Amada 1-288-01, Operation Manual, Page: 85 / 144

CHAPTER 5. OPERATING INSTRUCTIONS
HF28 DC RESISTANCE WELDING SYSTEM
990-372 5-21
Section VIII. Weld Stop
NOTE:
The
Weld Stop
function is similar to the
Pre-Weld Check
function, as both are used to detect
missing or misaligned parts. Both functions are used to stop the weld when a specific
current
,
voltage
,
or
power
level is reached. The Weld Stop function stops the weld in the actual welding pulse; the Pre-
Weld Check uses a small pre-pulse to stop the weld. The Weld Stop 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 Current
weld is used as an example to show how the Weld Stop 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 Current
operation as required to make strong, consistent
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
V
(voltage) key and observe the voltage waveform.
5. Observe the peak and average readings on the voltage monitor screen. Make several more
welds and observe the range of voltage 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
an upper voltage limit that is slightly above the peak voltage readings observed in step 5
above.
7. Press the voltage
V
key to save the setting as an upper voltage 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 Pulse 1)
NUMBER Select, Page, RUN or MENU
10. Toggle the Pulse 1 weld key to highlight the
lower
limit field for the Pulse 1 weld
period. Use the numeric keypad to enter a
lower limit
value with a voltage level that is
slightly lower than the voltages observed in step 3 above.