OPERATION | PAGE 10
4. OPERATION
4.1 STARTING THE ENGINE
Under the conditions for activating the control unit, proceed to perform the
following engine start procedure:
1. Start delay. Once activation conditions are detected, it is possible to program
a time delay (Times table, parameter 3) before continuing the engine start up
procedure. This delay only applies to engine starts in automatic mode.
2. Preheating of the engine (PR). The control unit activates preheating output
(PR) for the programmed time (Times table, parameter 4). The control unit allows
programming of a temperature threshold (Thresholds table, parameter 48) of the
coolant sensor that interrupts the preheating process, before proceeding with
the engine start up.
3. Enabling the starting of the engine (positive contact activation). Enabling
the starting of the engine (positive contact activation) is performed via the
measurements module PC output. The output supports a Stop by De-energisation
conguration (output activation during engine operation) or Stop by Excitation
(engine stop pulse -Table times, parameter 12) or by PULL excitement of a starter
solenoid (1 second pulse during engine startup). The operating mode of the
enabled output can be set (Times table, parameter 18).
For groups with engine conguration by De-excitation Stop (Regulations table,
parameter 18, value 0), there is a 2.5 second engine delay between the engine
being enabled and the activation of the start-up: the delay is reduced to 0.5
seconds unless the Immediate Start-up conguration is activated (Regulations
table, parameter 31).
4. Starting the engine (ARR). For a maximum time (Times table, parameter 5),
the start output of the measurements module is activated while waiting to detect
at least one of the programmed start conditions. The possible engine starting
conditions are:
• Generator voltage (Regulations table, parameter 19). The engine
is considered started when a certain generator voltage is exceeded
(Threshold table, parameter 20).
• Alternator voltage (Regulations table, parameter 20). The engine is
considered started when a certain battery charging alternator voltage
is exceeded (Threshold table, parameter 21).
• Engine speed (Regulations table, parameter 21). The engine is
considered started when a certain speed is exceeded calculated
through pickup (Table thresholds, parameter 22) or obtained through
the engine electronics for the J1939 bus. To activate the pickup
calculation via the engine ring gear, it is necessary to enter the number
of teeth on the engine's ywheel ring gear (Threshold table, parameter
24); if the number of teeth for the ywheel ring gear is zero, the engine
speed is calculated via the generator frequency according to the ratio
50Hz/1500rpm, 50Hz/3000rpm or 60Hz/1800rpm (Regulations
table, parameter 26).
• Low Oil Pressure Signal (Regulations table, parameter 22). Due to its
characteristics, it is not advisable to use the low oil pressure signal to
detect if the engine is running, but its use is recommended as protection
against a restart, as the engine is already running. Exceptions to this
engine start detection are SCANIA engines and sensors that have their
own power source.
5. Generator stabilisation. Once any start-up condition is detected, the control
unit waits for a xed time for stabilization of the generator signal before
monitoring the quality of the generator signal.
6. Rated condition. After achieving engine stabilisation, verication of the
generator signal is performed. In this state, the quality of the signal produced by
the genset is evaluated (voltage levels, frequency,...).
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