Vrd (Voltage Reduction Device - Lincoln Electric 12881 Operator's Manual

DUAL MAVERICK ® 450 (AU)
SAFETY PRECAUTIONS
Only qualified personnel should install,
use, or service this equipment.
WARNING
Do not attempt to use this equipment until you have
thoroughly read the engine manufacturer's manual supplied
with your welder. It includes important safety precautions,
detailed engine starting, operating and maintenance
instructions, and parts lists.
ELECTRIC SHOCK can kill.
• Do not touch electrically live parts or
electrode with skin or wet clothing.
• Insulate yourself from work and ground
• Always wear dry insulating gloves.
ENGINE EXHAUST can kill.
• Use in open, well ventilated areas or vent
exhaust outside.
MOVING PARTS can injure.
• Do not operate with doors open or
guards off.
• Stop engine before servicing.
• Keep away from moving parts.
See additional warning information at front of this
operator's manual.

VRD (VOLTAGE REDUCTION DEVICE)

The VRD feature provides additional safety in the Stick, Wire, Pipe,
TIG, and Gouge modes especially in an environment with a higher
risk of electric shock such as wet areas and hot humid sweaty
conditions.
The VRD reduces the OCV (Open Circuit Voltage) at the welding
output terminals while not welding to less than 13V DC when the
resistance of the output circuit is above 200Ω (ohms).
The VRD requires that the welding cable connections be kept in
good electrical condition because poor connections will contribute
to poor starting. Having good electrical connections also limits the
possibility of other safety issues such as heat-generated damage,
burns and fires.
The machine is shipped with the VRD switch in the "OFF" position.
To turn it "ON" or "OFF":
1. Switch the High Idle/Run - Stop switch to the Stop position.
2. Remove the 8 screws on the upper panel (Fig A.1). Pull out
the panel to have access to the PC control boards (Fig A.1).
FIGURE A.1
3. Locate VRD switches (as marked in Fig A.2) on both PC
control boards. Left position on each switch indicates "OFF"
state; right position on each switch indicates "ON" state. PC
Control Board on the left is for settings for the left user. PC
Control board on the right is for settings for the right user.
FIGURE A.2
4. Set VRD switches as desired. Toggle left for "OFF". Toggle
right for "ON"
5. Reinstall the upper panel with screws from Step 2. Turn on
the High Idle/Run switch. Confirm VRD status on the LCD
screen display related to that PC board.
When the VRD switch is in the "ON" position, the display will show
a green tab with "VOLTS<30". If the VRD switch is in the "ON"
position and stud voltage is above 30 volts or while welding, the
display will show a red tab with "VOLTS>30".
A-2
INSTALLATION