13
B A S I C S E Q U E N C E
The following is one complete pass through a weld schedule. To be complete we will begin with Power to
the Machine turned OFF.
1.
TURN ON THE POWER -
The P280 will remain dark for about 1-2 seconds, the line frequency (60)
will be displayed for 1 second, and then the display will either be “00” or “88”. The “00” indicates the first
weld schedule. The “88” indicates the footswitch is depressed.
2.
WELD SCHEDULE # (0-99)
– Enter the number of the desired weld schedule in display window.
Depress Key B one time to advance the control to the next location. The
WELD SCHEDULE LED
will
light.
3.
SQUEEZE (0-99)
– The time allowed to lower the upper electrode to the material and stabilize the weld
pressure is
SQUEEZE
. One cycle is 1/60
th
of one second or .0167 seconds. Enter the number of cycles
desired. Depress Key B.
SQUEEZE OFF. IMPULSES ON.
4.
COOL TIME (0-99) –
A cooling period, measured in cycles, occurring between each impulse, when
using multiple impulses.
5.
IMPULSES (0-99)
– The weld cycle consists of a sequence of heating and cooling commands and the
command
IMPULSES
, then determines the number of times the heat/cool sequence occurs for the weld
schedule. Depress Key B.
IMPULSES OFF. UP% CYCLES OFF, UP MAX% ON.
6.
UP % / Cycle (0.1 to 9.9)
– The
UP%
parameter is also called
UPSLOPE.
The control will start this
command at zero % heat and increase at the rate selected by this parameter. For further discussion of this
variable, refer to end of the section. Depress Key B.
UP % / CYCLE OFF, UP MAX % ON.
7.
UP MAX % (0-99)
– This is the percent of weld power to be reached at the end of the UP Slope.
Depress Key B.
UP MAX. OFF, HEAT % ON.
8.
HEAT % (0-99) –
This is the number of cycles of weld current in one heat/cool cycle Depress Key B.
HEAT OFF, HEAT% ON.
9.
HEAT % (0-99)
– 0 TO 99 percent of available current is selected in this parameter. Depress Key B.
HEAT % OFF, DN% / CYCLE ON.
10.
DOWN % / Cycle (0.1 to 9.9)
– This is a Down Slope parameter. It operates the same as Up Slope,
except it begins with
HEAT %
value and slopes down to the
DOWN MIN %
value. The percent per cycle
step works the same. Depress Key B,
DN MIN %, HOLD ON.
11.
HOLD TIME (0-99)
– This timing function allows the weld pressure to remain after the current is
removed for cooling. Depress Key B.
HOLD OFF, OFF ON.
12.
OFF TIME (0-99)
– This timing function holds the return to
HOME
position for a fixed time. This
time is useful in the
REPEAT
mode. Depress Key B.
OFF, WELD SCHEDULE ON.