Power Supply; Welding Preparations; Overheating Guard - Defort DWM-181 Instrucciones De Servicio

5. POWER SUPPLY

This welding set can be operated with a rated voltage of
230 V and 400 V. The desired rated voltage can be set by
means of the rotary switch illustrated in Figure 2-4. Please
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follow the operating instructions, as described below:
Figure 2:
The initial position of the rotary switch is set to 400 volts.
In the case of a closed circuit, the welding set is oper-
ated with a rated voltage of 400 volts. In order to reduce
the risk of sudden unforeseen voltage fl uctuations, please
secure the setting by fi xing a screw in the hole intended
for this purpose located below the rotary switch on the left.
Figure 4:
To operate the appliance with a rated voltage of 230 V,
please slacken and remove the screw located below the
rotary switch on the left and then turn the
switch to the desired position, which is labeled 230 V. After
this, please tighten the screw in the marked drill hole lo-
cated below the rotary switch on the right. Please observe
the following instructions in order to avoid the risk of fi re,
electric shock or personal injuries.
• Never use the appliance with a rated voltage of 400 V if
the appliance is set to 230 V. Caution: Fire risk!
• Please disconnect the appliance from the power supply
before setting the rated voltage.
• Adjusting the rated voltage during operation of the weld-
ing set is strictly prohibited.
• Before operating the welding set, please ensure that the
rated voltage selected on the appliance complies with that
of the power source.

6. WELDING PREPARATIONS

Important! Always make sure the device is unplugged be-
fore connecting or disconnecting the welding cable! Con-
nect the welding cables as shown in
nect the cable with the electrode holder
pole quick-lock coupling and the ground terminal
negative pole quick-lock coupling. Lock the connectors in
place by turning them in a clockwise direction.
Connect the earth terminal
ed or to the support on which the part is resting. Ensure
that the earth terminal is in direct contact with the part to
be welded. You should therefore avoid coated surfaces
and/or insulated materials. The electrode holder cable has
a special clamp at one end, which is used to secure the
electrode. The welding safety shield must be used at all
times for welding. It protects your eyes from the radiation
emitted by the arc and nevertheless enables you to watch
the welding process.
7. WELDING
After you have made all the electrical connections for the
power supply and for the welding circuit, you can proceed
as follows:
Insert the unsheathed end of the electrode into the elec-
trode holder and connect the earth terminal
part you wish to weld.
Ensure that a good electric contact is made. Switch on the
welding set at the switch
using the hand wheel
use. Hold the safety shield in front of your face and rub the
tip of the electrode on the part you wish to weld as if you
were striking a match. This is the best method of igniting
the arc. Check that you have the correct electrode and
current strength on a test part.
8
3 . To do so, con-
to the positive
to the
direct to the part to be weld-
to the
and set the welding current
to suit the electrode you wish to
Electrode (Ø mm)
2
2,5
3,2
4
Important!
Do not dab the workpiece with the electrode
since it could be damaged, making it more dif-
fi cult to ignite the arc.
As soon as the arc has ignited, attempt to keep it a dis-
tance from the workpiece equivalent to the diameter of the
electrode.
This distance should be kept as constant as possible
during the welding process. The angle of the electrode in
the direction in which you are working should be 20/30°.
Important!
Always use tongs to remove spent electrodes
and to
move parts that you have just welded. Please note that the
electrode holder must always be put down so that it is
insulated after you have completed the welding work.
Do not remove the slag until the weld has cooled. If you
want to continue a weld after an interruption, the slag from
your initial attempt must fi rst be removed.
Switch off and unplug the machine after operation.

8. OVERHEATING GUARD

The welding set is fi tted with an overheating guard that
protects the welding transformer from overheating. If the
overheating guard trips, the control lamp
will be lit. Allow the welding set to cool for a time.
9. MAINTENANCE
Switch off and unplug the machine before carrying out any
maintenance works on it. Remove dust and dirt from the
machine at regular intervals. Cleaning is best carried out
with a fi ne brush or a cloth.
Welding current (A)
40-80 A
60-110A
80-160 A
120-200 A
on your set