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Installation
Caution: Separate over-current protection may be
required by the National Electrical Code. The
installer of this equipment is responsible for
complying with the National Electrical Code
and any applicable local codes which govern
such practices as wiring protection,
grounding, disconnects, and other current
protection.
The inverter is self protected from normal AC line transients and
surges. Additional external protection may be required if high
energy transients are present on the incoming power source.
These transients could be caused by sharing a power source
with arc welding equipment, large motors being started across
the line, or other industrial equipment requiring large surge
currents. To prevent inverter damage due to power source
disturbances the following should be considered:
1. Connect the inverter on a feeder line separate from those
supplying large inductive loads.
2. Supply power to the inverter through a suitably sized
isolation transformer. When using an isolation transformer
to power the inverter, always switch the power off and on
between the transformer secondary and the inverter input to
avoid spikes at the inverter when power is removed from
the primary side.
3. Supply power to the inverter through a suitably sized line
reactor. Line reactors serve several purposes:
4.
A. Minimize voltage spikes from the power line that may
cause the inverter to trip on over-voltage.
B. Minimize voltage harmonics from the inverter to the
power line.
C. Provide additional short circuit capability at the inverter.