Telwin DIGITAL MODULAR 230 Manual De Instrucciones página 7

- Select the thickness of the sheet to be spot-welded using the key (2 - FIG. C) on
the spot-welder control panel.
- Select the type of spot-welding (continuous or pulsed) using the key (3 - FIG. C).
When necessary it is possible to correct the default spot-welding time upwards or
downwards using key (1- FIG: C).
Regulate the spot-welding time using the potentiometer (9 - FIG.B1) on the back of the
spot-welder; using the lowest possible values compatible with correct execution of the
spot-weld (see 6.3 PROCEDURE).
To make a spot-weld, power the spot-welder then follow the instructions below:
- place the bottom electrode on the sheet to be spot-welded;
- pull the clamp lever to the end of its stroke, and hence until the microswitch is
pressed (8 - FIG.B) so that:
a) the sheets close between the electrodes with the preset force;
b) the welding current passes for the preset time.
- release the clamp lever shortly afterwards. This delay (holding) improves the
mechanical properties of the spot-weld.
welds using sheet of the same thickness and quality as that of the workpiece.
The spot-welding operation is deemed correct when a tensile test causes the spot-
welding core to come out of one of the two sheets.
that connects the welding circuit directly to earth.
If they are not, immediately interrupt welding and get a technician who is expert
conductor.
7. MAINTENANCE
7.1 ROUTINE MAINTENANCE
- electrode alignment check;
- spring load check (electrode strength);
- spot welder and clamp power cable integrity check
- electrode and arm replacement;
SUPPLIES.
If checks are carried out while the inside of the spot welder is live this could
due to direct contact with moving parts.
Periodically and as frequently as required by the use and environmental conditions,
inspect inside the spot welder and remove the dust and metal particles that have
deposited on the transformer, thyristor module, diode module, power terminal board,
etc. using a blast of dry compressed air (max. 5 bar).
necessary clean them with a very soft brush or suitable solvents.
At the same time:
- make sure the wiring does not show signs of insulation damage or loose - oxidised
connections.
- lubricate the joints and the pins.
- make sure the screws that connect the transformer secondary with the cast arm-
holders are tight and that there are no signs of oxidation or overheating; do the
same for the arm locking and electrode-holder screws.
- make sure the screws that connect the transformer secondary with the output bars
/ wires are tight and that there are no signs of oxidation or overheating.
- check machine earthing circuit continuity with the welding circuit (electrodes).
- make sure the transformer secondary screws (if present) are tight and that there
are no signs of oxidation or overheating.
- after having carried out maintenance or repairs, restore the connections and wiring
as they were before, making sure they do not come into contact with moving parts
or parts that can reach high temperatures. Tie all the wires as they were before,
being careful to keep the primary high voltage connections separate from the
secondary low voltage ones.
Use all the original washers and screws when re-closing the structural work.
- When the welding lever is activated the microswitch is effectively pressed, giving
the control board permission to weld.
- The heat protections have not cut in.
- The elements that are part of the secondary circuit (cast arm-holders – arms –
- The welding parameters (electrode strength and diameter, welding time) are
suitable for the work being carried out.
if
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