Amada 1-288-01, Operation Manual, Page: 81 / 144

CHAPTER 5. OPERATING INSTRUCTIONS
HF28 DC RESISTANCE WELDING SYSTEM
990-372 5-17
Section VI. Pre-Weld Check
Note: The
Pre-Weld Check
function is used to detect misaligned or missing parts before the weld is
performed. Therefore, the Pre-Weld Check function should only be programmed after the welding
schedule has been developed. The welding schedule includes the time and energy settings as well as the
electrode force required to produce strong, consistent welds.
1. Press the
SCHEDULE
key, then select a Weld Schedule using
either
the

arrows
or
the numeric keypad.
2. Program the second pulse as required to produce strong, consistent welds. Then, program the
first pulse for
Constant Current
operation. Program the first pulse current level to
approximately 10% of the second pulse current. Program the first pulse upslope time to 1 ms
and first pulse weld time to 2 ms. Program 2 ms of cool time between the pulses. Make a few
welds and verify that the welds are strong and consistent.
3. From the
MONITOR
keys section on the front panel, press the voltage
V
key and observe
the peak voltage reading of the first pulse. Make several more welds and observe the
range of first pulse peak voltage readings from weld to weld.
4. 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 voltage level that is slightly higher than the voltages observed in step 3 above.
5. Press the voltage
V
key to save the setting as an upper voltage limit.
6. 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
7.
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.
8. Press the voltage
V
key to save the setting as a lower voltage limit.
9. Make several more welds and verify that under normal circumstances, the limits are not
reached and the welds are not aborted. If the limits are reached under normal welding
conditions, adjust the levels and times of the upper and lower voltage limits accordingly.
10. Return to the
RUN
screen and make several welds. Observe that under normal
conditions, the welds are not aborted, and that consistent, strong welds can be produced.