Instruction Manual

FORM-ENG-0018 REV A 05-27-03
607 NW 27th Ave
Ocala, FL 34475
Ph: 352-629-5020 or 1-800-533-3569
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TECHNICAL DATA SHEET
PAGE
10 OF 26
DATE
3/28/2012
PRODUCT GROUP
THROTTLE CONTROL
P/N 117155 REV
1.23
PRODUCT
TOTAL PRESSURE GOVERNOR (TPG)
BY AMS
Manual P/N 117684
4.2.2. Pressure mode
Pressure mode (PSI) maintains a set pump pressure by monitoring the pressure transducer and modifying the
pump speed by adjusting the engine RPM. The operator can modify the set pump pressure with the TPG’s control
switches.
(Proper interlocking is required for normal operation – refer to Required Interlocking section 4.3)
Pressure mode (PSI) affords the most safety to the operator by not allowing potentially hazardous pressure
spikes. The TPG will maintain the set pump pressure even when discharge lines are actively opened and closed
as long as the water supply is sufficient. The TPG will automatically increase engine speed when pump pressure
has decreased due to discharge lines being opened. The increase in engine speed will return the pump pressure
to the desired set pressure (and vice-versa when discharge lines are closed).
Press the MODE switch to select pressure mode. The display
will momentarily show “GOV=PRESSURE” and the PSI mode
indicator LED will illuminate yellow.
It may be necessary to press the MODE switch twice depending
on the configured first mode (see section 5.2.5).
Press the INC switch to increase or the DEC switch to decrease
the pressure set point.
Press the PRESET switch to set the pump pressure to the
configured preset. The TPG will adjust the engine RPM to
maintain the preset pressure value (see section
4.4).
Configure the pressure mode preset through the Setup Menu
(see section 5.2.4).
Press the IDLE switch at any time to set the TPG back to
standby. The display will momentarily show “IDLE” and both
mode indicator LEDs will be off (see section 4.5).
There are five control properties which can be modified to improve pressure mode performance: pressure
sensitivity, PSI time-out, PSI increase step, pressure lag, and PSI gain.
CONTROL PROPERTY DESCRIPTION DEFAULT SECTION
Pressure sensitivity
Controls how much difference between the set pressure and
actual pressure that is allowed before the TPG actively
adjusts the engine RPM to bring the pump pressure back to
the set pressure.
6 PSI 5.2.9
Pressure time-out
When the pressure drops below 30 PSI for the number of
seconds configured the engine RPM will be reduced to idle,
the alarm will sound and the OPERATOR CMD warning will
be shown in the display window (see section 4.6).
3 SEC 5.2.14
Pressure Gain
The pressure change requested with each INC or DEC switch
press.
3 PSI 5.2.14
Pressure lag
While the increase button is held, controls how much
pressure change between the desired pressure and actual
pressure can occur before the engine RPM is adjusted to
maintain desired pressure.
5 PSI 5.2.29