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/8
NOTE: Turn main input power to the machine OFF before performing reconnect procedure. Failure to do so will result in damage to the machine. DO NOT switch the reconnect bar with machine power ON.
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 cir- cuit breakers smaller than recommended may result in “nuisance”
instructions located on the inside of the input access door or in Figure A.1. If the main reconnect switch is placed in the wrong position, the welder will not pro- duce output power. If the Auxiliary (“A”) lead is placed in the wrong position, there are two possible results. If the lead is placed in a position higher than the applied line voltage, the welder may not come on at all. If the Auxiliary (“A”) lead is placed in a position lower than the applied line voltage, the welder will not come on, and the two circuit breakers in the reconnect area will open. If this occurs, turn off the input volt- age, properly connect the “A” lead, reset the breakers, and try again.
INPUT VOLTAGE RECONNECT PROCEDURE
WARNING
Only a qualified electrician should connect the input leads to the Power Wave. Connections should be made in accordance with all local and national electri- cal 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.
Welders are shipped connected for the highest input voltage listed on the rating plate. To move this con- nection to a different input voltage, refer to reconnect
OUTPUT CONNECTIONS
Use the largest welding (electrode and ground) cables possible — at least 2/0, 4/0 preferred, copper wire — even if the average output current would not normally require it. When pulsing, the pulse current can exceeds 650 amps. Voltage drops can become excessive, leading to poor welding characteristics, if undersized welding cables are used.
To avoid interference problems with other equipment and to achieve the best possible operation, route all cables directly to the work or wire feeder. Avoid excessive lengths, bundle the electrode and ground cables together where practical, and do not coil excess cable.
POWER WAVE 455 STT