PRO-S Rev1104
16
Pressure Mode Operation
In the pressure mode of operation the
PRESSURE
LED will be on. The PRO-S
will maintain a constant discharge pressure. It will adjust the engine RPM automatically
to compensate for variations in pressure.
Note: When changing from RPM mode to pressure mode the pressure setting
will be the pressure that the pump was operating at in RPM mode.
1. Press and hold
PRESSURE
mode button for 3 seconds.
Result:
PRESSURE
LED goes on.
2. Press
PRESET
and/or
INCREASE/DECREASE
button to select the
operating discharge pressure.
3. Press
IDLE
button to bring engine to idle RPM.
Result:
SETTING
display shows
IdLE.
Switching Supply Water
When switching the water supply source from tank to hydrant, draft to hydrant, or
draft to relay, water flow through the pump can become turbulent and the positive
pressure from these sources may generate a sudden pressure surge. It is recommended
that the PRO-S be set in RPM mode before changing the water supply source.
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.
In pressure mode the PRO-S will increase the engine RPM and attempt to maintain
the selected pressure setting. If the discharge pressure drops below 45 PSI but stays
above 15 PSI the PRO-S 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 (30 for PRO-S 3) the
PRO-S will set the engine to idle RPM for seven seconds. The PRO-S will repeate the
low water cycle as long as the discharge pressure is between 15 and 45 PSI.
If the discharge pressure drops below 15 PSI the engine RPM will go to idle and
the SETTING display will show the selected setting. When the discharge pressure
rises above 45 PSI the PRO-S will resume control at the previous selected setting.
Opening/Closing Discharge Valves
In pressure mode the PRO-S will maintain the pressure setting regardless of the
number of discharge lines that are opened or closed providing there is a sufficient
water supply. As lines are opened the discharge pressure will start to drop and the
PRO-S will raise the engine RPM to maintain the required pressure. As lines are closed
the discharge pressure will start to rise and the PRO-S will lower the engine RPM to
maintain the required pressure.
