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7. MAINTENANCE
WARNING! BEFORE CARRYING OUT MAINTENANCE
OPERATIONS MAKE SURE THE WELDING MACHINE IS SWITCHED OFF
AND DISCONNECTED FROM THE MAIN POWER SUPPLY.
EXTRAORDINARY MAINTENANCE
EXTRAORDINARY MAINTENANCE MUST ONLY BE CARRIED OUT BY
TECHNICIANS WHO ARE EXPERT OR QUALIFIED IN THE ELECTRIC-
MECHANICAL FIELD, AND IN FULL RESPECT OF THE IEC/EN 60974-4
TECHNICAL DIRECTIVE.
WARNING! BEFORE REMOVING THE WELDING MACHINE
PANELS AND WORKING INSIDE THE MACHINE MAKE SURE THE
WELDING MACHINE IS SWITCHED OFF AND DISCONNECTED FROM
THE MAIN POWER SUPPLY OUTLET.
If checks are made inside the welding machine while it is live, this
may cause serious electric shock due to direct contact with live parts
and/or injury due to direct contact with moving parts.
- Inspect the welding machine regularly, with a frequency depending
on use and the dustiness of the environment, and remove the dust
deposited on the transformer, reactance and rectier using a jet of dry
compressed air (max. 10bar).
- Do not direct the jet of compressed air on the electronic boards; these
can be cleaned with a very soft brush or suitable solvents.
- At the same time make sure the electrical connections are tight and
check the wiring for damage to the insulation.
- At the end of these operations re-assemble the panels of the welding
machine and screw the fastening screws right down.
- Never, ever carry out welding operations while the welding machine is
open.
- 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 high
voltage connections of the primary transformer separate from the low
voltage ones of the secondary transformer.
Use all the original washers and screws when closing the casing.
8. TROUBLESHOOTING
IN CASE OF UNSATISFACTORY FUNCTIONING, BEFORE SERVICING
MACHINE OR REQUESTING ASSISTANCE, CARRY OUT THE FOLLOWING
CHECK:
- Check that the welding current, which is regulated by the
potentiometer with a graduated amp scale, is correct for the diamter
and electrode type in use.
- Check that when general switch is ON the relative lamp is ON. If this is
not the case then the problem is located on the mains (cables, plugs,
outlets, fuses, etc.)
- Check that the yellow led (ie. thermal protection interruption- either
over or undervoltage or short circuit) is not lit.
- Check that the nominal intermittance ratio is correct. In case there is
a thermal protection interruption, wait for the machine to cool down,
check that the fan is working properly.
- Check the mains voltage: if the value is too high or too low the welding
machine will be stopped.
- Check that there is no short-circuit at the output of the machine: if this
is the case eliminate the incovenience.
- Check that all connections of the welding circuit are correct,
particularly that the work clamp is well attached to the workpiece, with
no interferring material or surface-coverings (ie. Paint).
- Protective gas must be of appropriate type (Argon 99.5%) and quantity.
(IT)
MANUALE ISTRUZIONE
ATTENZIONE! PRIMA DI UTILIZZARE LA SALDATRICE LEGGERE
ATTENTAMENTE IL MANUALE DI ISTRUZIONE.
1. SICUREZZA GENERALE PER LA SALDATURA AD ARCO
Loperatore deve essere sucientemente edotto sull’uso sicuro
della saldatrice ed informato sui rischi connessi ai procedimenti per
saldatura ad arco, alle relative misure di protezione ed alle procedure
di emergenza.
(Fare riferimento anche alla norma EN 60974-9: Apparecchiature
per saldatura ad arco. Parte 9: Installazione ed uso).
- Evitare i contatti diretti con il circuito di saldatura; la tensione
a vuoto fornita della saldatrice può essere pericolosa in talune
circostanze.
- La connessione dei cavi di saldatura, le operazioni di verica
e di riparazione devono essere eseguite a saldatrice spenta e
scollegata dalla rete di alimentazione.
- Spegnere la saldatrice e scollegarla dalla rete di alimentazione
prima di sostituire i particolari d’usura della torcia.
- Eseguire l’installazione elettrica secondo le previste norme e leggi
antinfortunistiche.
- La saldatrice deve essere collegata esclusivamente ad un sistema
di alimentazione con conduttore di neutro collegato a terra.
- Assicurarsi che la presa di alimentazione sia correttamente
collegata alla terra di protezione.
- Non utilizzare la saldatrice in ambienti umidi o bagnati o sotto la
pioggia.
- Non utilizzare cavi con isolamento deteriorato o con connessioni
allentate.
- Non saldare su contenitori, recipienti o tubazioni che contengano
o che abbiano contenuto prodotti inammabili liquidi o gassosi.
- Evitare di operare su materiali puliti con solventi clorurati o nelle
vicinanze di dette sostanze.
- Non saldare su recipienti in pressione.
- Allontanare dall’area di lavoro tutte le sostanze inammabili (es.
legno, carta, stracci, etc.).
- Assicurarsi un ricambio d’aria adeguato o di mezzi atti ad asportare
i fumi di saldatura nelle vicinanze dell’arco; è necessario un
approccio sistematico per la valutazione dei limiti all’esposizione
dei fumi di saldatura in funzione della loro composizione,
concentrazione e durata dell’esposizione stessa.
- Mantenere la bombola al riparo da fonti di calore, compreso
l’irraggiamento solare (se utilizzata).
- Adottare un adeguato isolamento elettrico rispetto l’elettrodo, il
pezzo in lavorazione ed eventuali parti metalliche messe a terra
poste nelle vicinanze (accessibili).
Ciò è normalmente ottenibile indossando guanti, calzature,
copricapo ed indumenti previsti allo scopo e mediante l’uso di
pedane o tappeti isolanti.
- Proteggere sempre gli occhi con gli appositi ltri conformi alla UNI
EN 169 o UNI EN 379 montati su maschere o caschi conformi alla
UNI EN 175.
Usare gli appositi indumenti ignifughi protettivi (conformi alla
UNI EN 11611) e guanti di saldatura (conformi alla UNI EN 12477)
evitando di esporre l’epidermide ai raggi ultravioletti ed infrarossi
prodotti dall’arco; la protezione deve essere estesa ad altre
persone nelle vicinanze dell’arco per mezzo di schermi o tende non
riettenti.
- Rumorosità: Se a causa di operazioni di saldatura particolarmente
intensive viene vericato un livello di esposizione quotidiana
personale (LEPd) uguale o maggiore a 85dB(A), è obbligatorio l’uso
di adeguati mezzi di protezione individuale (Tab. 1).
8


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