WTC Technitron T2050 - Weld Schedule Overview

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When a schedule is initiated, the instruction indicator LEDs on
the DEP (Figure 4 on page 5-16, item 3) will cycle down the list of
instructions. This shows which item is currently being executed.
1. The first instruction to execute is SQUEEZE DELAY.
SQUEEZE DELAY will turn on the valve programmed for
that schedule, and then pause for the number of line cycles
programmed. SQUEEZE DELAY only executes the first time
through a repeated schedule. It is available to give a weld
gun time for the initial long stroke typical of a repeated
schedule operation. To turn off SQUEEZE DELAY, enter a
value of 0.
2. Next, the SQUEEZE instruction executes. Squeeze will
energize the valve output (if it was not already turned on by
the SQUEEZE DELAY function). This function pauses for the
programmed number of line cycles so that the gun has time
to close and build pressure. To turn off SQUEEZE, enter 0.
3. After SQUEEZE, the UPSLOPE TIME is executed. UPSLOPE
starts at Slope Initial Current value and slopes up to the Weld
Current value over the UPSLOPE time in line cycles
programmed in the instruction. Turn off UPSLOPE by
entering a value of 0.
4. Next, the weld is made using the parameters entered for
Weld Cycles and Weld Current. To turn off WELD, enter 0 for
Weld Cyc. Weld current (but not weld time) may also be
turned off and on by pressing the NO WELD key, or opening
and closing the WELD input. The control is in No weld mode
(no current) when the NO WELD LED is on.
5. COOL TIME then pauses for the number of line cycles
programmed in the sequence with no heat. To turn off COOL
TIME, program 0 in the instruction.
6. Now, IMPULSES will cause a branch back to WELD TIME if
Pulses is programmed greater than 1. If Weld Pulses is set to
999, the control will enter Seamer Mode and continue to weld
- pulse until the pilot is removed. If Cool time is programmed
to 0, the seam will be continuous.
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