Charger Alternator Connections - THOMSON MEC 310#GENSET CONTROLLER Installation And Operation Manual

The charger alternator can be connected in 2 different ways:
1) Using the D+ terminal connected to terminal 12
2) Using the W terminal connected to the RPM input
Usually only one of these possibilities is used.
MEC 310
Battery
Charge
alternator
Rex: Excitation resistor
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.
If a stop coil is used, the REX resistor can be connected to the starter relay
(crank).
PM075 REV 2 09/08/20
MEC 310 GENSET CONTROLLER

Charger alternator connections

Starter
(crank)
9 23
- +
1N4007
B+ D+
U V W
Stator
Page 13
Running
RPM
feedback
input
17
22 12 18
Rex
W
Brush
Exciter
Coil (rotor)
Brush
Excitation
controller
12V systems: 47 4 W
24V systems: 100 6 W
THOMSON TECHNOLOGY