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1sxx02cw
CB0:5 Current sensor
The current signal supplied to contact S3 on circuit board CB0 is 200 mA at 400 A,
and is linearly proportional to the welding current. Measuring the voltage between
contacts S3 and S4 on circuit board CB0 must show 0.195 V at 100 A of welding
current. (U = R x I --> 3.91 x 0.05 = 0.195)
If circuit boards CB01 or CS are replaced, the machine must be recalibrated.
Offset potentiometer R201 is not mounted on circuit board CB0. The offset
adjustment is carried out by fixed resistors.
At no load, there must be a voltage of 0 V ±2 mV at input S3 of circuit board CB0.
If the current sensor gives an incorrect value on no load, it must be replaced.
The sensor must be connected to CB0 when making the measurement.
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