Input Connection; Input Fuse And Supply Wire Considerations; Electrode And Work Cable Connections - Lincoln Electric Power Wave 455M/STT Operator's Manual

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INPUT CONNECTION

WARNING
Only a qualified electrician should
connect the input leads to the Power
Wave . Connections should be made
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in accordance with all local and
national electrical codes and the
connection diagram located on the inside of the
reconnect/input access door of the machine.
Failure to do so may result in bodily injury or
death.
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Use a three-phase supply line. A 1.75 inch (45 mm)
diameter access hole for the input supply is located
onthe upper left case back next to the input access
door. Connect L1, L2, L3 and ground according to the
Input Supply Connection Diagram decal located on the
inside of the input access door or refer to Figure A.1
below.
FIGURE A.1 - CONNECTION DIAGRAM ON
CONNECTION/INPUT ACCESS DOOR
INPUT SUPPLY CONNECTION DIAGRAM
WARNING
.
Disconnect input power before
inspecting or servicing machine.
.
Do not operate with covers
removed.
.
ELECTRIC
Do not touch electrically live parts.
SHOCK
Only qualified persons should install,
CAN KILL
use or service this equipment.
W / L3
V / L2
CR1
U / L1
INSTALLATION
INPUT FUSE AND SUPPLY WIRE
CONSIDERATIONS
Refer to the Technical Specifications at the beginning
of this Installation section for recommended fuse and
wire sizes. Fuse the input circuit with the
recommended super lag fuse or delay type breakers
(also called "inverse time" or "thermal/magnetic" circuit
breakers). Choose an input and grounding wire size
according to local or national electrical codes. Using
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.
ELECTRODE AND WORK CABLE
CONNECTIONS
Connect a work lead of sufficient size and length (Per
Table A.1) between the proper output terminal on the
power source and the work. Be sure the connection to
the work makes tight metal-to-metal electrical contact.
To avoid interference problems with other equipment
and to achieve the best possible operation, route all
cables directly to the work and wire feeder. Avoid
excessive lengths and do not coil excess cable.
Minimum work and electrode cables sizes are as follows:
Current
(60% Duty Cycle)
400 Amps
500 Amps
600 Amps
NOTE: K1796 coaxial welding cable is recommended
to reduce the cable inductance in long cable lengths.
This is especially important in Pulse and STT
cations.
When using inverter type power sources like the
Power Waves
and ground) cables that are practical. At least 2/0
copper wire - even if the average output current
would not normally require it. When pulsing, the
pulse current can reach very high levels. Voltage
drops can become excessive, leading to poor
welding characteristics, if undersized welding
cables are used.
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POWER WAVE 455M/STT
®
TABLE A.1
MINIMUM COPPER
WORK CABLE SIZE AWG
Up To-100 Ft. Length (30 m)
2/0 (67 mm2)
3/0 (85 mm2)
3/0 (85 mm2)
CAUTION
, use the largest welding (electrode
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appli-
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