Rex: Excitation resistor 12 V systems: 47 Ω 4 W
24 V systems: 100 Ω 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 volt-
age (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.
If a stop coil is used, the REX resistor can be connected to the starter relay (crank).
AGC 100 installation instructions
4189340752 UK
Wiring
DEIF A/S Page 15 of 28
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