Operator`s manual

LTW 20Z Operation

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3.18 Load Balancing

Overview

To help in balancing loads, each outlet on the LTW20Z3 is marked with the

phase(s) to which it is connected.

When connecting single phase loads to the LTW20Z3, it is important to balance the

loads, especially if the machine is also powering three phase loads. Unbalanced

single phase loads cause unequal three phase line voltages.

Unequal line voltages applied to a three-phase induction motor produce

unbalanced currents. This condition increases the motor temperature compared to

a motor operating with balanced line voltages.

NOTICE: If line voltages are unbalanced, the motor horsepower rating will be der-

ated in accordance with NEMA MG 1 Part 14.

a Derating factor

b Percent of voltage unbalance

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