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Installation
2–14 975-0059-01-01 Rev A
Wiring for a 240 Vac-Only Input Source
A 240 Vac source does not allow for the connection to the input of a 120 Vac
inverter as no neutral line is supplied from the utility or generator. In order to use
stacked inverters, a neutral line must be added by using a center-tapped
autotransformer (such as a T240) on the inverter’s input. This will create the
necessary neutral return line for the inverters, and half the voltage for each
inverter to 120 Vac. The output of the inverter supplies both 120 and 240 Vac to
the loads.
The ISC-S cable and autotransformer (capable of handling the system’s power
requirements) are required in this configuration..
To wire the inverters for a 240-Vac only input source:
1. Run G
ROUND wires (green):
a) from the AC Distribution Panel to the primary earth/ground connection.
b) from the generator ground to the AC Distribution Panel ground.
c) from the ground terminal in the Autotransformer to the AC Distribution
Panel.
d) from the AC Distribution Panel to the Ground bar in the L1 inverter.
e) from the AC Distribution Panel to the Ground bar in the L2 inverter.
2. Run NEUTRAL wires (white):
a) from the center-tapped neutral connection in the autotransformer to the
NEUTRAL 1 terminal in the L1 inverter.
b) from the center-tapped neutral connection in the autotransformer to the
NEUTRAL 1 terminal in the L2 inverter.
c) from the NEUTRAL OUT on the L1 inverter to the NEUTRAL 2
terminal on the L2 inverter.
d) from the Neutral OUT on the L2 inverter to the Neutral terminal in the
AC Distribution Panel.
3. Run HOT wires:
a) (black) from the L1 Output in the generator to the L1 terminal in the
Autotransformer.
b) (black) from the L1 output terminal in the Autotransformer to the
AC2 GEN terminal in the L1 inverter.
c) (black) from the INV OUT terminal in the L1 inverter to the L1 input
terminal in the AC Distribution Panel.
d) (red) from the L2 Output in the generator to the L2 terminal in the
Autotransformer.
e) (red) from the L2 output terminal in the Autotransformer to the AC2 GEN
terminal in the L2 inverter.
f) (red) from the INV OUT terminal in the L2 inverter to the L2 input
terminal in the AC Distribution Panel.
4. Torque all inverter terminal block connections to 25 inch-pounds.