|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.
- Maximum Secondary Voltage 7.5 Volts
- Welding Current in Loop 1 15,500 A
- Welding Current in Loop 2 14,000 A
- Unbalance 15,500-14,000 = 1,500 A
- % Unbalance 1,500 / 14,000 X 100 = 10.7%*
- From Rating Curve: Use RWE 7/15
- Maximum Secondary Voltage 11.5 Volts
- Welding Current in Loop 1 16,200 A
- Welding Current in Loop 2 18,400 A
- Unbalance 18,400-16,200 = 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%
- 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.
examples under Rating.
|b. For new installation, assume % unbalance
generally between 10 to 15%.
- Bring voltage and % unbalance to intersect on rating
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 F-1,
|RWMA staggered lugs (Bulletin F-2.1,
|RoMan staggered lugs (Bulletin F-2,
- Select the model number of the weld current equalizer from the
selection table using the appropriate columns determined in Steps 3 and