Class1 3041-10X-00-CL1 - Sentry Governor - EXTERNAL - Manual (Page 14)

FORM-ENG-0018 REV A 05-27-03
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TECHNICAL DATA SHEET
PAGE
13 OF 36
DATE 6/19/2014
PRODUCT GROUP THROTTLE CONTROL P/N 3045-101-00-CL1, 3045-102-00-CL1 REV 1.02
PRODUCT SENTRY PRESSURE GOVERNOR BY AMS
4.3. Required interlocking
The SENTRY requires interlocks before engine control operations are permitted. The SENTRY provides two
interlock inputs that allow easy separation of pumping operations and throttle/high idle operations through two inputs
dedicated as system interlocks: THROTTLE READY (pin 2 of connector C) and PUMP ENGAGED (pin 4 of connector
D). These interlock inputs are activated when system power is applied (positive polarity).
The OEM is responsible for creating safe and effective interlocking routines.
The SENTRY uses green icons to indicate the status of the interlocks.
THROTTLE READY interlock PUMP ENGAGED interlock OKAY TO PUMP
Apply system power to pin 2 of
connector C (through OEM
interlocking).
THROTTLE READY icon illuminates
green. Apply system power to pin 4 of
connector D (through OEM
interlocking).
PUMP ENGAGED icon illuminates
green. When THROTTLE READY and
PUMP ENGAGED interlocks are
applied the OKAY TO PUMP icon
illuminates green.
The SENTRY will operate in throttle
mode (RPM) only. The SENTRY will not operate in any
mode until the THROTTLE READY
interlock is also applied. The SENTRY will operate in throttle
mode (RPM) or pressure mode
(PSI).
4.4. PRESET button operation
The PRESET buttons bring the discharge pressure (or engine RPM, in throttle mode) to the configured
preset point (see section 6.4.2 to 6.4.5).
Using a PRESET button is a method of smoothly and expeditiously attaining water pressure and flow, but it is not
intended to be the initial attack pressure. Attack pressures and flows should be determined by the actual fire status
and manually achieved for best operation.
PRESET is an operational convenience and needs to be considered as a fixed point (higher or lower than the current
point) that can be achieved with a single button press.
Note: Initiating pumping operations is simplified by bringing the pump to a preset pressure with a single button press.
Consequently, securing or regaining control operations can be aided by returning to this fixed pressure point with a
single button press.
4.5. IDLE button operation
Press and hold the IDLE button (on Sentry or Twister) for one second to release engine
RPM control back to the engine ECU. The engine RPM will promptly go to its configured
curb idle (see section 6.6.5).
Note: In view of the fact that driveline stress can be induced by quick changes in engine speed, depending on rpm
and torque load, the engine speed is ramped to idle over a short duration to minimize the effect of driveline kick.