1.2.4 Programmer
The programmer consists of a control board and a keyboard/display
board. The control board controls the power supply and the welder's
pneumatic functions; the keyboard/display board controls weld parameters
via the front panel displays and switches.
1.2.5 Linear Optical Encoder
The Linear Optical Encoder is a sensing device that tracks carriage
movement. The resolution of the encoder is 0.0001 in/0.0025 mm.
Note: The linear optical encoder reading wilIVary from the actual
distance the carriage travels by no more than
1
4 in/(6 mm),
due to the setting of the Upper Limit Switch (ULS). This
distance is consistent from cycle to cycle.
Information from the linear optical encoder is used as follows:
•
To determine the relative position of the carriage at any point
during the weld cycle.
•
To terminate the weld by
absolute distance
the total distance the
carriage travels from an upper limit position (ULS) to a preset lower
limit position.
•
To terminate the weld by
collapse distance —
the total distance the
carriage travels from the Dynamic Trigger Switch (TRS) to a preset
lower limit position.
900IW+
1-5
Introduction
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