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Starter battery charging procedure (battery I)
Parallel circuit
Driving operation
During driving operation, the starter battery (battery I) is charged by the
generator of the vehicle. As long as the generator is running and there is a
voltage on the input D+ (contact 18) of the power supply, the supply battery
and the starter battery are in parallel operation. The supply battery is also
charged by the generator. If there is no voltage at the D+ input of the power
supply, the parallel connection is turned off if the voltage falls below 13.2 volt.
Mains operation (all voltage values with respect to a battery temperature of 20° C)
When connecting to the mains of 230 volt, the supply battery is charged first.
Once the supply battery reaches a voltage of 14.3 volt, it is switched in parallel
with the starter battery. If the charging current rises to its rated value due to a
user and the battery voltage falls below 13.2 volt, then the parallel connection
is automatically disconnected. The starter battery thus always remains ready to
start.
Solar operation
When connecting external solar cells, the starter battery is also charged
provided that the voltage of the supply battery has reached 14.3 volt. If the
voltage of the supply battery drops below 13.2 volt, the parallel circuit is
disconnected again.
12 volt outputs
Function display
The function display (contact 1) delivers a 12-volt signal for display purposes.
Its maximum load is 20 mA when the power supply is in the main charging,
post charging or holding charge phase.
Users
The outputs to the users (contact 3 and 10) only carry +12 volt if the user relay
has switched on. The user relay only switches on if + 12 volt control voltage is
applied to contact no. 14 of the 15-pole plug.
Refrigerator
When the engine is running, the refrigerator is supplied with power via the
generator of the vehicle. After the engine is switched off, the refrigerator relay
disconnects the refrigerator (contact 5) from the supply battery. The control
action is via the cable from the D+ of the generator (contact 18). Thus,
operating the refrigerator at 12 volt is only possible during journeys. When the
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