GC-1F Installation Instructions and Reference Handbook
DEIF A/S Page 20 of 123
Charger alternator connections
The charger alternator can be used as running-feedback in 2 different ways:
1) Using the D+ terminal connected to terminal 12
2) Using the W terminal connected to the RPM input
Rex: Excitation resistor
12 V systems: 47 4 W
24 V systems: 100 6 W
At standstill the battery + is connected to terminal 9 (common), and a current flows to terminal
12 and via the D+ input on the alternator to ground (battery -). When the starter is engaged
(cranking), the battery will supply the D+ through the REX resistor, helping the alternator to
excite. When the alternator starts to produce voltage (excitation OK), the speed of the alternator
will be above running speed, and the voltage on term. 12 will rise to a value higher than the
battery voltage and then interrupt the current flow through REX and activate the running
feedback input. Engine is running.
Usually only one of these possibilities is used.
If a stop coil is used, the REX resistor can be connected to the starter relay
(crank).
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