Install Manual

Installation Drawings
Installation Guidelines for Protector Diesel Generators 53
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. Figure 8-3 describes the
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.
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.
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 Figure 8-2
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.
Figure 8-2. Stator Power Winding Connections—
3-phase, 277/480V (6 Lead)
Figure 8-3. Stator Power Winding Connections—
3-phase, 277/480V (12 Lead)
A Neutral B Circuit breaker
44
120 VAC
240 VAC
120 VAC
E3
E1
00
33
22
11
006477
A
B
A Neutral B Internal connections
E1
S1
S6
S5
S4
S2
E2
S3
E3
L - N
L - L
00
006478
B
A
E1
S1
S4
S7
S12
S11
S10
S8
S5
S2
E2
S9
S6
S3
E3
L - N
L - L
006479