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Onan EM Series - Page 22

Onan EM Series
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120/240 Volt, Single Phase, 12 Lead: Terminal
con-
nection LO can be grounded (neutral). For 120 volts,
connect the hot load wires to either the L1 or L2
connection, Figure 19. Connect the neutral load wire
to the grounded LO connection. Two 120 volt circuits
are thus available, with not more than 1/3 the rated
capacity of the set available on either circuit. If using
both circuits, be sure to balance the load between
them.
For 240 volts, connect one load wire to the L1
connection and the second load wire to the L2
connection. Terminal connection L0 is not used for
240 volt service.
Only 2/3 of rated current is available from this connection.
FIGURE 19. 120/240 V.
1-PHASE
DOUBLE DELTA
120/240 Volt, 3 Phase, Delta Connected Set; 12 Lead:
The 3 phase Delta connected set is designed to
supply 120 and 240 volt,
1
phase current and 240 volt,
3 phase current, Figure 20. For 3 phase operation,
connect the three load wires to generator terminals
Ll,
L2 and L3—one wire to each terminal. For3 phase
operation the L0 terminal is not used.
For 120/240 volt, 1 phase, 3 wire operation, terminals
Ll and L2 are the "hot" terminals. The L0 terminal is
the neutral, which can be grounded if required. For
120 volt service, connectthe black load wire to either
the Ll or L2 terminal. Connect the neutral (white) wire
to the L0 terminal. Two 120 volt circuits are available.
Connect between any two 3-phase terminals for 240
volt
1-phase
loads.
Any combination of
1
phase and 3 phase loading can
be used at the same time as long as total current does
not exceed the NAMEPLATE rating of the generator.
If no 3 phase output is used, usable
1
phase output is
2/3 of 3 phase kVA.
v
-
-£^00 NOT USE THIS
CONNECTION FOR ANY
120 VOLT LOADS.
FIGURE 20. 120/240 V. 3-PHASE DELTA
3 Phase, Wye Connected Set: The 3 phase, 4 wire set
produces line to neutral voltage and line to line
voltage. Line to neutral voltage is the lowervoltageas
noted on the unit nameplate, line to line voltage isthe
higher nameplate voltage.
For 3 phase loads, connect separate load wires to
each of the set terminals
L1,
L2 and L3. Single phase
output of the higher nameplate voltage is obtained
between any two 3 phase terminals as shown in
Figure 21.
The terminal marked LOcan be grounded. For
1
phase
loads,
connect the neutral (white) load wire to the L0
terminal.
Connect the black load wire to any one of
the other three terminals—Ll, L2 or L3. Three
separate
1
phase circuits are available, with not more
than 1/6 the rated capacity of the set from any one
circuit.
If using
1
phase and 3 phase current atthesametime,
use care to properly balance the
1
phase
load,
and not
to exceed rated line current.
Figure 21 shows load connections for 120/208 voitage. Other
voltages are available from either parallel wye or series wye-
illustration in Figure 1.
V
<NL3-^
\ 120
Vo-i
1
208 V
T
Ll
2(j8 V
208 V L2
> «
FIGURE 21. 120/208 V. 3-PHASE WYE
20

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