Amada HF-2500A - Page 83

CHAPTER 5. OPERATING INSTRUCTIONS
HF-2500A HIGH FREQUENCY WELD CONTROL
990-371 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