Arc Machines 227 - Manual (Page 29)

MODEL 227
OPERATION MANUAL
Doc # 740063 Rev E
SECTION IV - SYSTEM FUNCTIONS
4.1 FUNCTIONAL DESCRIPTION, GENERAL
10. FAULT STATUS - The system continuously monitors certain function such
as gas flow, coolant flow, ground fault, system temperature and input AC.
If there are any problems the system will alert the operator and in some
cases, where weld quality might be affected, the system will stop the
welding process.
11. GAS FUNCTIONS - As stated, the M-227 is intended for the GTAW
process. This process requires a welding gas (usually inert) for operation
and the M-227 is equipped with a gas solenoid and input/output connectors
for the control of the welding (arc) gas.
12. PRINT FUNCTIONS - Built into the M-227 is a Thermal Printer. The
printer allows copies of the Library and complete weld schedule to be made.
4.2
WELD LIBRARY AND WELD DESCRIPTION
Each weld schedule programmed into the system memory is identified and
displayed (when selected) with the following information:
1. # = Individual WELD SCHEDULE NUMBER from 001 to 100.
2. OD = Outside diameter in inches or mm of the weld.
3. WALL = Wall thickness in inches or mm of the weld.
4. MAT = Uses abbreviations to identify the base material the schedule is
programmed to run.
5. HEAD = Uses Weld Head Model number to identify what AMI Head the
schedule is programmed to run.
6. PASS = Indicates total number of weld passes programmed to complete the
weld.
4.3 WELD SEQUENCE - Although the M-227 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 should be obtained before the arc is
struck. How long it flows before the arc is struck is called the PREPURGE
TIME.
4.3