Lincoln Electric IM924 Input Connection, Input Fuse and Supply Wire Considerations, Table A.1

A-3	INSTALLATION	A-3
	FIGURE A.1 - CONNECTION DIAGRAM ON CONNECTION/INPUT ACCESS DOOR

INPUT SUPPLY CONNECTION DIAGRAM

.

.

.

.

Disconnect input power before inspecting or servicing machine.

Do not operate with covers removed.

Do not touch electrically live parts.

Only qualified persons should install, use or service this equipment.

W / L3
V / L2	CR1
U / L1

THE LINCOLN ELECTRIC CO. CLEVELAND, OHIO U.S.A.

XA

S24190

NOTE: Turn main input power to the machine OFF before performing connection procedure. Failure to do so will result in damage to the machine.

INPUT CONNECTION

WARNING

Only a qualified electrician should connect the input leads to the Power Wave 455M/STT (CE). Connections should be made in accordance with all local and national electrical codes and the con- nection 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.

-------------------------------------------------------------

Use a three-phase supply line. A 45 mm (1.75 inch) diameter access hole for the input supply is located on the 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.

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 recommend- ed 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 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:

TABLE A.1

Current (60% Duty Cycle) MINIMUM COPPER

WORK CABLE SIZE AWG

Up To-30 m Length (100 Ft.)

400 Amps	67 mm2 (2/0)
500 Amps	85 mm2 (3/0)
600 Amps	85 mm2 (3/0)

NOTE: K1796 coaxial welding cable is recommended to reduce the cable inductance in long cable lengths. This is especially important in Pulse and STT applications.

CAUTION

When using inverter type power sources like the Power Waves, use the largest welding (electrode and ground) cables that are practical. At least 67 mm2 (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.

------------------------------------------------------------------------

POWER WAVE 455M/STT (CE)