Description: Synchronous Digital Controller WD-202 is a compact, user-friendly, low cost controller with in-built power module for up to 415 V, 90 A AC spot welding machine. It allows easy reading of thumbwheel switches for setting number of welding cycles. It is provided with an input supply of 230/415 V AC, 50/60 Hz; output of built-in back-to-back thyristors drive transformers up to 90A primary current. The welding time of 0-99 cycles (half cycles of input supply frequency); weld energy of 0-100% adjustable by potentiometer (corresponding to firing angle of 170? to 30?). The triggers are external, normally open contact, actuates at contact closure and trigger delay amount to 0.1-3.0 sec (adjustable by potentiometer). The dimension of the machine in term of width, height and depth is 100 X 192 X 300mm.
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