Safety Precautions; Select Suitable Location; Input Power And Grounding Connection; Cable Connections - Lincoln Electric OPTIMARC AC/DC 350-TP Operator's Manual

A-2

SAFETY PRECAUTIONS

Read the entire installation section before starting
installation.
WARNING
ELECTRIC SHOCK can kill.

should perform this installation.

the main switch or fuse box before
working on this equipment. Turn
off the input power to any other equipment
connected to the welding system at the main
switch or fuse box before working on the
equipment.
 Do not touch electrically "Hot" parts.
 Always connect the OPTIMARC
(located at the rear of the case) to a proper safety
(Earth) ground. OPTIMARC
system with earthed neutral.

SELECT SUITABLE LOCATION

This power source should not be subjected to falling
water, nor should any parts of it be submerged in water.
Doing so may cause improper operation as well as pose
a safety hazard. The best practice is to keep the machine
in a dry, sheltered area.
CAUTION
The bottom of machine must always be placed on a
firm, secure, level surface. There is a danger of the
machine toppling over if this precaution is not taken.
Place the welder where clean cooling air can freely
circulate in through the back louvers and out through the
case or front sides. Water,dirt, dust or any foreign
material that can be drawn into the welder should be kept
to a minimum. Failure to observe these precautions can
result in excessive operating temperatures and nuisance
shutdowns.
®
Locate the OPTIMARC machine away from radio
controlled machinery. Normal operation of the welder
may adversely affect the operation of RF controlled
equipment, which may result in bodily injury or damage to
the equipment.
INPUT POWER AND GROUNDING
CONNECTION
WARNING
Only a qualified electrician should connect the input
®
leads to the OPTIMARC
made in accordance with the connection diagram.
Failure to do so may result in bodily injury or death.
Open the input box on the rear of the case. Use a three-
phase supply line, the three live wires should go through
the three holes of the input wire holder and be securely
clamped and fixed. Connect L1, L2, L3 and ground
according to the Input Supply Connection Diagram decal,
INSTALLATION
Only qualified personnel
Turn the input power OFF at
®
grounding lug
®
is for use on a 4 wire
. Connections should be
OPTIMARC
refer to Figure A.1 on this page.
Make sure the amount of power available from the input
connection is adequate for normal operation of the
machine. Refer to the Technical Specifications at the
beginning of this Installation section for recommended
fuse and wire sizes. Fuse the input circuit with the
recommended super lug fuse or delay type breakers.
Using fuses or circuit breakers smaller than
recommended may result in "nuisance" shut-offs from
welder inrush currents, even if the machine is not being
used at high currents.

CABLE CONNECTIONS

Connect electrode and work leads with sufficient size
between the proper output studs on the power source
and the electrode or the work. Be sure the connection to
the work makes tight metal to metal electrical contact.
Poor work lead connections can result in poor welding
performance.
To avoid interference problems with other equipment
and to achieve the best possible operation, route all
cables directly to the electrode and the work. Avoid
excessive lengths and do not coil excess cable.
Cable sizes are increased for greater lengths primarily for
the purpose of minimizing voltage drop in the cable.
Minimum work and electrode cable sizes are as follows:
Current (60% Duty Cycle)
200A
300A
400A
Note: The recommended cable size may need to change
depending on its quality. When the rated current flow
goes through, the total voltage drop on the ground cable
and electrode cable must not exceed 4 volts.
®
AC/DC 350-TP
FIGURE A.1
TABLE A.1
Minimum Copper
Work Cable Size
Up To 30m Length
30 mm
50 mm
70 mm
A-2
2
2
2
Rev. 05