Key Or No Key Selectable Use; Use Of Devices With High Current Absorption; Connection Diagram For Avoiding Alternator Loading; Direct De-Energizing Of The Alternator - Littelfuse 08096500 Series Manual

8.3.2.3 - Key or no key selectable use

In this specifi c case it is instead possible to select, by means of a supplementary switch, battery switch
operation without key, similar to the preceding paragraph, or by key, as provided for standard operation.
For connections see the diagram set out in Picture 5 (
8.3.3 - Use of devices that have high current absorption
The battery switch, in the presence of a high current absorption device, for example electric tail-lifts, air
conditioner, pre-heater plugs or electromagnetic brake could tend to activate the automatic deactivation
phase due to the consequential drop in voltage.
If you wish to avoid this intervention, that is if you wish to obtain automatic exclusion, it is necessary to connect
these devices using the PVM 4 module as described in Picture 6 (
Exclusion will activate when at least one of the four PVM 4 inputs are connected to positive by means of the
device switch. It is however always possible to completely exclude the automatic intervention function (see §
6.2.3.1) by moving S into the "MANUAL" position.
M-A

8.4 - Connection diagram for avoiding alternator loading

With the battery switch OFF and with the thermal motor running the vehicle electrical system would remain
live due to alternator input. To eliminate the alternator load the battery switch is equipped with an unprotected
system earth NC Auxiliary contact (brown wire): connection of the auxiliary contact can be realized in many
ways depending on the type of alternator installed on the vehicle.
It is, however, advised to use a supplementary relay, controlled by the auxiliary contact, in
that in the event of incorrect connection it would render the battery switch completely unserviceable.

8.4.1 - Direct de-energizing of the alternator

8.4.1.1 - Vehicles having alternators with incorporated regulators in the brush-holders
To de-energise the alternators with regulators incorporated in the brush holders, it is necessary to connect
the battery switch brown wire directly to the D+ alternator terminal. This operation is carried out prior to
battery isolation to avoid overloads typical of battery disconnection with engine running.
Refer to the diagram set out in Picture 7 (
the D+ take-off point must be on the relative alternator terminal and not on the warning light or
under the control panel in that these lines could have diodes or resistors that could inhibit operation.
if the alternator is not suitable for director de-energizing, of the relay inside the battery switch is not
suitable for the application, short-circuit of D+ to earth could cause damage to the alternator (e.g. broken
regulator), or to the system (e.g. burned earth connection) or to the battery switch, which would render it
unserviceable.
8.4.1.2 - Vehicles having alternators with regulators not incorporated in the brush-holders
To de-energize the alternators with the regulators incorporated in the brush holders it is necessary to use a
supplementary relay whose coil is controlled by the battery switch auxiliary contact. The NA contact of such
relay, suitably sized, will be used to recreate the interrupted connection between regulator DF and alternator
DF. This operation is carried out prior to battery isolation to avoid overloads typical of battery disconnection
with engine running.
Refer to the diagram set out in Picture 8 (
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for the connections.
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for the connections.
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