General Information; Generator Ac Lead Connections; Four-Lead, Single-Phase Stator; Alternator Power Winding Connections - Generac Power Systems 20kW Owner's Manual

GENERATOR AC LEAD CONNECTIONS

See "Voltage Codes". This generator may be rated
at any one of three voltages, either single-phase or
three-phase. The electrical wires in the unit's AC con-
nection (lower) panel should be installed according to
the number of leads and the voltage/phase required
for the application. If there are any questions regard-
ing 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 generators (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
Standby Generator Sets

General Information

ALTERNATOR POWER WINDING
CONNECTIONS

3-PHASE ALTERNATORS

The generator is designed to supply 3-phase electri-
cal loads. Electric power is produced in the alterna-
tor 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.
Connections - 3-phase, 277/480V (6 Lead)
Connections - 3-phase, 120/208V (6 Lead)
7-1
Figure 7.2 — Stator Power Winding
S1 E1
INTERNAL
CONNECTIONS
S6 S4
S5
E3 S3
Figure 7.3 — Stator Power Winding
E1
S1
S4
S6
S3
S6 S5
E3
S3
L-L
NEUTRAL
S2 E2
L-N
S1
L-L
S4
00 (NEUTRAL)
S5
S2
E2
S2
L-N
08/05 0 Rev. ACConn001