9
Operation
DPCT IOM InsTruCTIOn OPeraTIOn Manual
MN124018EN January 2023 www.eaton.com
running via a manual start, the engine needs to be manually
stopped via the stop pushbutton located on the enclosure
flange or by placing the controller in the OFF mode.
4.3.2 Automatic start sequence
Automatic start is defined as a low-pressure start condition,
deluge valve start condition or a remote auto start.
Whenever the engine is running via an automatic start, the
engine can automatically stop once all starting conditions
have returned to normal and the minimum run timer (MRT)
has finished its timing cycle. If automatic shutdown is
disabled, the engine needs to be manually stopped via the
local STOP pushbutton located on the enclosure flange or by
placing the controller in the OFF mode.
4.3.2.1 OFF mode
When the MANUAL/OFF/AUTO (MOA) selector switch is
placed in the OFF position the controller will not attempt to
start the engine for any reason. Off mode also resets and
silences all alarms.
4.3.2.2 MANUAL mode
When the MANUAL/OFF/AUTO (MOA) selector switch is
placed in the MANUAL position this allows the starting of
the engine using the manual crank buttons
(Crank #1)
and (Crank #2)
These are located on the enclosure flange. For
added cranking capacity, both 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 the engine is running. Doing so can result in serious
damage to the engine.
4.3.2.3 AUTO mode
A drop in system pressure, a valid remote input starting
condition, or a 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. If 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.
4.3.2.4 STOP modes
The Stop Mode is programmable for Automatic 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. It may also be stopped automatically in the event
of an OVERSPEED condition.
4.3.2.4.1 Manual stop mode
The engine will continue to run until the “Local Stop”
pushbutton is depressed - providing all starting causes have
been eliminated.
4.3.2.4.2 Automatic shutdown
The engine will continue to run until the MRT has timed out
and all starting causes have been eliminated.
4.3.2.4.3 Weekly test timer
Each DPCT 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.
To protect the engine, during the Weekly Test sequence,
an OVERSPEED condition, LOW OIL PRESSURE or HIGH
ENGINE TEMP alarm will automatically shut down the engine.
4.3.2.4.4 Test engine pushbutton
The Test Engine pushbutton is found on the HOME tab
screen of the user interface touch screen. It is located just
below the source voltage value.
Pressing the Test Engine pushbutton will require the user
to input the length of the test run time. Once accepted the
controller will initiate a starting sequence by momentarily
opening the drain valve creating a drop in the system
pressure. The controller will start the engine in the
automatic mode.
The TEST sequence can be terminated by putting the
controller in the OFF mode, pressing the STOP button, or
pressing the ABORT TEST button.
All alarms are active in the test mode. To protect the engine,
in the test mode, an OVERSPEED condition will automatically
shut down the engine. A LOW OIL PRESSURE or HIGH
ENGINE TEMP alarm will automatically shut down the engine
only if all the starting conditions are cleared.
4.3.3 Minimum run time (MRT)
The MRT is only active when AUTOMATIC SHUTDOWN
is enabled. The minimum run timer (MRT) performs the
automatic stopping function in the controller. After a start
initiated by the pressure sensor or by the “REMOTE
