Troubleshooting guide ver 1.0
Contents technical data………………………………………. Operation principal………………………………….. Main circuit…………………………………………. Troubleshooting chart……………………….…...…. Main circuit diagrams………………………………. Functional tests/measurings…………...............……. Measuring points…………...……...….. Main transformer t001 prim. Voltage... M...
Minarc 140 minarc 110 supply voltage, 1~50/60 hz 220 v –10%…240 v +6% 220 v –10%…240 v +6% loadability 35%ed 140 a (7,5 kva) 50%ed 110 a (5,5 kva) 100%ed 100 a (5,1 kva) 80 a (3,9 kva) connection cable / fuses 2.5 mm² s / 3,3 m 16 a 1.5 mm² s / 2.0 m 13 a welding current range mma 10 a / 20.5 v…140 ...
Operating principal vdc t 105 13µs ma x. 0,5 n. + 320 v 1/3 v1 v2 when igbt-transistors v1 and v2 are not conductive, no power is transferred. The power is adjusted by changing the igbt-transistors conductive timings (pwm). Main circuit + t + t x3 x1 x2 r6 9 r7 0 l2 c2 8 c2 2 c5 l1 r59 r54 c4 3 v26 ...
General disturbance possible cause remedy power source not starting; ocv ~ 0 v; yellow overheat led h001 blinking. Fan m001 disconnect the fan connector x15 and start the power source. If the power source starts and the ocv rises, then replace the fan. Secondary choke l001 in short circuit with minu...
Main circuit diagrams main circuit diagram from serial number 1085088/m onwards (ocv approx. + 85 v) main circuit diagram, before serial number 1085088/m (ocv approx. + 105 v) 6.
Functional tests / measurings 1 2 3 measuring point 1. Main transformer t001 primary voltage measuring point 2. Main transformer t001 secondary voltage measuring point 3. Voltage after the secondary rectifier 7.
Measuring points on the control card a001 main tranformer t001 primary voltage, 10 a measuring point 1. Main tranformer t001 primary voltage 1 2 3 4 8.
Päämuuntajan t001 ensiöjännite, 140 a measuring point 2. Main transformer t001 secondary voltage main tranformer t001 secondary voltage, 10 a measuring point 1. Main transformer t001 primary voltage 9.
Main transfomer t001 secondary voltage, 140 a measuring point 3. Voltage after secondary rectifier voltage after the secondary rectifier, 10 a measuring point 2. Main transformer t001 secondary voltage 10
Measuring point 4. Igbt gate pulse igbt gate pulse, 10 a measuring point 3. Voltage after the secondary rectifier voltage after the secondary rectifier, 140 a 11.
Igbt gate pulse, 140 a igbt gate pulse, 60 a measuring point 4. Igbt gate pulse 12.
Igbt gate pulse with open circuit (ocv approx. + 105 v) measuring point 4. Igbt gate pulse igbt gate pulse with open circuit (ocv approx. + 85 v) 13.
Control card a001 connectors x15 x19 x3 x2 x1 x16 x18 x17 x004 x4 x5 x6 x7 x8 x24 x23 x10 x11 x14 x13 x12 x9 x20 connector signal x1, x2 net voltage 230 vac x3 protective earth x4, x6, x8 current adjustment potentiometer r001 x5, x7 mma/tig-selection switch s002 x9, x11 main transformer t001 auxilia...
Control card a001 layout x4 the older version control card a001, 4292730 the new control card a001, 4298870 15.
Control card a001 layout emi-filter intermediate circuit charging (rele 9766230) rectifier unit (9750191) sm oothi ng ca pa citors (9755615) igbts and opposite diodes (igbt-set 4297750) se conda ry re ctifi er unit (4297740) led (9775757) varistors ( 95 v 9753590, 175 v 9753588) 16.
Igbt-transistors testing g c e ig b t -t e s te r t r 1 t r 2 c o n t r o l o ff o n b2 /6 c2 e 1 /1 e 2 /2 c1/3 b1/4 discrete-igbt (50 a, 600 v) can be tested with the igbt-tester. When replacing damaged igbt-transistors the whole set must be always replaced. The gate resistors (10 Ω ) must be chec...
Service infos 02 / 2002 minus pole insulator power sources minarc 110 & 140 modification an insulator 9771963 is added to the minus-pole. See the attached picture. Reason for midification secondary choke may cause a short circuit between plus- and minus-poles. This is prevented by installing the ins...
Service infos 03 / 2002 igbt gate resistors and intermediate circuit charging relay power sources minarc 110 & 140 modification igbt gate resistors (10 ohm.) have been added to the spare part set (4297750). Reason for modification if the igbts are damaged, also the gate resistors (r2, r4, r5, r6, r7...
Service infos 20 / 2002 a new control cardi a001 and filter card z001 power sources minarc 110 and 140 modification control card a001 and filter card z001 have been replaced with new versions. The new spare part codes are as follows: power source control card a001 filter card z001 minarc 140 4298870...
Notes 21.
