuration for a digital CP system.
Digital Overpressure Switch Installation and Programming:
8. If using an emergency over-pressure limit switch, connect it between AUX2 and
COM (common). Then navigate to CHANGE PARAMETER VALUES >
INTERFACE PARAMETERS > AUX2 SELECT and set this parameter to 0
(closed = RUN, open = STOP). To set the emergency over-pressure limit switch,
follow the steps in Section 7.2.
CAUTION: The emergency over-pressure limit switch should be set at least 10 PSI
higher than the desired constant pressure set point.
9. Set the keypad to AUTO mode to operate the system.