The tests described below can be used to check the operation - 11 -. Unless specifically required by the procedure, never alter the board trimmers. If the IGBT's have burst the dissipators may have been irreversibly damaged: in this case they should be replaced; - apply thermo-conductive grease following the general instructions.
F Repeat this test on Q5 as well using the differential probe. G Set up the dual trace oscilloscope. The earth terminals are connected together to the emitter of Q1.
H Make sure the waveform displayed on the oscilloscope resembles fig. I Switch the power source on again and make sure that, following the brief start up time, the machine is not in alarm status the yellow alarm LED D12 is off, fig.
If the machine remains in alarm status and this is not due to a fault in the control there could be a fault in the photocoupler ISO1 fig. In this case the tests are the exactly the same as those for the Tecnica and can be carried out in the same way. The board is identified by a 6-digit code printed in white on the component side after the initials TW. This is the reference code for requesting a replacement: Telwin may supply boards that are compatible but with different codes.
Warning: before inserting a new board check it carefully for damage that may have occurred in transit. When we supply a. TECNICA - on the welding side cut away the protruding part of the rheofores and check they are not shorted between the gate and emitter in particular. D; - on the front panel turn the current potentiometer to minimum turn anti-clockwise as far as it will go ; - switch on at the main switch; - start up the ohmic load and make sure that: - the waveforms displayed on the oscilloscope resemble those in Fig.
B Please read the procedure for replacing the secondary board diodes carefully fig. During tests with the machine in operation never commute the selectors or activate the ohmic load contactor. Before proceeding to test the machine, we should remind you that during these tests the power source is powered and therefore the operator is exposed to the danger of electric shock. The tests given below are used to verify power source operation under load.
A Connect the power source to the static load generator using cables fitted with the appropriate dinse connectors code The earth terminals are connected together to the emitter, also of Q8. D Connect the power supply cable to the Vac power supply. During tests the operator must avoid contact with the metal parts of the torch because of the presence of dangerous, high voltage. B Intermediate load test: - set up the ohmic load with the switch settings as in the table in fig.
E; - on the front panel turn the current potentiometer to 75A approx. F; - on the front panel turn the current potentiometer to maximum turn clockwise as far as it will go ; - start up the ohmic load and make sure that: - the waveforms displayed on the oscilloscope resemble those in fig. E Running time test and closing the machine Under the load conditions shown in fig. F and with the current adjustment potentiometer R23 on maximum, switch on the power source and leave it in operation until the thermostatic capsules trigger machine in alarm.
After making sure the internal wiring is positioned correctly assemble the machine once and for all. F Welding test With the power source set up according to the instructions in the handbook make a test weld at 80A electrode diameter 2.
Check the dynamic behaviour of the power source. Scheduled tests for the TECNICA In this case the tests are the exactly the same as those for the Tecnica and can be carried out in the same way, with the exception of the rated load test point 1. A Rated load test - set up the ohmic load with the switch settings as in the table in fig. H; - on the front panel turn the current potentiometer to maximum turn clockwise as far as it will go ; - start up the ohmic load and make sure that: - the waveforms displayed on the oscilloscope resemble those in Fig.
D Checking the secondary diode voltages: - set up the dual trace oscilloscope, connecting probe CH1 x to the anode of diode D33 and probe CH2 x to the anode of diode D F; - on the front panel turn the current potentiometer to maximum turn clockwise as far as it will go ; - start up the ohmic load and make sure the waveforms displayed on the oscilloscope resemble those in fig. Per richiedere i pezzi di ricambio senza codice precisare: codice del modello; il numero di matricola; numero di riferimento del particolare sull'elenco ricambi.
Pour avoir les pieces detachees, dont manque la reference, il faudra preciser: modele, logo et tension de I'appareil; denomination de la piece; numero de matricule When requesting spare parts without any reference, pls specify: model-brand and voltage of machine; list reference number of the item; registration number Wenn Sie einen Ersatzteil, der ohne Artikel Nummer ist, benoetigen, bestimmen Sie bitte Folgendes: Modell-zeichen und Spannung des Geraetes; Teilliste Nuemmer; Registriernummer Por pedir una pieza de repuesto sin referencia precisar: modelo-marca e tension de la maquina; numero di riferimento de lista; numero di matricula.
Cavo Alim. Cable Alim. Mains Cable Netzkabel Cable Alim. In order to improve the service, each servicing centre is requested to fill in the technical card on the following page at the end of every repair job. Please fill in this sheet as accurately as possible and send it to Telwin.
Thank you in advance for your co-operation! Official servicing centers Repairing sheet Date: Inverter model: Serial number: Company: Technician: In which place has the inverter been used?
Building yard Workshop Others: Supply: Power supply From mains without extension From mains with extension m: Mechanichal stresses the machine has undergone to Description:. Pular no carrossel. Anterior no carrossel. Explorar E-books. Os mais vendidos Escolhas dos editores Todos os e-books. Explorar Audiolivros. Os mais vendidos Escolhas dos editores Todos os audiolivros. Explorar Revistas.
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Denunciar este documento. Fazer o download agora mesmo. Pesquisar no documento. The sale price is available on request. Building yard Workshop Others: Supply: Power supply From mains without extension From mains with extension m: Mechanichal stresses the machine has undergone to Description: Dirty grade Dirty inside the machine Description: Kind of failure Component ref. Augustoferreira Ferreira.
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OK Subscriptions powered by Strikingly. Alfa Romeo Service Manual. JavaScript is disabled Sorry, your browser does not support JavaScript! Support the project. General remarks 2 1. Dismantling 10 2. Assembling according to assembly groups 35 3.
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