Diesel Engine Fire Pump Controller
8
EATON CORPORATION
www.eaton.com
4.2 Start Sequence
In the Automatic Mode the Diesel Plus controller will
automatically start and stop the fire pump motor as dictated by
the features supplied and their programmed set-point values. A
summary of the controller intelligence and supervisory circuits
that constantly monitor the condition of the system pressure,
inputs, and system alarm points is provided.
4.2.1 Manual Start Sequence
Manual start is defined as a remote start. Whenever the engine
is running via a manual start, the motor needs to be manually
stopped via the stop pushbutton located on the enclosure
flange or by placing the controller in off mode.
4.2.2 Automatic Start Sequence
Automatic start is defined as a low-pressure pump start contact
closure, and Deluge Valve start condition. (Terminals 11 and 36)
Whenever the engine is running via an automatic start the
engine can be automatically stopped. In order for the controller
to automatically stop the engine automatic stopping must be
enabled, the RPT must be finished its timing cycle and no
starting conditions can exist. If the controller is programmed
for automatic shutdown, the motor needs to be manually
stopped via the local stop pushbutton located on the enclosure
flange or by placing the controller in the off mode.
OFF Mode
In the OFF position the controller will not attempt to start the
engine for any reason. Off mode also resets and silences all
alarms.
MANUAL Mode
This position allows the starting of the engines using the
manual crank buttons, Crank #1 and Crank #2, are located on
the enclosure flange. For added cranking capacity, both Crank
buttons can be depressed simultaneously.
The engine can be stopped by the “Local Stop” pushbutton or
by placing the controller in the OFF mode. The engine will
automatically stop in the case of an OVERSPEED condition.
All alarms, except for “FAIL TO START”, are active in the
MANUAL mode.
CAUTION
Only depress Crank #1 or Crank #2 pushbuttons with controller in the
“MANUAL” mode.
Do not depress the crank pushbuttons in any other mode or while engine is
running. Doing so can result in serious damage to the engine.
AUTO Mode
A drop in pressure, “Remote Start” signal, “Pump Start” signal,
a signal from the “Deluge Valve” or Weekly Test Timer will
initiate the “attempt to start” cycle. This cycle consists of 6
crank periods of 15 seconds duration separated by 5 rest
periods of 15 seconds duration. Battery 1 and Battery 2 are
alternated for each crank cycle. In the event that one battery is
inoperative or missing, the controller will lock-in on the
remaining battery during the cranking sequence. Once the
engine is running, the controller will stop all further cranking.
STOP Modes
The Stop Mode is programmable for Auto Shutdown - On or Off
(see Appendix C). Note that the engine can be stopped in many
cases by pressing the local stop push button or at any time by
placing the controller in the OFF position or automatically in
case of an OVERSPEED condition.
Manual Stop Mode:
The engine will continue to run until the
“Local Stop” pushbutton is depressed - providing all starting
causes have been eliminated.
Auto Shutdown:
The engine will continue to run until the
running period timer (RPT) has timed out and all starting
causes have been eliminated.
Weekly Test Timer
Each Diesel Plus controller is equipped with a Weekly Test
Timer, to automatically exercise the engine in one week
intervals, based on the programmed setting. The controller
initiates the starting sequence by opening a drain valve
resulting in a simulated system pressure loss. The drain valve
is automatically closed once the controller receives a Low
Pressure signal. The engine will continue to run for the
programmed duration. “Weekly Test Started” will be saved into
the controller memory.
In order to protect the engine, during the Weekly Test sequence,
an OVERSPEED condition, LOW OIL PRESSURE or HIGH
ENGINE TEMP alarm will automatically shutdown the engine.
Engine Test Pushbutton
Pressing the Engine Test pushbutton initiates a starting
sequence by opening the drain valve resulting in a pressure
loss. The controller will start the engine in the automatic mode.
The TEST sequence can be terminated by putting the controller
in the OFF mode, otherwise the STOP mode prevails as
programmed.
All alarms are active in the test mode. In order to protect the
engine, in the test mode, an OVERSPEED condition, LOW OIL
PRESSURE or HIGH ENGINE TEMP alarm will automatically
shutdown the engine.
4.2.3 Run Period Timer
The RPT is only active when active when the auto stop is set
to "On". The Run Period Timer (RPT) performs the automatic
stopping function in the controller. After a start initiated by the
pressure sensor or via the “Pump Start” input the controller will
start and run for the duration of the RPT.
The purpose of the RPT is to ensure that the engine is not
subjected to frequent starts in response to the pressure. Refer
to Appendix D for programming of the RPT.
4.2.4 Sequential Start Timer
The Sequential Start Timer is standard in all Diesel Plus fire
pump controllers.
The controller for each unit of multiple pump units shall
incorporate a sequential timing device to prevent any one
driver from starting simultaneously with any other driver.
Each pump supplying suction pressure to another pump shall
be arranged to start within 10 seconds before the pump it
supplies. The controllers for pumps arranged in series shall
be interlocked to ensure the correct pump starting sequence.
