ESAB Caddy Mig C200i Service Manual page 20

Voltage feedback is given on the CN4.1. Note that low voltage ground (GND_INV)
is connected via CN4.2 to the power supply (+). It enables creation of the summing
point in system with unipolar supply. Nevertheless the voltage feedback inverting
amplifier gives the signal in opposite phase. This signal is delivered to the next
inverting amplifier, which is not shown on the drawing. This amplifier also adds the
fraction proportional to the ramp signal, created during short circuit. In his way, a
current reference signal is delivered to the peak current mode PWM integrated
circuit IC11.
Edition 101222
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s1Cad200