Lincoln Electric SVM162-B service manual Pulse Frequency Control, Time Control PULSE% on

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B-8	OPERATION				B-8
• The 4-Step position allows welding without contin-		14. PULSE FREQUENCY CONTROL			– This knob is
uously holding the start switch trigger. The arc start		used to set the Pulse Frequency over the peak
switch functions in the following manner:		pulse range of about 0.1 pps to 20 pps. (One pulse
	1. Closing the switch starts preflow, then arc	cycle time = 1/pps = 10 to .05 sec. range.)
	starts at Minimum (Start) setting level (See	15. PULSE %		TIME CONTROL (PULSE% ON /
	Item 7). If the trigger is maintained closed	SPOT TIMECONTROL for codes above 11000) •
	after preflow time the output remains at the	• % ON TIME controls the duration of the peak cur-
	Start level until it is released.	rent as a percentage (5% to 95%) of one pulse
	2. Opening the switch initiates fixed (0.5 sec.)	cycle. The balance of the cycle time will be at the
		Background Current setting. (See Item 16)
	ramp time from Start setting level to Weld	• SPOT TIME sets the duration of the SPOT pulse
	setting.
	3. Reclosing the switch initiates Downslope	(0.5 to 5.0seconds on the red scale).
	ramp time setting (See item 17) from Weld	16. PULSE BACKGROUND CURRENT CONTROL –
	setting down to the Crater-fill level (See	This knob controls the level of the Background
	Item 7) of the machine.	Current as a percentage (MIN.-100%) of the Peak
	4. Reopening the switch after Downslope time	(REMOTE and/or LOCAL) output level (See Item
		6)	down to the Minimum Output setting (See Item
	holds Crater-fill level until it times out, then	7).
	stops the arc and initiates the Postflow Time	17. DOWNSLOPE TIME– This knob is used to set the
	(See Item 9). Reopening switch during
	Downslope time immediately stops the arc	time, over the range of zero to about 10 seconds,
Note:	and initiates the Postflow.	to ramp down from weld setting to Crater-fill level
	See Figure B.4 for 4-Step operation during	(See Item 7).
Downslope with Restart feature selected to be		• If the arc goes out after the Downslope time is initi-
enabled, instead of disabled (as shipped).		ated, the Downslope time is interrupted and the
		Postflow time is initiated. This prevents Hi-Freq re-
SWITCH for codes above 11000) – Turns on the		initiation during ramp down crater fill
		• When using an Amptrol remote control, where the
13.PULSE MODE SWITCH (PULSE / SPOT MODE		downslope is controlled by the operator down to the
Pulse Mode as indicated by the Green panel light
turning on.		crater-fill level, the Downslope time should be set to
• PULSE ON position provides a Peak current level		zero so as not to have the Downslope time delay
		when the arc start switch is opened.
set by REMOTE and/or LOCAL control of the output
current (See Item5), for a time determined by the
Pulse Frequency Control setting (See Item 14) and
the % ON Time (See Item 15). The balance of the
cycle time is at the Background Current level (See
Item 16).

• Pulsing begins after upslope when the output cur- rent rises above the Background Current level and ends when the output current drops below this level

• .SPOT ON position provides the peak current level set by the Maximum Output Control for a time deter- mined by the SPOT TIME control. A red panel light is ON to indicate SPOT mode.

PRECISION TIG 275