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progress bar on the left side of the knob is adjusted proportionally with the value.
6.1.9 VRD Function Indicator
1) When the VRD function is disabled, the VRD indicator is not on.
2) When the VRD function is enabled and no welding is being performed and the VRD
indicator is green, it indicates that the VRD function is normal.
3) When the VRD function is enabled and no welding is being performed and the VRD
indicator is red, it indicates that the VRD function is abnormal.
4) When the VRD function is enabled, the VRD indicator is not on during welding.
6.1.10 Selection of MMA parameters
1) Press the key to select MMA parameters, and rotate the knob to adjust the
parameter value.
2) If the indicator is on, it indicates the MMA welding current.
3) If the indicator is on, it indicates the MMA hot start current.
4) If the indicator is on, it indicates the MMA arc-force current.
6.1.11 Selection of operation mode
1) Press the key to select the TIG operation mode.
2) If the indicator is on, it indicates that the machine is in 2T mode.
(In 2T mode, after pressing the torch trigger, the machine will start a high-frequency arc after
the pre-flow time, then reach the peak current from the initial current after the preset up-slope
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