Castolin Eutectic CastoTIG 1401 DC, Руководство по эксплуатации

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15
General Safety Regulations
o
Before opening up any machine, always pull out
the mains plug first, or otherwise ensure that the
machine is "dead".
o
Components, assemblies or other units may only
be started up once they have been installed inside
a shockproof housing. They must be "dead" (i. e.
without current) while being installed.
o
Tools may only be used on units, components or
assemblies once it has been ensured that the
units are disconnected from the voltage supply
and that any electrical charges stored in
components inside the machine have been dis-
charged.
o
Live cables or leads connected to units, compo-
nents or assemblies must be checked regularly
for signs of insulation faults or breaks.
If any defect is found in the power supply lead,
the unit must be withdrawn from service imme-
diately, until the defective power lead has been
replaced.
o
Where new components and assemblies are
fitted, attention must constantly be drawn to the
importance of adhering strictly to the charac-
teristic data for electrical quantities given in the
accompanying descriptions.
If the descriptions provided for the non-industrial
final user do not make clear what electrical
characteristic values apply to a component,
advice must be sought from a qualified expert.
Electrical Safety Measures when Arc-welding
Hazards from electric current
Both mains and welding current can be hazardous. It is
forbidden by law for anyone but a qualified electrician to
do anything with any parts which are in contact with
mains voltage. The only exception to this applies, of
course, to the power plug and the mains switch. When
repair or maintenance work is being carried out on the
power source, the machine must first be completely dis-
connected from the mains. For all but the most minor
jobs on the machine in the course of which the operator
may have to leave the room, even if only briefly, the plug
socket(s) should be clearly blocked.
Important note for the TIG welder:
Inside the power source is the HF ignition unit, which
operates at extremely high voltages of several thousand
volts. The metal housing containing the ignition device
has a warning label on it which reads
“WARNING! HIGH VOLTAGE CAN KILL!”.
This housing may only be opened by a qualified
electrician - and only after the machine has been
unplugged from the mains! When welding is being carried
out with assisted ignition, the welding bench must be
earthed.
Protective earth conductor
Every power supply system will have a PE conductor.
This is a non-live, earthed conductor and connected with
the housing of the machine. If an earth fault occurs on
the machine there is an immediate short circuit between
the PE conductor and phase, causing the fuse on the
corresponding phase conductor to blow, and/or tripping
the fault-current breaker (FI).
Both the mains and the machine supply leads should be
regularly checked by a qualified electrician to ensure
that the PE conductor is functioning correctly.
Open circuit voltage
The highest - and thus the most dangerous - voltage in
the welding current circuit is the open-circuit voltage.
The maximum permissible open-circuit voltages are
stipulated in national and international regulations
according to the type of welding current, the design of
the current source and the extent of the specifically
electrical danger inherent to the workplace.
Rectifier power sources
A DC welding power source should be constructed in
such a way that if there is a fault in a rectifier (e.g. open
circuit, short circuit or phase fault), the permissible AC
values cannot be exceeded. Below, the open-circuit
voltage ratings to IEC 974 (1.1.90) for working under
normal conditions and for working under conditions of
increased electrical danger:
Working under normal conditions
For welding jobs done under normal conditions and using
simple equipment, the following open-circuit voltage
ratings apply:
o
for DC - peak value 113 V
o
for AC - peak value 113 V, effective value 80 V
These max. voltages may be exceeded on appliances
equipped with an RC circuit, so long as - with the arc
unlit - the higher voltage does not occur for longer than
0.2 seconds.
Exceptions may apply in the case of fully mechanised,
automatic or other special procedures. For welding
current sources capable of delivering either DC or AC,
the respective regulations apply to whichever operational
mode the machine is switched to.
Working under conditions of increased risk of
electrical hazard
Welding work in confined spaces, in cramped surroun-
dings, on or between electrically conductive parts, in
damp or hot spaces:
For welding jobs done under conditions of increased
electrical danger, the following open-circuit voltage
ratings apply:
o
for DC - peak value 113 V,
o
for AC - peak value 68 V, effective value 48 V.
An AC voltage occurring in the welding circuit may not
exceed 48V. This also applies to welding rectifiers being
used for welding purposes when the equipment is used
e.g. inside a boiler or tank etc. Welding rectifiers for use
inside boilers, tanks and the like must always be clearly
marked with the letter (safety).