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ALTERNATOR AC LEAD CONNECTIONS
See “Voltage Codes”. This Stationary Emergency
Generator may be rated at any one of three voltages,
either single-phase or three-phase. The electrical
wires in the unit’s AC connection (lower) panel should
be installed according to the number of leads and the
voltage/phase required for the application. If there
are any questions regarding lead connection, refer to
the wiring diagrams at the back of this manual.
Voltage codes apply to the type of stator assembly
installed on a particular generator.
FOUR-LEAD, SINGLE-PHASE STATOR
Four-lead alternators (see Figure 7.1) 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 con-
nected at the factory to the main circuit breaker as
shown in Figure 7.1.
The rated voltage between each circuit breaker ter-
minal is 240V. The rated voltage between each circuit
breaker terminal and the neutral point 00 is 120V.
Figure 7.1 — Four-lead, Single-phase Stator
ALTERNATOR POWER WINDING
CONNECTIONS
3-PHASE ALTERNATORS
The Stationary Emergency Generator is designed
to supply 3-phase electrical loads. Electric power is
produced in the alternator power windings. These
windings were connected at the factory to the main
circuit breaker with a “Y” configuration as shown in
Figures 7.2 and 7.3.
The rated voltage between circuit breaker terminals
E1-E2, E1-E3 and E2-E3 is either 480V or 208V
depending on the model.
The rated voltage between each circuit breaker termi-
nal and the neutral point 00 is either 277V or 120V
depending on the model.
Figure 7.2 — Stator Power Winding
Connections - 3-phase, 277/480V (6 Lead)
S6
E
3
S3
INTERNAL
CO
NNE
C
TI
O
N
S
L-
N
L
-
L
S4
E2
S2
S5
S1
E1
NE
U
TRA
L
Figure 7.3 — Stator Power Winding
Connections - 3-phase, 120/208V (6 Lead)
E
3
E2
00
(
NEUTRAL
)
E1
L
-
L
L
-
N
S1
S1
S4
S4
S
6
S6
S3
S3
S5
S5
S2
S2
7-1
Stationary Emergency Generator
General Information
ACConn001 Rev. A 10/08