Arc Machines 227 - Manual (Page 27)

MODEL 227
OPERATION MANUAL
Doc # 740063 Rev E
SECTION IV - SYSTEM FUNCTIONS
4.0 INTRODUCTION
The M-227 is intended for use with AMI orbital welding heads and has functions
designed for these weld heads. This section describes what these functions are and
may, where needed for clarification, indicate how they are commonly (but not
always) used.
Step 4.1 is a general description; the remaining steps describe, in more detail, the
items of step 4.1. Only FUNCTION is discussed here. Details of function ranges and
tolerances can be found in section II of this manual and the AMI Specification No.
227. Details about operating these functions can be found in section V.
4.1 FUNCTIONAL DESCRIPTION, GENERAL
1. LIBRARY - The heart of the M-227 is its MEMORY. The values of each
function, for a given weld, are only programmed one time. After that the M-
227 will store the function values (for that weld) by WELD SCHEDULE
NUMBER (#) and description.
When a particular weld type is needed to be made the Operator can locate it
in the WELD SCHEDULE LIBRARY by description or by weld schedule
number (#).
2. WELD SEQUENCE AND LEVELS - Selected weld schedules are started
by manually initiating the SEQUENCE START. Once the sequence is
started the system operation can be totally automatic.
In addition to functions to start and stop the weld, the weld sequence
includes the ability to preset changes in function values and modes. These
changes are called LEVELS and as many as 100 levels can be used for each
weld sequence. All weld schedules start with (and must have) Level 1.
If preset changes are desired they will be set in LEVELS 2, 3, ETC. The
LEVELS advance from 1 to 2, 2 to 3, etc. automatically as a function of
time, or they can be advanced by the Operator manually.
3. CURRENT SOURCE AND CONTROL - The M-227 is a pulsed, 225
ampere peak, constant current, straight polarity, GTAW power source. The
current value(s) can be set between 3 and 225 Amps.
NOTE
The M-227 is limited, by software, not to be able to be programmed for an
average current (between primary and background) greater than 200 Amperes.
However, a peak pulse can be up to 225 amperes as long as the average does
not exceed 200 amperes.
4.1