Alternator Ac Lead Connections; Four-Lead, Single-Phase Stator; Alternator Power Winding Connections; Three-Phase Alternators ("Y" Configuration) - Generac Power Systems Protector Series 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 volt-
age 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.
tor power winding connection for the generator.

Four-Lead, Single-Phase Stator

See Figure 10-1. Four-lead alternators are designed to
supply electrical loads with voltage code "A" (240V, sin-
gle-phase, 60 Hz). Electrical power is produced in the
stator power windings. These windings were factory-con-
nected to the main circuit breaker as shown.
44
33
22
11
B
A Neutral
Figure 10-1. Four-Lead, Single-Phase Stator
Rated voltage between each circuit breaker terminal is
240V. The rated voltage between each circuit breaker ter-
minal and the neutral point 00 is 120V.
Installation Guidelines For Spark-Ignited Stationary Generators
Figure 10-3 describes the sta-
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 sup-
ply three-phase electrical loads. Electric power is pro-
duced in the alternator power windings. These windings
were factory-connected to the main circuit breaker with a
"Y" configuration as shown in
ure 10-6.
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 10-2. Stator Power Winding Connections—
Three-Phase, 277/480V (6 Lead)
S1
S12
S9
S6
S3
E3
Figure 10-3. Stator Power Winding Connections—
Three-Phase, 277/480V (12 Lead)
Installation Drawings
Figure 10-2 through
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
Fig-
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