PBA100 Rev0407
17
Running Away From Water, No or Low Supply Water
There are situations during pump operations when there may be no or low supply
water. This can be due to an empty water tank, a problem on the intake line, or when
switching the water supply source.
The PumpBoss constantly monitors the discharge pressure and compares it to the
engine RPM
If discharge pressure drops very quickly (from air coming into the pump) the
PumpBoss will limit the RPM increase to +300 and not allow the engine to exceed
1900 RPM. If the discharge pressure does not increase after 3 seconds the PumpBoss
will reduce the engine speed by 150 RPM and this RPM will be held as long as the
pressure stays above 45 PSI. (See below for pressure drop below 45 PSI.) If at any time
a sufficient water flow is reestablished, the PumpBoss will resume normal operation.
If the discharge pressure starts dropping in pressure mode the PumpBoss will
increase the engine RPM and attempt to maintain the selected pressure setting. If an
increase in RPM does not bring the pressure up, the PumpBoss will recognize this as a
running away from water condition and hold the engine at a steady RPM. (The engine
will not go to the maximum RPM, it will hold at the RPM it recognized the running
away from water condition.) When the discharge pressure comes back up the engine
RPM will be adjusted to maintain the selected pressuire setting.
If the discharge pressure drops below 45 PSI but stays above 15 PSI the
PumpBoss will go into a low water cycle. It will set the engine to 1100 RPM, if the
pressure does not rise above 45 PSI in 7 seconds the PumpBoss will set the engine
at idle RPM. The PumpBoss will repeat the low water cycle as long as the discharge
pressure is between 15 and 45 PSI. When the pressure rises above 45 PSI the PumpBoss
will resume normal operation.
If the discharge pressure drops below 15 PSI the engine will be set at idle RPM.
When the discharge pressure rises above 15 PSI the PumpBoss will resume the low
water cycle.
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