Tweco 300 ACDC Arcmaster - Manual (Page 55)

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Figure 11-3. VRD ON/OFF Step D
d) Turning the VRD ON/OFF. (see Figure 11-3)
• To turn VRD ON: rotate the trim potentiometer (VR1) on the display PCB fully clockwise.
When VRD is turned ON check that it operates as per VRD Specifications on page 48.
• To turn VRD OFF: rotate the trim potentiometer (VR1) on the display PCB fully
counter-clockwise.
WARNING
The VRD ON/OFF trim potentiometer MUST ONLY be positioned fully clockwise OR fully counter-
clockwise as the VRD function will be unknown for every other position.