Trane IntelliPak 2 Series Installation, Operation And Maintenance Manual page 106

U U n n i i t t S S t t a a r r t t u u p p
% Voltage Imbalance =
where;
AV (Average Voltage) =
V1, V2, V3 = Line Voltage Readings
VD = Line Voltage reading that deviates the farthest
from the average voltage.
E E x x a a m m p p l l e e : : If the voltage readings of the supply power
measured 221, 230, and 227, the average volts would
be:
106
VD (reading farthest from average) = 221
The percentage of Imbalance equals:
%
The 2.2% imbalance in this example exceeds the
maximum allowable imbalance of 2.0%. This much
imbalance between phases can equal as much as a
20% current imbalance with a resulting increase in
motor winding temperatures that will decrease motor
life. If the voltage imbalance is over 2%, notify the
proper agencies to correct the voltage problem before
operating this equipment.
RT-SVX24Q-EN