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Monitoring Welding Current
The welding current is measured via a separate current sensor (VAC or LSW pcb at older machine versions). The
current is monitored by the Microcontroller (Master) and the DSP (Process) at the same time.
Schematic
X2 / 3
X2 / 2
4
3
X2 / 1
2
1
current
sensor
The output of the current sensor is a current with a ratio of 1:2000, meaning at a welding current of 300A the sen-
sor output is 150mA. The output current is measured via an internal shunt resistor by the Master and Process.
If the Master measures a current >120% of the maximum value, the machine will stop and displays E03 (seconda-
ry overcurrent).
The measured values of the Master and Process must be always identical. If the Master is measuring a different
value as the Process (MAPRO internal measuring fault), the machine will stop and displays E09 (error v/a measu-
ring). If the Process is measuring a different value as the Master, the machine will stop and displays E21 (Output
voltage/current).
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MAPRO
DCDRV
+15V
X1 / 16
X1 / 15
X1 / 14
-15V
+3.3V
DSP
MASTER
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