Lincoln Electric SA-250 manual General Description, Design Summary

The SA-250 is a heavy duty engine-driven DC arc welding power source capable of providing constant current output for stick welding or DC TIG welding. With the addition of the optional Wire Feed Module for K1283-4, the SA-250 will provide constant voltage output for running the LN-25, LN-23P or LN-7 wire feeders. The Wire Feed Module is factory-installed on the K1283-5 SA-250.

The SA-250 has a current range of 40-325 DC amps with a 60% duty cycle at 250 amps/40 volts. The units are also capable of providing 3 kVA of 115/230 volt, 60 Hertz AC auxiliary power.

3.0kVA of nominal 115/230V, 60 Hz, AC1. (See Optional Features for Power Plug Kits).

(1)Output voltage is within ± 10% at all loads up to rated capacity.

Welder Enclosures

The complete welder is rubber mounted on a rugged steel base.

The output terminals are placed at the side of the machine so that they are protected by the door. The output terminals are labeled (+) and (-).

DESIGN SUMMARY

Control Panel

Both the engine and the welder controls are located on one recessed panel at the auxiliary power alterna- tor end of the machine. The welder controls consist of

afive step “Current Range Selector” switch and a “Fine Current Adjustment” rheostat. Each welder is equipped with a “Start” button and an “Idler Control” switch. The Perkins diesel uses a “Thermostart” but- ton, and has a “Stop” control.

On this panel is also mounted an engine temperature gauge, a battery charging ammeter, an oil pressure gauge, and the three prong grounded type auxiliary power receptacle.

Copper Shunt Windings

For long life and dependable operation.

Remote Control

K924-1 (for K1283-4, -5) (Field Installed). Provides a receptacle switch and remote control box with 100 ft cord for fine current and OCV adjustment at the weld- ing site.

Cranking System

A 12 volt electric starter is standard.

Air Cleaner

Heavy duty two stage dry type.

Muffler

A muffler to reduce engine noise is standard on the diesel engine units.

The SA-250 is equipped with an electronic automatic engine idler. It automatically increases and decreases engine speed when starting and stopping welder or using auxiliary power. A built-in time delay permits changing electrodes before the engine slows to its low idle speed. The “Idler Control Switch” on the panel locks the idler in full speed position when desired.

A meter to record the hours of operation.

Diesel Engine Protection

The system shuts the engine down in the event of sudden low oil pressure or high coolant temperature.