Control card A004 functional testing (Mastertig 2800/3500)
5/1 24 Vac
5/2 Spark generator on/off
5/3 Start switch detection
X6/3 (A004) GND
Mastertig 2800/3500 control card A004 generates the ignition spark for TIG and it also reads
the torchswitch states. The torch switch is separated from other electronics on the
transformer, because the voltage inducted to the switch lines is almost full spark voltage
(approx. 10 kV).
The torch switch state is measured by the connector X5/3, according to these voltage limits:
After closing the torch switch the power stage will start and the output voltage will rise.
Power for the ignition spark is taken from the power source´s output voltage, from which a
spark of approx. 10 kV is developed. The spark generator is started via connector X5/2.
Torch switch open Torch switch closed
Ignition spark off Ignition spark on
Measured between connectors X5/1
and X5/2
Measured between X5/3 and ground
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