Lincoln Electric 10659 manual Control of Welding Current, Idler Control Operation, Auxiliary Power

B-3 OPERATION B-3

CONTROL OF WELDING CURRENT

CAUTION

DO NOT TURN THE “CURRENT RANGE SELEC- TOR” WHILE WELDING because the current may arc between the contacts and damage the switch.

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The “Current Range Selector” provides five overlap- ping current ranges. The “Fine Current Adjustment” adjusts the current from minimum to maximum within each range. Open circuit voltage is also controlled by the “Fine Current Adjustment” permitting control of the arc characteristics.

A high open circuit voltage setting provides the soft “buttering” arc with best resistance to pop-outs pre- ferred for most welding. To get this characteristic, set the “Current Range Selector” to the lowest setting that still provides the current you need and set the “Fine Current Adjustment” near maximum. For example: to obtain 175 amps and a soft arc, set the “Current Range Selector” to the 190-120 position and then adjust the “Fine Current Adjustment” for 175 amps.

When a forceful “digging” arc is required, usually for vertical and overhead welding, use a higher “Current Range Selector” setting and lower open circuit volt- age. For example: to obtain 175 amps and a forceful arc, set the “Current Range Selector” to the 240-160 position and the “Fine Current Adjustment” setting to get 175 amps.

Some arc instability may be experienced with EXX10 electrodes when trying to operate with long arc tech- niques at settings at the lower end of the open circuit voltage range.

CAUTION

DO NOT attempt to set the “Current Range Selector” between the five points designated on the nameplate.

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These switches have a spring loaded cam which almost eliminates the possibility of setting this switch between the designated points.

IDLER CONTROL OPERATION

The idle is controlled by the “Idler” toggle switch on the welder control panel. The switch has two positions as follows:

1. In the “High” position, and the engine goes to high idle speed. The speed is controlled by the gov- ernor.

2.In the “Auto” / position, the engine operates as follows:

•When welding or drawing power for lights or tools (approximately 100-150 watts minimum) from the receptacles, the engine operates at high idle speed.

•When welding ceases or the power load is turned off, a preset time delay of about 10 seconds starts. This time delay cannot be adjusted.

•If the welding or power load is not re-started before the end of the time delay the throttle body controller reduces the engine to low idle speed.

AUXILIARY POWER

The AC auxiliary power, supplied as a standard, has a rating of 3.0 kVA of 115/230 VAC (60 hertz).

With the 3.0 kVA, 115/230 VAC auxiliary power, one 115V duplex and one 230V duplex, grounding type receptacle are provided. The circuit is protected with circuit breakers.

The rating of 3.0 kVA permits a maximum continuous current of 13 amps to be drawn from the 230 volt duplex receptacle. Or a total of 26 amps can be drawn from the 115 volt duplex receptacle. The 115 volt duplex receptacle has a configuration which permits 20 amps to be drawn from either half. The total com- bined load of all receptacles is not to exceed 3.0 kVA.

An optional power plug kit is available. When this kit is specified, the customer is supplied with a plug for each receptacle.

THROTTLE BODY DEICING SYSTEM

The welder has been designed to allow continuous year-round operation. Engine coolant is channeled through the Throttle Bottle Injector (TBI) housing to prevent the build up of ice on the TBI throat around the throttle plate. The electronic controller is pro- grammed to automatically compensate for the build up of ice on the throttle plate. There will be no noticeable change in the operation of the welder should icing develop. On start-up, there is a possibility for the engine to overspeed ( to a maximum of 2000 RPM ) for up to 10 seconds after throttle body icing condi- tions have occurred.The electronic governor will cor- rect itself for the new operating conditions and normal operation will resume.

CLASSIC 300G