• No metallic jewellery (rings, chains, etc.) or watches may be worn during welding.
• While welding is in progress, persons wearing heart pace-makers must keep at a safe distance from the
appliance and the welding cables, because the strong magnetic fields generated could endanger their lives.
• All normal accident prevention regulations must also be observed.
1.1.2 Operational Safety of the Equipment
• For the mains connection only a suitable mains plug of the right size or a fixed mains connection
may be used. Fixed mains connections (including fitting of the mains plug) may only be installed by a
trained electrician. Servicing and repairs on the opened power source may only be carried out by
sufficiently qualified personnel.
• The insulation of all cables must be in perfect condition. Cables with defective insulation must not be
used. Welding cables may carry high currents. Any points subject to bending, for example the cable entry
point at the handle of the welding gun, present a constant risk of the cable cross-section being gradually re-
duced by breakage of individual wires. When subjected to high pulsed currents, a cable thus weakened
may suddenly arc over and burn out. This causes a risk of burns to the operator and ignition of inflammable
ob-jects nearby.
• All parts of the housing must be kept firmly closed. Operation of the equipment with an open housing is
not permissible, because the operator is not protected against touching live parts while the housing is open.
• All insulating legs must be in perfect condition. If the legs are removed for fixed installation of the appli-
ance, alternative insulation between the housing of the appliance and the workpiece must be provided. If
galvanic currents flow between the housing and the workpiece during welding, this may, in case of a mal-
function, destroy the protective earth-line of the equipment.
• The interior of the appliance must be kept clean. Especially when working in dusty surroundings, dust
will collect on parts of the machine. Therefore, the housing should be opened at regular intervals (only after
first disconnecting the mains plug!) to blow out the dust (first call in an electrician to ascertain that the appli-
ance is not under voltage). In particular, it is vital to remove any metallic dust, since it can damage parts of
the appliance by short-circuiting. Do not aim a jet of air at PCB’s, but remove the dust from these with a
vacuum cleaner.
• Sufficient cooling. Cooling air is sucked in at the bottom of the appliance and blown out at the rear (ver-
sion with external ventilation). Provide adequate air circulation! Do not cover any ventilation openings!
• The welding gun must be in perfect condition. All connections in the welding circuit must be tight. There-
fore, make sure that the chuck is firmly attached by tightening the nut on the adapter screw, and that the
stud is firmly seated in the chuck. Otherwise, contact scorching may result. The bellows must always pro-
vide an impermeable shield against welding splashes and smoke.
• Electrical safety. Before opening the appliance, always pull out the mains plug to disconnect it from the
power supply, and make sure it cannot be switched on unintentionally! Keep in mind that, even after the
ap-pliance has been switched of, a dangerous level of residual voltage still persists in the capacitors for
several seconds. Therefore, before starting work on the interior of the power source, call in an electrician to
make sure that the capacitors are free of residual voltage.
Prevent moisture and foreign substances from entering the power source! If such substances have
entered, the appliance must be immediately disconnected from the power supply! The appliance should
also be in-spected by specialists at regular intervals and especially following any malfunction. Make sure
that all mark-ings remain clearly visible!
1.1.3 Workplace safety
• Do not operate the equipment in areas of fire or explosion danger! Remove all flammable objects from its
surroundings!
• Keep in mind that welding splashes are likely to ignite flammable objects, for example cleaning rags con-
Issue 4/2019 ver. 2.0 page 6 of 42
Köster & Co. GmbH • D-58256 Ennepetal • Spreeler Weg 32 • Tel. +49 2333 8306-0 • Fax +49 2333 8306-38
Internet: http://www.koeco.net • E-Mail: koeco@koeco.net
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