Alternator Ac Lead Connections; Four-Lead, Single-Phase Stator; Alternator Power Winding Connections; Three-Phase Alternators ("Y" Configuration) - Generac Power Systems D3.4L G16 Extended Tank Installation Manuallines

Alternator AC Lead Connections

The electrical wires in the unit's AC connection (lower)
panel should be installed according to number of leads
and voltage/phase required for the application. The
voltage and phase are described on the generator data
label. The number of lead wires can be identified using
the Specifications section and power output rating on the
generator data label. For example, if generator produces
130kW, 277/480 volt, three-phase power, generator has
12 alternator output leads.
stator power winding connection for the generator.

Four-Lead, Single-Phase Stator

See Figure 8-1. Four-lead alternators are designed to
supply electrical loads with voltage code "A" (240V, 1-
phase, 60 Hz). Electrical power is produced in the stator
power windings. These windings were factory-connected
to the main circuit breaker as shown.
44
33
22
11
B
A Neutral
Figure 8-1. Four-Lead, Single-Phase Stator
Rated voltage between each circuit breaker terminal is
240V. The rated voltage between each circuit breaker
terminal and the neutral point 00 is 120V.
Installation Guidelines for Protector Diesel Generators
Figure 8-3 describes the
E3
A
120 VAC
240 VAC
00
120 VAC
E1
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B Circuit breaker
Alternator Power Winding
Connections

Three-Phase Alternators ("Y" Configuration)

The Stationary Emergency Generator is designed to
supply three-phase electrical loads. Electric power is
produced in the alternator power windings. These
windings were factory-connected to the main circuit
breaker with a "Y" configuration as shown in
through Figure 8-6.
Rated voltage between circuit breaker terminals E1–E2,
E1–E3 and E2–E3 is 480V, 208V or 600V depending on
model.
Rated voltage between each circuit breaker terminal and
the neutral point 00 is 277V, 120V, or 346V depending on
model.
B
S3
E3
A Neutral
Figure 8-2. Stator Power Winding Connections—
3-phase, 277/480V (6 Lead)
S1
S12
S9
S6
S3
E3
Figure 8-3. Stator Power Winding Connections—
3-phase, 277/480V (12 Lead)
Installation Drawings
Figure 8-2
E1
S1
L - L
S4
A
S6
00
S5
S2
E2
L - N
B Internal connections
E1
S4
S7
L - L
S10
S8
S11
S5
S2
E2
L - N
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