Arc Machines 227 - Manual (Page 11)

MODEL 227
OPERATION MANUAL
Doc # 740063 Rev E
SECTION I - INTRODUCTION
1.2
OPERATIONAL PRECAUTIONS
6. Before operating, insure that the M-227 has adequate air flow. Do not restrict
the intakes or exhaust vents of the power supply.
7. Before operating, always insure that there is bare metal contact between the
weld head components which connect to GROUND (clamp inserts, etc.) and
the tube or pipe to be welded.
8. When storing or handling weld heads, always keep them in the protective
containers they are shipped in, or optional carrying case, until ready to install.
9. When operating, storing or handling, insure that the system is protected against
dirt, dust, etc. NEVER GRIND NEAR AN EXPOSED WELD HEAD OR
THE M-227.
10. Do not use acid, corrosives, liquid “Easy Out” or any liquid substance on the
M- 227 or any AMI weld head. When cleaning, use only a light solution of
Isopropyl alcohol on a soft cloth .
11. When handling, take extreme care to avoid dropping the M-227, weld heads,
cables or any accessories.
12. Do not attempt to move tube end into position using the weld head as a lever.
13. Do not add any lubrication like graphite, oil or grease to the weld heads or
power supply unless it is specified in the operation or maintenance manual
for that equipment.
1.3
RF AND EMI EMISSIONS
1. WHY RF?
“It has long been recognized that in the practice of welding and cutting,
there are circumstances where it is required to assist the process using
radio frequency voltage. In order to arc weld an electric arc must be created,
because of safety and economic concerns, the no load voltage of arc power
sources is kept as low as practical. Thus, a source of high voltage with a
high safety factor must be utilized. Radio Frequency voltage is the best
method of meeting these criteria for many reasons.” (quoted from
CISPR/B/63).
1.5