APPENDIX A: TECHNICAL SPECIFICATIONS
PHASEMASTER™ 6 DIRECT ENERGY WELDING CONTROL
990-083
A-3
Weld Current
Weld Current is measured as the percentage of the maximum current which could flow during each half-
cycle of the Weld Period. The welding current is controlled by a Linear Current Control Circuit which
proportions time so that heating effect is directly proportional to the
square
of the integral of the
welding current. For exa mple, ignoring losses, if the %CURRENT is increased from 80 to 90%, the
welding energy will increase from 64% to 81% of the maximum. % CURRENT can be set from 20 to
99% in 1% steps. Welding quality will improve if %CURRENT is set between 65% and 85%. The
accuracy (linearity) of the %CURRENT is ±3% of setting.
Hold Period
Hold Time is measured as the number of cycles of the AC power source, after the end of the Weld
Period for which an air actuated weld head will continue to apply force to the workpieces. In resistance
brazing or soldering applications, the Hold Period provides time for the brazing alloy or solder to
solidify. Hold Time is seldom used in welding applications where the electrodes are not water cooled
and where the Weld Time is less than 5 or 10 cycles. In these applications Hold Time allows the
electrodes to cool the workpiece. HOLD Time can be set from 0 to 99 cycles in 1 cycle increments.
HOLD Time has no meaning when used with a Manual Head.
Automatic Line Voltage Compensation
Automated Line Voltage Compensation will, when switched to ON, increase the %CURRENT by 1 for each
1%
decrease
in line voltage from the rated nominal voltage. The %CURRENT will be decreased by 1 for
each 1%
increase
in line voltage. This Compensation is limited to maximum line voltage changes of 13%.
The PM6 cannot compensate for more than a 13% decrease in line voltage when the %CURRENT is set
above 86%. It cannot compensate for more than a 13% increase in line voltage when the %CURRENT is
set below 33%. The amount of Compensation is calculated immediately before the Weld Period starts.
To change the status of the Automatic Line Voltage Compensation Feature, select [NO WELD] and
Schedule 0. To switch this Feature to ON, press [SAVE] and then press [
=
]. "LC On" will be briefly
displayed. To switch this Feature to OFF, press [SAVE] and then press [
<
]. "LC OFF" will be displayed.
NOTE:
The Automatic Line Voltage Compensation Feature should be switched to OFF when the PM6 is
being used to develop weld schedules.
