AMI 415, Operation Manual, Page: 30 / 53

Model 415
Operation Manual
Document No. 740084
Revision N
25
1. Standard 6 function analog output connector for chart recorders (Amps, Travel,
Wirefeed, AVC, OSC, Arc Voltage at the power supply)
2. Post Sequence Print capability with Program values/over-ridden values and
actual peak/min/average values for that pass.
11. INPUT/OUTPUTS (I/O) - The M-415 will provides the following input and output signals.
1. External Sequence Start Input
2. External Sequence Stop input
3. External Emergency Stop Input
4. External Osc Steering Input
5. Remote Fixture Start output
6. Remote Fixture Desired Speed analog output
7. External Hot Wire PS Sequence Start Output
8. Desired Gas Flow Rate Output
12. SYSTEM and ARC HOURS - Electronically records the System ON time and Arc Hours.
4.7 WELD SEQUENCE
Although the M-415 can be used as a manual welding power source, it is primarily intended to
follow an automatic SEQUENCE. After a weld schedule is selected and the weld head is setup, the
SEQUENCE will be manually started by the operator and the following events will occur
automatically (see figure 5 for the timing chart):
1. EVENT 1: PREPURGE - Welding gas will start to flow (for the entire weld) from the gas
source (user supplied) through the power supply to the weld head. Complete gas coverage
must be obtained before the arc is initiated. The time it flows before the arc is struck is
called the PREPURGE TIME.
2. EVENT 2: ARC START - When PREPURGE time is complete the M-227 will initiate an arc.
The Arc Start MODE can be set to either RF or TOUCH. In RF mode a high frequency pulse
will be generated to establish an arc between the electrode and the weld joint. In TOUCH
mode the AVC will perform a TOUCH START and initiate the arc (can only be used with
Weld Heads with an AVC function).
3. EVENT 3: LEVEL 1 TIME, START LEVEL, UPSLOPE, TRAVEL and WIRE START DELAY,
AVC START DELAY and OSC UPSLOPE - When the arc is established the following
functions all start at the same time:
1. LEVEL 1 TIME - When the arc is established all weld functions are considered to be in
LEVEL 1. If the TIMER MODE is in AUTO the LEVEL 1 Timer will start to count and the
M-415 will stay in LEVEL 1 until this time is complete. If the TIMER MODE is set to
MANUAL or POSITION or EXT the system will still be in LEVEL 1 but the timer will not
be counting and the system will stay in LEVEL 1 until the operator manually advances
(MAN ADV) or the Weld Head reaches the programmed position or an external
command is received to advance to the next Level.
2. WELD CURRENT START LEVEL - As the arc is established the weld current will jump
to a small value. This is used to stabilize the arc and is called the START LEVEL. Its
value is programmable and may need to be changed depending on certain conditions.
However, it is not a multi-level function and it is only used to help initiate the arc.
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 (from the Start Level value) 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 functions at the rate set by the
Level 1 PULSE TIMES.