Lincoln Electric IM557 manual Cold Feed

B-3 OPERATION B-3

			Timer/Crater Select - key enables
			operator to choose crater speed, spot
1	2		or gas timers as indicated by the appro-
			priate light. Pressing key causes lights
		CRATER to sequence (left to right, top to bottom)
		SPOT	starting from the current indicated posi-
			tion. Any parameter not available in the
			mode selected is skipped over. If a
			function is being displayed when the
			Timer/Crater Select key is pressed,
			then the light of the last parameter
			selected before the function was cho-
			sen will come on and become the start-
			ing point for the sequencing.
			Top Left Light - indicates preflow time
			is being displayed in seconds. This is
			the time the shielding gas flows before
			the wire feed and power source are
			activated.
			Top Right Light - indicates postflow
			time is being displayed in seconds.
			This is the time the shielding gas flows
			after the wire feed and power source
			are deactivated.
			Middle Light - indicates that crater feed
			speed is being displayed. Crater speed
			is only available when 4-step trigger
			with crater fill is selected. (See 4-step
			trigger mode selection section). It is
			activated by Step 3 and deactivated by
			Step 4 of the 4-step sequence.
			Bottom Light - indicates spot on time is
			being displayed in seconds.
			NOTE: if unit is not in spot mode then
			this light will be skipped over in the
			selection sequence.
			Increase Arrow - key increases the
			setting of the parameter selected to be
			displayed, except Wire Feed Speed and
			Volts/Trim which are controlled by the
			encoder knobs.
			Decrease Arrow - key decreases the
			setting of the parameter selected to be
			displayed, except Wire Feed Speed and
			Volts/Trim which are controlled by the
			encoder knobs.
			Arrow Keys use the “Accelerating
			Digit” method for setting changes,
			where holding the arrow key causes
			setting change rate to accelerate from
			slow to fast. Releasing arrow key resets
			to slow setting change.

GAS PURGE

V VOLTS/ TRIM

RUN-IN

WFS

GAS PURGE

12

CRATER

SPOT

GAS PURGE

COLD FEED

Acceleration Selection

Pressing both the “Gas Purge” key and then the func- tion select key at the same time causes the accelera- tion setting to be displayed. The display will indi- cate “A-X” where X will be a number from 1 through 5 with 5 being the fastest acceleration. This number can be adjusted using the arrow keys. To exit this function, press any other key except the arrow key, gas purge or function select key.

Burnback Time Selection

If necessary, for higher wire feed speeds, burnback time maybe selected to prevent the electrode from sticking in the weld puddle a the end of the weld. Pressing both the Gas Purge Key then the function select key at the same time, displaying acceleration setting per above, then pressing the function key a second time, while holding gas purge pressed, dis- plays the burnback time selection. Default is “b0" which is zero delay. Selecting “b1" through “b5" increases delay from 10 m sec to 50 m sec in 10 m sec increments. To exit this function press any other key except the arrow keys, gas purge or function select key.

Selection of English or Metric Speed Display Units

Pressing both the Gas Purge key and then timer select key at the same time causes the speed display units to toggle between IPM (no decimal point displayed) and m/m (a decimal point displayed). If the speed dis- play units were IPM, then they will change to m/m. If the speed display units were m/m, then they will change to IPM. If the display is showing the volts/trim or one of the timers when the keys are pressed, the display will be changed to weld speed to indicate the selected speed display units.

Run-In Selection

Pressing both the Gas Purge key then the Cold Feed key at the same time causes Run-In function to toggle on or off, as indicated by the Run-In indicator light turning on or remaining off in the function select sequence.

As shipped, the Run-In function is off with a fixed setting of 50 IPM (1.27 m/min.). Therefore, the Run-In indicator light will not sequence with the function select key, but the fixed setting will still be used for actual Run-In speed.

Activation of adjustable Run-In speed using the above dual key press will permit Run-In speed to be adjusted with the arrow keys, (See Section 3.3.4), and the Run-In indicator light will return to the function key sequence. Re- pressing the above dual key again removes the Run-In light from the function key sequence, but replaces the fixed Run-In speed with the adjusted Run-In speed setting, until readjusted.

SYNERGIC 7 & 7H