C.E. Niehoff & Co. N1380-2 Troubleshooting Guides - Manual (Page 2)

Page 2
TG0037A
Section A: Wiring Diagrams
B– terminal
bolt
Regulator
receptacle
Figure 2 — N1380-2 Alternator with N3109 Regulator
Figure 1 — N1380-2 Alternator Terminals
Output receptacle
T T T T T
T T T T T T T T T T
CEN N1380-2 Alternator
Description and Operation
N1380-2 28 V (220 A) alternator is self-rectifying.
All windings and current-transmitting components
are non-moving, so there are no brushes or slip rings
to wear out. Ignition switch energizes regulator.
Field coil is then energized.
N3109 regulator used with these units:
• is negative temperature compensated for 28.3
± 0.1 V at 72º F for temperature variation
at –0.1 volt per 10º F.
• provides overvoltage cutout (OVCO). Regulator
will trip OVCO when system voltage rises above
32 V for longer than 2 seconds. OVCO feature
detects high voltage and reacts by signaling relay
in F– alternator circuit to open, turning off
alternator. Restarting engine resets OVCO circuit.