Arc Machines 207 - Manual (Page 25)

MODEL 207A AND 207A-1
OPERATION MANUAL
Doc. No. 740044
Rev F
SECTION IV - SYSTEM FUNCTIONS
4.3 WELD SEQUENCE
3. EVENT 3: LEVEL 1 TIME, START LEVEL, UPSLOPE, TRAVEL.
START DELAY -
3. WELD CURRENT UPSLOPE - Sometimes it may be necessary to
raise the weld current to full value slowly. This is called UPSLOPE.
When the arc is established the weld current will start to rise to the
PRIMARY and BACKGROUND (if pulsed) value programmed in
LEVEL 1. The time it takes to rise to full value is the UPSLOPE
TIME.
4. PRIMARY and BACKGROUND PULSE TIMES - When the arc is
established and the LEVEL 1 PULSE MODE is programmed to the
ON position, the weld current will be pulsing between the PRIMARY
and BACKGROUND VALUES (it may be upsloping at first). The
amount of time it stays in the PRIMARY is set by the PRIMARY
PULSE TIME; it will be followed by the BACKGROUND PULSE
TIME, then the PRIMARY PULSE TIME and so on.
5. TRAVEL START DELAY - Rotation of the arc should not occur in
most cases until full penetration of the weld has been achieved. When
the arc is established the TRAVEL START DELAY time will begin to
count. When this programmable period of time is complete the weld
head will start to rotate the arc.
4. EVENT 4: FULL LEVEL FUNCTIONS - Sometime after the arc is
established, depending on the weld schedule, the UPSLOPE and TRAVEL
START DELAY will be completed and all of the following functions will
be in effect:
1. LEVEL 1 TIME - Will be counting towards 0. During its count all of
the below functions will be occurring:
2. LEVEL 1 PULSE MODE - Can be programmed to be ON or OFF. If
ON the system will pulse between PRIMARY and BACKGROUND
function values.
3. LEVEL 1 PRIMARY PULSE TIME - If the LEVEL 1 PULSE
MODE is ON this function will operate (see Event 3).
4.4