Lincoln Electric SVM 122-A service manual Overload Protection, Auxiliary Power

B-9 B-9

OPERATION

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LN-7 AND LN-9 SEMIAUTOMATIC WIRE FEEDERS OR OTHER CONSTANT SPEED WIRE FEEDERS

To use the LN-7, LN-9, or other constant wire feed speed semiautomatic wire feeders with the Idealarc DC-400:

1.Set the Idealarc DC-400 welding MODE switch to either CV FCAW/GMAW mode or CV Submerged Arc mode, depending on the welding process being used.

NOTE: These semiautomatic wire feeders cannot be used in the CC mode.

2.Set the Idealarc DC-400 OUTPUT CONTROL switch.

a.LN-7: Use either an optional K775 Remote Control Box Assembly or set the Idealarc DC- 400 OUTPUT CONTROL switch in the “Local” position.

b.LN-9: Refer to the LN-9 Operator’s Manual for instructions on how to use the LN-9.

c.LN-25: Refer to the LN-25 Operator’s Manual for instructions on how to use the LN-25.

d.LN-742: Refer to the LN-742 Operator’s Manual for instructions on how to use the LN- 742.

OVERLOAD PROTECTION

The power source is thermostatically protected with proximity thermostats against overloads or insufficient cooling. One thermostat is located on the nose of the center bottom primary coil. A second thermostat is attached to the lead connecting the secondaries. If the machine is overloaded, the primary thermostat opens, the output becomes zero, and the amber thermal pro- tection light comes on. The fan will continue to run. The secondary thermostat opens with either an exces- sive overload or insufficient cooling. The output becomes zero, and the amber thermal protection light comes on. When the machine cools, the thermostats reset, and the thermal protection light goes off.

The power source is also protected against overloads on the SCR bridge asssembly through an electronic protection circuit. This circuit senses an overload on the power source and limits the output to 550 amps by phasing back the SCRs.

The Idealarc DC-400 also has self-restoring fusing to prevent damage to the machine in the event of an accidental grounding of the remote control leads (#75, #76 or #77).

AUXILIARY POWER

The Idealarc DC-400 can provide nominally 115 volt AC and 42 volt AC auxiliary power for operating wire feeding equipment and other accessories. This power is available at the 14-pin amphenol on the control panel and/or at the terminal strip behind the hinged control panel on the case front. On the amphenol, 115 volts AC is available at pins A and J (Domestic and Export models only); 42 volts AC is available at pins I and K. On the terminal strip, 115 volts AC is available at terminals 31 and 32; 42 volts AC is not available. The two circuits, 115 volts AC and 42 volts AC, are iso- lated; and each is protected by a 10 amp circuit break- er.

On European and export models, a Continental European receptacle is provided on the rear panel for supplying 220 volts AC to a water cooler. A 2 amp cir- cuit breaker, also located on the rear panel, protects this circuit from overloads or short circuits.

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IDEALARC DC-400

LINCOLN ®

ELECTRIC