Baldor ID101F50-E manual B. Minimize voltage harmonics from the inverter to the power line

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.

2-4 Installation