intervolt DCC Pro Installation & Operation Manual page 39

Ignition control mode: In this mode the DCC Pro has two optional settings.
These settings allow the DCC Pro to be used in traditional vehicles with
conventional charging methods or the new ECU controlled systems used in
modern design. The NORMAL setting is provided for the former and the LOW for
the latter. In ignition mode the start-up voltage is the same value in both
NORMAL and LOW settings and is set to 12.5V (remember this is the voltage
level of the main battery). In order to conserve power, the DCC Pro will NOT
commence charging, even with the ignition ON if the main battery has a
voltage level below 12.5V. The di erence between the settings is the low
voltage cut-out limit. These limits are set as follows:
1. NORMAL: 12.0VDC
2. LOW: 11.8VDC
If the main battery falls below these levels the DCC Pro will stop charging
immediately in order to protect it from further discharge.
CHARGING METHODS - Battery to Battery
Boost: The boost stage, also known as bulk charge (and other pseudonyms) is
the stage when the Charging Device is producing the heavy current required in
order to re-charge a depleted battery as quickly as possible. The boost voltage
is determined by the battery type selected in the initial set-up phase. The boost
stage is controlled by an algorithm of time vs voltage vs temperature to ensure
that the battery is charged optimally under the given conditions. In boost stage
the charger is operating in constant current (CC) mode and will produce up to
25 Amps (maximum) subject to the aforementioned conditions. When the
Charging Device is powered up and the auxiliary battery measures 12.0V or
below the boost stage is then initialised. At this point the 'soft start' function is
also enabled (see page 7 for detailed information) and current ows. The boost
stage is completed or terminated under the following conditions:
• when the auxiliary battery reaches terminal voltage
(pre-determined by the battery type selected) ; or
• the maximum boost time has expired before the
battery has reached terminal voltage; or
• the charge current is reduced to less than 5 Amps
(20% of maximum charge current).
In the instance where the boost time has expired before reaching terminal
voltage, the charging process will skip the next (absorption stage) and progress
directly to the nal ( oat) stage. Generally this occurs when the auxiliary battery
is damaged or no longer serviceable.
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