Lh20/1:5 Wireless Remote Current Control Receiver - ESAB LHF 405 PIPEWELD Service Manual

LH20/1:5 Wireless remote current control receiver
D4 and D5 ICs form 8 bit memory counter for transmitted value of welding current.
A8 and A9 ICs form D/A converter that converts binary current value to analog
within range of 0--10,7V. Comparator A6a forms detector of signal transmitted by
transmitter N02. Received signal is processed in pulse selector and separator what
serves for RESET and COUNT pulses identification. COUNT pulse duration is
proportional to welding current value. Gate D3a generates pulse that sets counters
D4 and D5 to zero.
D3b and D3c form flipper that controls pulse counting during current value
transmission. Comparator A6b forms circuit that blocks the receiver during welding.
Potentiometer R95 serves for control voltages calibration. For control voltage
calibration refer to paragraph 4 of "Testing and calibration procedure".
Edition 071024
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