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CHAPTER 5. OPERATING INSTRUCTIONS
HF28 DC RESISTANCE WELDING SYSTEM
5-12 990-372
NOTE :
All lower limits apply only to the Pulse 1 and Pulse 2
WELD
periods. Lower limits
do not cover any upslope or downslope periods. All upper limits apply to the entire Pulse 1
and Pulse 2 periods, including their upslope and downslope periods.
1.
Set an
UPPER LIMIT
and
LOWER LIMIT
using the procedures in
Chapter 4, Using Feedback
Modes and Weld Monitoring . Perform a weld to see how the limits (dotted lines) appear
compared to the weld graph.
2.
Raise or lower the
UPPER LIMIT
and
LOWER LIMIT
as necessary using the procedures in
Chapter 4, Using Feedback Modes and Weld Monitoring.
3.
To lengthen or shorten the time periods, go to the
MONITOR
screen.
4.
Press the
UPSLOPE
key for
PULSE 1
or
PULSE 2
to get the
MONITOR LIMITS
screen.
NOTE:
INGNORE 1st
deletes time
from the beginning of the limit,
IGNORE
LAST
deletes time from the end of the
limit. This will not only shorten the
limit time, but depending on the amount
of time deleted on each end of the limit,
the limit will appear to move
< PULSE 1 MONITOR LIMITS >
1. LOWER LIMIT IGNORE 1ST : 0.0ms
2. LOWER LIMIT IGNORE LAST : 2.5ms
3. UPPER LIMIT IGNORE 1ST : 0.0ms
4. UPPER LIMIT IGNORE LAST : 0.0ms
NUMBER Select an item, RUN or MENU
horizontally across the screen. This
allows you to fit the
LOWER LIMIT
precisely into the waveform graph.
5. Use the numerical keypad to select the number of the limit you want to change.
6. When the value is highlighted (Example:
2.5ms
), use the numerical keypad to type in a new
value. You must leave a minimum time of 0.5 ms in order for the changes to be saved in
memory.
7. Press the
RUN or monitor
key when you have finished entering new values.
8.
Raise or lower the
UPPER LIMIT
and
LOWER LIMIT
as necessary using the procedures in
Section III, Programming the Weld Monitor .
9. Return to the
RUN
screen and make a test weld in order to view the waveform to see where
the new limits appear compared to the waveform graph.
10. Repeat steps 1

10 until the limits are where you want them.
NOTE:
Lower limits apply to the programmed weld time only . Programming a longer
upslope extends the time before a lower limit applies in the monitoring screen.