Input Fuse And Supply Wire Considerations - Lincoln Electric Flextec 500X Operator's Manual

FLEXTEC ® 500X
WARNING
ELECTRIC SHOCK CAN KILL.
Only qualified personnel should perform this
installation.
• Turn off input power to the power source
at the disconnect switch or fuse box
before working on this equipment. Turn off the input
power to any other equipment connected to the welding
system at the disconnect switch or fuse box before
working on the equipment.
• Do not touch electrically hot parts.
• Always connect the flextec grounding lug (located
inside the reconnect input access door) to a proper
safety (earth) ground.
• Only a qualified electrician should connect the input
leads to the machine. Connections should be made in
accordance with all local and national electrical codes
and the connection diagram located underneath the
case top of the machine. Failure to do so may result in
bodily injury or death.
Figure B.1
INPUT AND GROUND CONNECTIONS
MACHINE GROUNDING
The frame of the welder must be grounded. A
ground terminal marked with the symbol shown is
located inside the reconnect/input connection area
for this purpose. See your local and national
electrical codes for proper grounding methods.

INPUT FUSE AND SUPPLY wIRE CONSIDERATIONS

Refer to Page A-1 for recommended fuse, wire sizes and type of
the copper wires. Fuse the input circuit with the recommended
super lag fuse or delay type breakers (also called "inverse time"
or "thermal/magnetic" circuit breakers). Choose input and
grounding wire size according to local or national electrical codes.
Using input wire sizes, fuses or circuit breakers smaller than
recommended may result in "nuisance" shut-offs from welder
inrush currents, even if the machine is not being used at high
currents.
Use a three-phase supply line. A 1.40 inch (36 mm)
diameter access hole for the input supply is located
on the case back. Remove the reconnect access
panel located on the case back and connect L1, L2,
L3 and ground according to the Input Supply
Connection Diagram decal. (See Figure B.1)
A-7
INSTALLATION
Power Supply Access Hole
• Route input power cable through
this hole.
• Strain relief required. See your
local and national electrical
codes for proper strain relief.
Reconnect Terminal Block
Reconnects auxiliary transformer for
the proper input voltages
Power Supply Terminal Block
• Line Cord/Cable attaches here.
• A ground terminal marked with
the symbol shown is
provided separate from this
block for connecting the ground
lead of the line cord. See your
local and national electrical
codes for proper grounding
methods.