Goulds Pumps VS - IOM - Manual (Page 26)

18
c. THE CURRENT UNBALANCE BETWEEN
LEGS SHOULD NOT EXCEED 5% at service
factor load or 10% at rated input load. If the
unbalance cannot be corrected by rolling
leads, the source of the unbalance must be
located and correct.
d. By observing where the furthest current reading
from the average is for each leg of each of the
hookups, the cause of the unbalance can be
determined. If the leg furthest from average is
always on the same power lead, this indicates
that most of the unbalance is from the power
source. If the leg furthest from average is
always on the same motor lead, the primary
source of unbalance is on the “motor side” of
the starter. In this instance, consider a dam-
aged cable, leaking splices, poor connection, or
faulty motor winding.