C.E. Niehoff & Co. N1388-1 Troubleshooting Guides User Manual
Page 2
Page 2
TG0047A
Section A: Wiring Diagrams
Figure 3 — N1388-1 Alternator with N3012 Regulator
Figure 2 — N1388-1 Alternator Terminals
(N3012 Regulator Attached to Alternator)
B+ terminal
T
Diagnostic
receptacle
CEN N1388-1 Alternator
Description and Operation
N1388-1 28 V (300 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. Load-dump protection limits peak voltage
to less than 55 volts during maximum load change
over speed range in batteryless operation. Peak ampli-
tude of voltage including ripple during normal battery-
less operation is less than 40 volts. Radio noise sup-
pression is in accordance with Mil-Std 461A, Notice 4
RE05 and CE07.
Ignition switch energizes regulator, and then field coil
is energized. Voltage adjustment is available on alter-
nator control unit.
N3012 regulator furnished with this unit is flat tem-
perature compensated at 28.1±0.15 V at 72 F.
B– terminal
T
T
T
T
Regulator
receptacle
T
Energize
receptacle
T
Voltage
adjust plug
receptacle
Figure 1 — N1388-1 Control Assembly