DESCRIPTION OF OPERATION
0740 801 028
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© ESAB AB 2017
1AP1:5 Encoder monitoring
The panel has four rotary encoders for menu and value settings. Turning the encoder (1-3)
briefly connects contact 2 (0 V) to contacts 1 and 3, but with a slight time difference between
them. This generates pulses that are displaced by about 90° relative to each other.
One square wave pulse is used as clock frequency and the other square wave pulse defines
the knob-turning direction by comparing the phase position (positive or negative) compared
to the clock frequency.
Circuit diagram for encoder monitoring
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