DE-3000 IOI 7-17
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STATE 1: BEGIN AUTO START SEQUENCE TIMED DELAY PERIOD
When the auto start command is received, the first action taken is to create
an internal system reset which clears the previously set fault flags and resets
the PRE-LUBE (Timer 1) and DELAY BEFORE CRANKING (Timer 2) timers to
a count of zero. This is system STATE 1. The PRE-LUBE and DELAY BEFORE
CRANKING timers will both begin counting at this time, but they each have an
independently set value so that the PRE-LUBE pump can be set to run prior to
the cranking only or thru the cranking cycle or until some point in time after the
engine starts. If an optional pressure setpoint is going to be used to terminate
the PRE-LUBE operation, this can be done by using a secondary control setpoint
on oil pressure assigned to one of the discrete control outputs. In system STATE
1, while these timers are running, all class A setpoints are being monitored and
if any of these monitored points fault, the auto start sequence will be terminated
and the cause of the fault displayed, returning the unit to system STATE 0 on the
sequence chart. If no faults are present during system STATE 1, the DELAY BE-
FORE CRANKING timer continues to count until the selected value is reached.
In system STATE 1 of the sequence the system turns on the power supply OUT-
PUT #4, the PRE-LUBE output. This allows for the activation of an electrically
controlled pre-lube pump for a programmed time period of 0 to 999 seconds
prior to and/or during cranking. The use of an appropriate warning device which
can be used to alert any personnel near the engine of the forthcoming start
attempt is strongly recommended. This warning device (flashing lights or horn)
can be activated by the PRE-LUBE output directly or thru the use of auxiliary
relay contacts.
STATE 2: BEGIN CRANKING
When cranking begins the system is at STATE 2 on the sequence chart. After a
user programmed time delay, adjustable from 0 to 999 seconds and set when
programming the unit; the engine cranking will begin. At the point of cranking,
the Class B and Class C timers begin counting their programmed lock out delay
before arming values. The reason that these counters are not started until this
point in system STATE 2 is to maintain a constant lockout time from engine start
before arming regardless of the time required for cranking. This allows the Class
B and Class C setpoints to behave in the same manner and use the same timer
values for both AUTO START and MANUAL starting sequences. The CRANKING
motor is controlled via power supply OUTPUT #3, which would typically be used
to control a solenoid valve or power relay connected to the starting device.
STATE 3: PURGE 1 NO FUEL NO IGNITION
As the engine cranking begins, the DE-3000 system implements the engine
purge cycle. The first engine purge cycle consists of a programmed roll time, 0
to 10 seconds (5 second typical), without fuel or ignition.
STATE 4: PURGE 2 NO FUEL WITH IGNITION
The second engine purge cycle is an additional programmed time from 0 to 10
seconds with the ignition firing and no fuel being supplied while still cranking.
STATE 5: STARTING FUEL AND IGNITION ON
After a total purge time of ten seconds, both ignition and fuel have been enabled
via outputs #1 and #2 of the power supply module and the engine should begin
running.
STATE 6: ENGINE STARTED
As the engine speed increases, the user programmable CRANK DISCONNECT
speed switch function will automatically disable the starter at the selected RPM
by de-energizing OUTPUT #3. This is the beginning of system STATE 6 on the
sequence chart. If the crank disconnect RPM is not reached within a user pro-
grammed time period after the cranking output is energized (15 to 99 seconds),
an OVERCRANK FAULT will be generated. The OVERCRANK FAULT will turn off
the fuel and ignition and disable the starter until a new AUTO START command
is received returning the system to STATE 0. If the DE-3000 is set up for Multi-
Start, then a delay timer will begin counting down before another start attempt
is automatically triggered. Pressing any button on the display during the time
between start attempts will cancel Multi-Start, and the DE-3000 will remain in
a Stop/Fault mode until it is manually restarted.
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