Arc Machines 207 - Manual (Page 22)

MODEL 207A AND 207A-1
OPERATION MANUAL
Doc. No. 740044
Rev F
SECTION IV - SYSTEM FUNCTIONS
4.0 INTRODUCTION
The M-207A 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 general description; the remaining steps describe, in more detail, the
items of steps 4.1. Only FUNCTION is discussed here. Details of function
ranges and tolerances can be found in section II of this manual and in AMI
Specification No. 207. Details about operating these functions can be found in
section V.
4.1
FUNCTIONAL DESCRIPTION, GENERAL
1. LIBRARY - The heart of the M-207A is its MEMORY. The values of each
function , for a given weld, are only programmed one time. After that the
M-207A 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 of functions is 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.
3. CURRENT SOURCE AND CONTROL - The M-207A is a pulsed, 150
ampere, constant current, straight polarity, GTAW power source. The
current value(s) can be set between 3 and 150 Amps
4.1