PRO-S Rev1104
15
OPERATION
On power up the PRO-S will be in the pressure mode of operation. The SETTING
display will show IdLE. If there is a problem, the SETTING display will show an
error code. Refer to the Diagnostics section for error code descriptions.
The minimum pump discharge pressure must be greater than 15 PSI for
the PRO-S governor to take control of engine speed.
No variation in discharge pressure or RPM will occur when changing between
pressure and RPM modes.
INCREASE/DECREASE Buttons
The INCREASE and DECREASE buttons are used to change pressure and
RPM settings or program preset values. The rate and amount the numbers change
when a button is pressed depends on the mode and how long the button is held.
In Pressure Mode. Press either button momentarily to change the pressure setting
by 1 PSI. Press and hold the button for more than 2 seconds and the pressure
setting will change by 5 PSI twice and then by 10 PSI until the button is released.
In RPM Mode. Press either button momentarily to change the RPM setting by
10 RPM. Press and hold the button for more than 2 seconds and the RPM
setting will change by 50 RPM twice and then by 100 RPM until the button is
released.
Switching Between Operating Modes
• No variation in discharge pressure or RPM will occur when changing between
pressure and RPM modes.
• When changing to RPM mode, the RPM setting will be the RPM that the
pump was operating at in pressure mode.
• When changing to pressure mode the pressure setting will be the pressure that
the pump was operating at in RPM mode.
When the PRO-S SETTING display shows IdLE:
Press the mode button and the PRO-S switches modes immediately.
When the PRO-S SETTING display shows a value (operating at some setting):
Press and
hold the mode button for 3 seconds and the PRO-S changes modes.
(This is to avoid an accidental change over if the buttons get bumped.)
High Pump Discharge Pressure at Engine Idle
Once the governor has set the engine to idle, it can do no more to reduce discharge
pressures. To reduce discharge pressure the pump operator can gate incoming water,
reduce pressure at the intake relief valve, gate discharges, or disable the pump.
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