Tweco 400 MST Arc Master User Manual

Page 35

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400MST

7

Voltage Reduction Device (VRD)

7 – 2

d. Turning the VRD ON/OFF (see Figure 7-3).

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 7-1.

To turn VRD OFF: rotate the trim potentiometer
(VR1) on the display PCB fully counter clock-
wise.

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.

Figure 7-3: VRD ON/OFF Step D

See also other documents in the category Tweco Equipment: