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Summary of Contents for Unitor UWI-230TP
- Page 1 Ultima modifica/Last Update: 08/10/2015 Rev1.0 UWI-230TP ACDC Reparation Manual UWI-230TP AC/DC...
- Page 3 CAUTION! Before carrying out any work on the machine make sure it is off and the plug has been disconnected. PROBLEM CASE SOLUTION The machine does not Lack of power supply Make sure the line switch is closed, the protection devices (fuses) are not enabled switch on.
- Page 4 PROBLEM CASE SOLUTION The front panel does The fan works but the front panel Switch off the machine and disconnect the plug. does not go on. Make sure the flat cable that connects the not switch on. front panel to the power board is inserted correctly.
- Page 5 PROBLEM CASE SOLUTION Yellow led on. Yellow led onThermal protection Leave the machine on for few minutes to allow device keeps onUsing a the cooling of the inverter. Switch the Output voltage in each continuity tester verify machine off and disconnect the plug. procedure is about if::Protectors are openProtectors Remove the hood and make sure:the...
- Page 6 PROBLEM CASE SOLUTION Poor welding quality Spattering occurs during MMA Make sure welding polarity is correct, the earth welding. clamp is fixed correctly and check the hot- start and arc-force values that have to be decreased if they are too high. The arc switches off while welding The inversion board 0071 or the front panel 0015 must be replaced.
- Page 7 EXPLANATION The varistor is a blue disc. This device is for protecting the board from input overvoltage. When there is overvoltage they “explode” causing a short circuit most of the times. If the extent of the short circuit is very high, they become an open circuit.
- Page 8 EXPLANATION Check the power supply cable and the mains switch. You have to disconnect the machine to the main power supply and switch on the main switch (position “I”). Now you have to check the continuity, with a diode tester, between points D1-F1 and D2—F2. If there is no continuity, you have to check the single parts If you see L1 ON, the OVERCAT is working.
- Page 9 EXPLANATION Input bridge rectifier. To check the Input bridge rectifier , carry out the following measurements with a diode tester: Rheofore Probe Rheofore Probe Rosso D1-D2 Nero Rosso D1-D2 Nero Nero D1-D2 Rosso Nero D1-D2 Rosso Should there be a short circuit on one of these measurements, the input bridge rectifier must be replaced.
- Page 10 EXPLANATION Make sure the two terminals of the thermal devices are well inserted in the 8-pin white connector on the power board 0070. Make sure that the fan cables +24 V are correctly inserted: 2-pin connector on the power board; 2-pin connector on the fan.
- Page 11 EXPLANATION You have to check the Vout cable. Red Probe Black Probe Measure Pin 4 Negative “OL” of the amphenol Socket Pin 8 Positive “OL” of the amphenol shocket Make sure that the output filter board 0074 cables are correctly inserted in the front panel connectors (board 0015).
- Page 12 EXPLANATION To check diodes remove the snubber board and carry out the following measures with a diode tester: Copper bar Probe Copper bar Probe Measure UP/DOWN black black UP/DOWN “OL” UP/DOWN black “OL” black UP/DOWN At the ends of the two transils (see below) positioned on the snubber board, “OL”...
- Page 13 EXPLANATION Press S1 and S3 while switching on the machine until appears MEMORY RESETTING. Check continuity, with a diode tester, between points the power board and B-X poles of the connector that goes to the front panel. Connect the MINIFIT 4 PINS at the power board, switch on the machine and check between Y-X if there is +24Vdc.
- Page 14 EXPLANATION Checking the remote cable. With a tester (diode mode) check the data table follow. Probe red Probe black Misura “OL” “OL” “OL” Check if the flat cable has a good connection in the power board.
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