Electrode Sense Polarity, AA-4 | Lincoln Electric SVM172-A manual

AA-4	INSTALLATION	AA-4

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OUTPUT CABLES, CONNECTIONS AND LIMITATIONS

Connect a work lead of sufficient size and length (Per Table AA.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 or wire feeder. Avoid exces- sive lengths and do not coil excess cable.

For additional Safety information regarding the elec- trode and work cable set-up, See the standard "SAFE- TY INFORMATION" located in the front of the Instruction Manuals.

CAUTION

Excessive voltage drops caused by poor work piece connections often result in unsatisfactory welding performance.

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Minimum work and electrode cables sizes are as follows:

TABLE AA.1

(Current (60% Duty Cycle) MINIMUM COPPER WORK CABLE SIZE AWG

	Up To-100 Ft. Length (30 m)
400 Amps	2/0 (67 mm2)
500 Amps	3/0 (85 mm2)
600 Amps	3/0 (85 mm2)

NOTE: K1796 coaxial welding cable is recommended to reduce the cable inductance in long distance Pulse applications up to 300 amps.

CAUTION

When using an inverter type power source like the PowerWaves, use the largest welding (electrode and work) 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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Output connections on some Power Waves are made via 1/2-13 threaded output studs located beneath the spring loaded output cover at the bottom of the case front.

Most welding applications run with the electrode being positive (+). For those applications, connect the elec- trode cable between the wire feeder and the positive

(+)output stud on the power source (located beneath the spring loaded output cover near the bottom of the case front). Connect the other end of the electrode cable to the wire drive feed plate. The electrode cable lug must be against the feed plate. Be sure the con- nection to the feed plate makes tight metal-to-metal electrical contact. The electrode cable should be sized according to the specifications given in the work cable connections section. Connect a work lead from the negative (-) power source output stud to the work piece. The work piece connection must be firm and secure, especially if pulse welding is planned.

NEGATIVE ELECTRODE POLARITY

When negative electrode polarity is required, such as in some Innershield applications, reverse the output connections at the power source (electrode cable to the negative (-) stud, and work cable to the positive

(+) stud).