MAC TOOLS MW250 Owner's Manual - Emf Information
CYLINDERS can explode if damaged.
Shielding gas cylinders contain gas under high
pressure. If damaged, a cylinder can explode. Since
gas cylinders are normally part of the welding
process, be sure to treat them carefully.
1. Protect compressed gas cylinders from excessive heat,
mechanical shocks, and arcs.
2. Install and secure cylinders in an upright position by chaining
them to a stationary support or equipment cylinder rack to
prevent falling or tipping.
3. Keep cylinders away from any welding or other electrical circuits.
4. Never allow a welding electrode to touch any cylinder.
5. Use only correct shielding gas cylinders, regulators, hoses, and
fittings designed for the specific application; maintain them and
associated parts in good condition.
6. Turn face away from valve outlet when opening cylinder valve.
7. Keep protective cap in place over valve except when cylinder is
in use or connected for use.
8. Read and follow instructions on compressed gas cylinders,
associated equipment, and CGA publication P-1 listed in Safety
Standards.
PRINCIPAL SAFETY STANDARDS
Safety in Welding and Cutting, ANSI Standard Z49.1, from American Welding Society, 550 N.W. LeJeune Rd, Miami FL 33126
Safety and Health Standards, OSHA 29 CFR 1910, from Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402.
Recommended Safe Practices for the Preparation for Welding and Cutting of Containers That Have Held Hazardous Substances, American Welding
Society Standard AWS F4.1, from American Welding Society, 550 N.W. LeJeune Rd, Miami, FL 33126
National Electrical Code, NFPA Standard 70, from National Fire Protection Association, Batterymarch Park, Quincy, MA 02269.
Safe Handling of Compressed Gases in Cylinders, CGA Pamphlet P-1, from Compressed Gas Association, 1235 Jefferson Davis Highway, Suite 501,
Arlington, VA 22202.
Code for Safety in Welding and Cutting, CSA Standard W117.2, from Canadian Standards Association, Standards Sales, 178 Rexdale Boulevard,
Rexdale, Ontario, Canada M9W 1R3.
Safe Practices For Occupation And Educational Eye And Face Protection, ANSI Standard Z87.1, from American National Standards Institute, 1430
Broadway, New York, NY 10018.
Cutting And Welding Processes, NFPA Standard 51B, from National Fire Protection Association, Batterymarch Park, Quincy, MA 02269.
EMF INFORMATION
The following is a quotation from the General Conclusions Section of
the U.S. Congress, Office of Technology Assessment, Biological
Effects of Power Frequency Electric & Magnetic Fields −
Background Paper, OTA-BP-E-53 (Washington, DC: U.S.
Government Printing Office, May 1989): “. . . there is now a very large
volume of scientific findings based on experiments at the cellular
level and from studies with animals and people which clearly
establish that low frequency magnetic fields can interact with, and
produce changes in, biological systems. While most of this work is
of very high quality, the results are complex. Current scientific
understanding does not yet allow us to interpret the evidence in a
single coherent framework. Even more frustrating, it does not yet
allow us to draw definite conclusions about questions of possible risk
or to offer clear science-based advice on strategies to minimize or
avoid potential risks.”
To reduce magnetic fields in the workplace, use the following
procedures:
1. Keep cables close together by twisting or taping them.
2. Arrange cables to one side and away from the operator.
3. Do not coil or drape cables around the body.
4. Keep welding power source and cables as far away as practical.
5. Connect work clamp to workpiece as close to the weld as
possible.
About Pacemakers:
The above procedures are among those also normally
recommended for pacemaker wearers. Consult your doctor for
complete information.
Considerations About Welding And The Effects Of Low Frequency Electric And
Magnetic Fields
NOTE
mod10.1 4/93
TABLE OF CONTENTS
SECTION 1 − SAFETY INFORMATION
1
. . . . . . . . . . . . . . . .
SECTION 2 − SPECIFICATIONS
1
. . . . . . . . . . . . . . . . . . . . .
2-1. Volt-Ampere Curves
2
. . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2. Duty Cycle
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 3 − INSTALLATION
3
. . . . . . . . . . . . . . . . . . . . . . .
3-1. Installing Work Clamp
3
. . . . . . . . . . . . . . . . . . . . . . . . . .
3-2. Installing Gas Supply
4
. . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3. Gun Polarity Connections
5
. . . . . . . . . . . . . . . . . . . . . . .
3-4. Installing Welding Gun
6
. . . . . . . . . . . . . . . . . . . . . . . . .
3-5. Connecting Input Power
7
. . . . . . . . . . . . . . . . . . . . . . . .
3-6. Installing Wire Spool And Adjusting Hub Tension
9
. . .
3-7. Threading And Feeding Welding Wire
9
. . . . . . . . . . . .
SECTION 4 − OPERATION
11
. . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 5 − MAINTENANCE & TROUBLESHOOTING 13
5-1. Routine Maintenance
13
. . . . . . . . . . . . . . . . . . . . . . . . .
5-2. Overload Protection
14
. . . . . . . . . . . . . . . . . . . . . . . . . . .
5-3. Changing Drive Rolls And Wire Inlet Guide
5
. . . . . . . .
5-4. Aligning Drive Rolls And Wire Guide
15
. . . . . . . . . . . . .
5-5. Gun Maintenance
16
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-6. Troubleshooting
17
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 6 − ELECTRICAL DIAGRAM
17
. . . . . . . . . . . . . .
SECTION 7 − PARTS LIST
18
. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7-1. Main Assembly
18
. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7-2. Baffle w/Components
19
. . . . . . . . . . . . . . . . . . .
Figure 7-3. Wire Drive And Gears
20
. . . . . . . . . . . . . . . . . . .
Figure 7-4. MWG-23B
21
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .