Farymann Diesel 37E, Repair Manual

Page: 59 / 73

ELECTRICAL SYSTEM
59
10. Electrical System
10.1 Flywheel - Dynamo / Governor
Operation:
The permanent magnets in the
magnet holder (1) on the fly-
wheel side induce an alternating
voltage in the coils of the stator
(2): this voltage is proportional
to speed (RPMs). The alternat-
ing voltage is rectified in the
governor (3) and continuously
regulated to approximately 14.2
- 14.5 V.
Connections to the Governor:
•
2x yellow
 Generator coils, input, interchangeable
•
1x red

Output, charging current
•
1x brown
 Charge control, Terminal 15, ignition
lock
Connection to earth is made via the assembly surface.
Function Tests:
a) Alternating voltage at the coil output
Disconnect the connecting plug (4).
The voltage proportional to speed is measured on the two phases (2x black).
Set values: Graph A, "Idling Voltage without Governor Cut-Out"
b) Coils = single phase to earth
c) Charging current, governor output
Connect a suitable ammeter (I
max
=30A) into the charging circuit (red cable).
The charging current depends on the speed and the state of the battery charge. Graph
B, “Charging Current”.
d) Charge control circuit
If the electrical system is intact, the charge control indicator must go out in the speed
range from 600-800 revolutions/min.