5、 Voltage-Divided Board
We must check the movement of Plasma arc voltage when we do the controlling of arc
voltage. The voltage of Plasma arc must be same as the voltage between electrode and earth. The
positive port of Plasma power output should be connected with earth, the negative end should be
connected with electrode inside the cutting torch. So the voltage on the electrode is electronegative.
The absolute value of the arc voltage when do the incision exceeds 100v, so we must divide the
voltage in order to control in the circuit.
5.1、 None Isolation Voltage-Divided
The simplest way to divide the voltage is none-Isolation voltage-divided that is resistance
divide the voltage directly. Use the Figure below to divide the voltage since the XPTHC-100
already has a 1:1 circuit of voltage-divided.
Figure2: none-Isolation voltage-divided circuit
Figure 2: none-Isolation voltage-divided circuit
Note: The arc voltage which goes into adjusting-height machine is
electronegative, if the electrode is contrary, the automatic high adjusting is
ineffective.
As the method of none-Isolation voltage-divided is linked with Plasma power( can
not do the Isolation for the HF when the arc is introduced), so the disturbance for
the high adjusting machine is maximal, but the cost is the minimal.
During the practice work, as the arc voltage after voltage-divided is delayed to go to the
controlling circuit, the influence is very limited.
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