12
Operation
DPCT IOM InsTruCTIOn OPeraTIOn Manual
MN124018EN January 2023 www.eaton.com
4.3.5.1.22 Undefined
Changing of the input state of this undefined input will be
shown in the diagnostic screen.
4.3.5.3 Loss of DC power
A visual indication and audible alarm are provided to
indicate DC Power Failure due to both batteries being
disconnected from the controller. This indication will also
be provided if the controller is not operating due to an
electronic board failure.
4.3.5.4 Speed switch malfunction
A visual indication and audible alarm are provided to indicate
when the following condition has occurred: The controller
is running, the engine run signal has been lost and the oil
pressure has not dropped. (Terminals 2 and 4)
4.3.5.5 Engine starter coil failure
The DPCT controller constantly monitors the health of the
engine starter solenoids. A visual indication and audible
alarm are provided if the DPCT detects that the engine
starter solenoid is disconnected or damaged.
4.3.5.6 Audible alarm silencing
A “Silence All Alarms” button is provided which can
manually silence the audible alarm for optional alarms. The
button is located on the user interface touch screen in the
bottom, right of the Notifications panel.
4.4 Output relays
The primary control outputs of the DPCT controller are dry
relay contacts. These relays are comprised of two separate
“Form C” outputs for: Engine Run, Low Fuel, Auto Mode,
and Common Alarm.
The Engine Run relay is UL/CSA rated at 10A, ½Hp, 240Vac.
The remaining alarm relays are UL/CSA rated at 8A, 250Vac.
The DC rating is 8A, 30Vdc
Each relay has a green LED adjacent to it on the I/O board
to indicate the relay status.
If the LED is illuminated the relay is energized, If the LED is
not illuminated then the relay is de-energized.
4.4.1 Engine run (1CR)
The Engine Run (1CR) relay is used for remote monitoring
when the engine is running. When the engine speed switch
sends a signal to the DPCT controller this relay will energize.
4.4.2 Low fuel (2CR)
The Low Fuel (2CR) relay is used for remote monitoring of
the fuel tank level. When the level switch in the fuel tank
falls below its pre-set level this relay will energize.
4.4.3 Auto mode (3CR)
The Auto Mode (3CR) relay is used to indicate that the
controller’s Manual/OFF/Auto selector switch is in the
Automatic mode.
4.4.4 Common alarm (4CR)
The Common Alarm (4CR) relay is used to signal pump
room or engine trouble alarms. This relay is energized
under normal conditions and will de-energize during an
alarm condition.
4.5 Engine Alarm Functions
4.5.1 Engine overspeed
An “Engine Overspeed” alarm will shut down the engine
regardless of the start condition in any mode that the
controller is set to. The signal is sent from the engine to
the controller.
4.5.2 Fail to start
After 6 cranking attempts, three attempts per battery, the
“Fail To Start” indicator will appear in the notifications
area of the user interface touch screen. There will be
an audible alarm to company this condition. Attention
to the diesel engine and its associated equipment is
required immediately.
4.5.3 High engine temperature
This alarm indicates that the coolant temperature in the
water jackets is extremely hot. The over temperature switch
on the diesel engine signals this to the controller. The
engine continues to run in the AUTO and MANUAL modes.
During a manual engine test and during the weekly test
cycle the engine will shut down in the event of this alarm.
4.5.4 Low oil pressure
The controller has a built-in delay which bypasses the low
oil pressure alarm during engine start up. After the delay
has expired, should the engine receive a “Low Oil Pressure”
signal, the controller will initiate an alarm. The engine will
continue to run in the “AUTO” and “MANUAL” mode. During
a manual engine test and during the weekly test cycle this
alarm will automatically shut down the diesel engine.
