Lincoln Electric SVM156-A Electrode and Work Cable Connections, Negative Electrode Polarity

A-7 A-7

INSTALLATION

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When these parameters are identical, the pulsing fre- quency will be the same, helping to stabilize the arcs.

Every welding gun requires a separate shielding gas regulator for proper flow rate and shielding gas cover- age.

Do not attempt to supply shielding gas for two or more guns from only one regulator.

If an anti-spatter system is in use, each gun must have its own anti-spatter system. See Figure A.2.

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 or wire feeder. Avoid exces- sive lengths and do not coil excess cable. Do not tight- ly bundle the electrode and work cables together.

Use K1796 coaxial welding cables wherever possible.

Minimum work and electrode cables sizes are as follows:

TABLE A.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)

When using an inverter type power source like the Power Wave, use the largest welding (electrode and ground) cables that are practical. At least 2/0 copper wire - even if the average output current would not nor- mally require it.

CAUTION

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.

Most welding applications run with the electrode being positive (+). For those applications, connect one end of the electrode cable to the positive (+) output terminal 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 using the stud, lockwasher, and nut provided on the wire drive feed plate. The electrode cable lug must be against the feed plate. Be sure the connection to the feed plate makes tight metal-to-metal electrical contact. The electrode cable should be sized according to the specifications given in Table A.1. Connect a work lead from the negative (-) power source output terminal to the work piece. The work piece connection must be firm and secure, especially if pulse welding is planned.

CAUTION

Excessive voltage drops caused by poor work piece connections often result in unsatisfactory welding per- formance.

When welding with the STT process, use the positive output connection labeled (STT) for STT welding. (If desired, other welding modes can be used on this ter- minal; however, their average output current will be lim- ited to 325 amps.) For non-STT processes, use the positive output connection labeled (Power Wave), so that the full output range of the machine is available.

CAUTION

Do not connect the STT and Power Wave terminals together. Paralleling the terminals will bypass STT cir- cuitry and severely deteriorate STT welding perfor- mance.

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 (-) terminal, and work cable to the positive

(+) terminal).

When operating with electrode polarity negative, the Dip switch 7 must be set to ON on the Wire Feed Head PC Board. The default setting of the switch is OFF to represent positive electrode polarity.

To set the Negative Polarity switch on Wire Feed Head PC board, refer to the section DIP SWITCH

SETTINGS AND LOCATIONS.

POWER WAVE 455/R