Rating: The curves on the
rating graph represent the maximum unbalance of weld currents
expressed in percent (%), which the weld current equalizers can
balance as a function of the maximum secondary voltage available
from the welding transformer. The process of determining the
required rating is shown in the following examples. 
Example 1
 Maximum Secondary Voltage 7.5 Volts
 Welding Current in Loop 1 15,500 A
 Welding Current in Loop 2 14,000 A
 Unbalance 15,50014,000 = 1,500 A
 % Unbalance 1,500 / 14,000 X 100 = 10.7%*
 From Rating Curve: Use RWE 7/15

Example 2
 Maximum Secondary Voltage 11.5 Volts
 Welding Current in Loop 1 16,200 A
 Welding Current in Loop 2 18,400 A
 Unbalance 18,40016,200 = 2,200 A
 % Unbalance 2,200 / 16,200 X 100 = 13.6%*
 From Rating Curve: Use RWE 12/15
*NOTE: the percent unbalance must be based on the lower
weld current representing 100%


Rating Graph

Selection
 Determine maximum secondary voltage of the transformer used and
locate voltage on rating graph
 Determine % unbalance
a. For existing installations, use data
from actual measurements.
See
examples under Rating.

b. For new installation, assume % unbalance
from prior
experience,
generally between 10 to 15%.

 Bring voltage and % unbalance to intersect on rating
graph, select
RWE 7/15 series equalizer for points to the left of curve marked RWE
7/15. Select RWE 12/15 series equalizer for points falling
between curves marked RWE 7/15 and RWE 12/15
 Determine secondary lug configuration of transformer used.
RWMA inline Lugs (Bulletin F1,
F3) 
RWMA staggered lugs (Bulletin F2.1,
F4) 
RoMan staggered lugs (Bulletin F2,
F4) 
 Select the model number of the weld current equalizer from the
selection table using the appropriate columns determined in Steps 3 and
4

