Cebora PLASMA SOUND PC 110/T Manual De Servicio página 104

CEBORA S.p.A.
6 TESTING AN IGBT MODULE
6.1 Check for shorted IGBT
Using a digital multimeter set in diode mode measurement:
1. Measure between C2/E1 and E2;
2. Measure between C2/E1 and C1;
If you measure a short ( 0 V ) in step 1a. or 1b., the IGBT is not usable.
6.2 Turn on Q1, Q2
Using a digital multimeter set in diode mode measurement:
1. Touch the + (red) meter lead to G1 and the - (black) to E1;
2. Touch the + (red) meter lead to G2 and the - (black) to E2;
3. Measure between C1 and C2/E1. Should read a low value (about a diode drop or
something more). Reverse meter leads, reading should be the same;
4. Measure between E2 and C2/E1. Should read a low value (about a diode drop or
something more). Reverse meter leads, reading should be the same.;
6.3 Turn off Q1, Q2
Using a digital multimeter set in diode mode measurement:
1. Touch the + (red) meter lead to E1 and the - (black) to G1;
2. Touch the + (red) meter lead to E2 and the - (black) to G2;
3. Measure value between C2/E1 (+) and C1 (-). Should read a low value (about a
diode drop or something more). Reverse meter leads. Read open circuit (OL);
4. Measure value between C2/E1 (-) and E2 (+). Should read a low value about a
diode drop or something more). Reverse meter leads. Read open circuit (OL);
Note: Some digital ohmmeters do not have enough power to turn on an IGBT. A
9 volt battery may be used instead. Connect the (+) terminal of battery to G1 and
the (-) terminal of battery to E1 and then the (+) terminal of battery to G2 and the (-
) terminal of battery to E2.
3302342
IGBT POWER MODULE(top view)
104
10/07/2019