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CHAPTER 5. OPERATING INSTRUCTIONS
HF28 DC RESISTANCE WELDING SYSTEM
990-372 5-19
Section VII. Weld To A Limit
NOTE:
The
Weld to a Limit
function is used to stop the weld when a specific
current
,
voltage
, or
power
level, sufficient to produce good welds, is reached. Using limits in this way ensures a more
consistent input of energy, which produces consistently good welds for some applications. The Weld to
a Limit function should only be programmed after a welding schedule, which produces acceptable
results, has been developed. The welding schedule includes the time and energy settings as well as the
electrode force setting. In the following steps, a
Constant Voltage
weld is used as an example to show
how the Weld to a Limit function is programmed.
1. Press the
SCHEDULE
key, then select a Weld Schedule using
either
the

arrows
or
the numeric keypad.
2. Program a single pulse for
Constant Voltage
operation as required to make strong welds.
Make a few welds and verify that the welds are acceptable.
3. From the
MONITOR
keys section on the front panel, press the
kA
(current),
V
(voltage),
kW
(power), and
Ω
(resistance) keys and
observe the resulting waveforms.
NOTE
: You can toggle between
PEAK
and
AVERAGE
readings by pressing the
PEAK/AVERAGE
key.
4. Press the
kA
(current) key and observe the current waveform. If the current waveform
is still rising at the end of the pulse, the Weld to a Limit function may work well for the
application. If the current waveform quickly rises and flattens out early in the pulse, the
Weld to a Limit function is not appropriate for the application.
5. Observe the peak current reading on the current monitor screen. Make several more welds
and observe the range of peak current readings from weld to weld.
6. Press the Pulse 1 weld key to highlight the
upper
limit field for the weld period. Use
the numeric keypad to enter the
upper limit
value for the Pulse 1 weld period. Program
a current level that is the same as the peak current readings observed in step 5 above.
7. Press the current
kA
key to save the setting as an upper current limit.
8.
9.
Press the
COOL
weld period
key. This will bring up the
PULSE 1 OUT OF LIMITS
ACTION
screen.
Select
2. STOP WELD
PULSE 1 OUT OF LIMITS ACTION
1. none
2. STOP WELD
3. INHIBIT PULSE 2
4. PART CONDITIONER (Stop Pulse1)
NUMBER Select, Page, RUN or MENU