A SERVICE OF

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6 Tachometer input
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Tachometer G01 is fitted in the motor casing. Tachometer output frequency is
796 Hz for a wire feed speed of 20 meters per minute.
Comparator IC4:2 converts the sine wave signal from the tachometer to a square
wave at the same frequency.
7 Burn--back time
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The burn--back time is the time from when motor braking starts until the main
contactor in the power unit opens. It can be adjusted between 0 and 0.5 seconds by
potentiometer R3, which is mounted on the circuit board.
8 Wire feed speed
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The wire feed speed range is from 1.9 to 20 meters per minute.
A 5 V reference voltage signal at connection A02 represents a speed of 20 m/minute.