CHAPTER 4: OPERATING INSTRUCTIONS
UB25 LINEAR DC RESISTANCE WELDING CONTROL
4-10
990-665
8
Press the
COOL
weld period
key. This will bring up the
PULSE 1 OUT OF LIMITS
ACTION
screen.
9
Select
4. APC: STOP PULSE 1/ALLOW PULSE 2.
NOTE:
For details, see "Active Part Conditioner" in
Chapter 3.
10
Since different levels of oxide require different amounts of time to reach the current limit,
return to the
RUN
screen and extend the programmed weld time (usually double the time
works). This will ensure that there will be enough time for the current to rise and reach
the limit, even with heavily oxidized parts.
11
Try welds with varying oxide (clean and dirty). The power supply terminates the first pulse when
your programmed current is reached. A clean part will reach the current limit sooner and the
pulse will terminate early. A dirty part will require more time before the oxide is broken down
and current can flow.
12
Program your second welding pulse as
normal to achieve a strong weld.
Constant voltage is recommended for
round parts and constant current for flat
parts. An upslope may be required to
restrict the current flow early in the
second pulse and avoid weld splash.
PULSE 1 OUT OF LIMITS ACTION
1. none
2. STOP DURING PULSE 1
3. INHIBIT PULSE 2
4. APC: STOP PULSE 1/ALLOW PULSE 2
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