Lincoln Electric SVM194-A B5.4, Throttle Body Deicing System, Idler Control Operation

CLASSIC® 300D & 300G

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B5.4		OPERATION		B5.4
CONTROL OF WELDING CURRENT			• When welding or drawing power for lights or tools
			(approximately 100-150 watts minimum) from the
	CAUTION		receptacles, the engine operates at high idle speed.
DO NOT TURN THE “CURRENT RANGE SELEC-			• When welding ceases or the power load is turned off,
TOR” WHILE WELDING because the current may			a preset time delay of about 10 seconds starts. This
arc between the contacts and damage the switch.			time delay cannot be adjusted.
------------------------------------------------------------------------			• If the welding or power load is not re-started before
The “Current Range Selector” provides five overlap-
ping current ranges. The “Fine Current Adjustment”			the end of the time delay the throttle body controller
adjusts the current from minimum to maximum within			reduces the engine to low idle speed.
each range. Open circuit voltage is also controlled by			AUXILIARY POWER
the “Fine Current Adjustment” permitting control of the
arc characteristics.			The AC auxiliary power, supplied as a standard, has a
A high open circuit voltage setting provides the soft			rating of 3.0 kVA of 115/230 VAC (60 hertz).
“buttering” arc with best resistance to pop-outs pre-			With the 3.0 kVA, 115/230 VAC auxiliary power, one
ferred for most welding. To get this characteristic, set
the “Current Range Selector” to the lowest setting that			115V duplex and one 230V duplex, grounding type
still provides the current you need and set the “Fine			receptacle are provided. The circuit is protected with
Current Adjustment” near maximum. For example: to			circuit breakers.
obtain 175 amps and a soft arc, set the “Current Range			The rating of 3.0 kVA permits a maximum continuous
Selector” to the 190-120 position and then adjust the
“Fine Current Adjustment” for 175 amps.			current of 13 amps to be drawn from the 230 volt
			duplex receptacle. Or a total of 26 amps can be drawn
When a forceful “digging” arc is required, usually for			from the 115 volt duplex receptacle. The 115 volt
vertical and overhead welding, use a higher “Current			duplex receptacle has a configuration which permits 20
Range Selector” setting and lower open circuit voltage.			amps to be drawn from either half. The total combined
For example: to obtain 175 amps and a forceful arc, set			load of all receptacles is not to exceed 3.0 kVA.
the “Current Range Selector” to the 240-160 position			An optional power plug kit is available. When this kit is
and the “Fine Current Adjustment” setting to get 175
amps.			specified, the customer is supplied with a plug for each
Some arc instability may be experienced with EXX10			receptacle.
			THROTTLE BODY DEICING SYSTEM
electrodes when trying to operate with long arc tech-
niques at settings at the lower end of the open circuit			The welder has been designed to allow continuous
voltage range.
			year-round operation. Engine coolant is channeled
	CAUTION		through the Throttle Bottle Injector (TBI) housing to
			prevent the build up of ice on the TBI throat around the
DO NOT attempt to set the “Current Range Selector”
			throttle plate. The electronic controller is programmed
between the five points designated on the nameplate.			to automatically compensate for the build up of ice on
------------------------------------------------------------------------			the throttle plate. There will be no noticeable change in
These switches have a spring loaded cam which			the operation of the welder should icing develop. On
almost eliminates the possibility of setting this switch			start-up, there is a possibility for the engine to over-
between the designated points.			speed ( to a maximum of 2000 RPM ) for up to 10 sec-
IDLER CONTROL OPERATION			onds after throttle body icing conditions have occurred.
			The electronic governor will correct itself for the new
The idle is controlled by the “Idler” toggle switch on the			operating conditions and normal operation will resume.
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 governor.

2. In the “Auto”	/	position, the engine oper-
ates as follows: