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1.4.1 ANALOG SETPOINT 1 value is multiplied by the 1.7.4 ProPORTIONAL GAIN. This signal is then used
to determine the motor frequency. If the pressure transducer signal and the internal set-point value were the
same, then the motor speed would be zero. High 1.7.4 ProPORTIONAL GAIN and 1.7.3 IntEGRAL GAIN
values give smaller error in the pressure, but also make the system more susceptible to oscillation.
Additional adjustable parameters found in the Constant Pressure menu help to optimize the performance of
the system. The use of these parameters was discussed in the previous section. The unit is shipped with
default settings which will work in many applications with no adjustment. As with all systems of this type there
are tradeoffs between maintaining a tightly controlled set-point, achieving high motor efficiency, and
maintaining system stability.
Figure 21 – Analog Constant Pressure One-Line Diagram
CAUTION: Operating the system in MAN mode on the
keypad overrides signals from the pressures switches.
Operating the system in this mode may lead to dangerous
pressures in closed plumbing systems
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