Kemppi FASTMIG X 450 Service Manual page 31

IGBT MODULE TEST:
Kemppi IGBT-tester is simple way to be sure that module is working. Tester simulates DC link voltage and
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gate pulses and measures output voltage. Tester can trigger two IGBTs at the same time (one for positive
and one for negative) so it have to be connected two different ways to test the whole IGBT module. Tester
takes it power from two 9V battery. This makes possible to have "DC link" voltage as high as 18VDC which
makes measuring more reliable.
Kemppi IGBT tester buttons and connectors:
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o ON/OFF switch Switches tester ON and OFF
o TR1 and TR2: Trigger buttons for gate controls LEDS: Shows if output has a voltage
o C1/3: Emulates DC link positive voltage
o E2/2: Emulates DC link negative voltage
o B1/4: TR1 gate control signal/positive
o B2/6: TR2 gate control signal/negative
o C2E1/1: Pos. / Neg. output voltage measuring
Measurings:
IGBTs 1 and 2:
Disconnect gate driver card A001 X3 and X4 connectors
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Connect C1/3 to Z002 X1 (DC link positive)
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Connect E2/2 to Z002 X3 (DC link negative)
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Connect B1/4 to X4-4 (IGBT 1 gate control, positive)
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Connect B2/6 to X4-6 (IGBT 2 gate control, negative)
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Connect C2E1/1 to X4-1 (point between IGBT 1 and 2)
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IGBTs 3 and 4:
Keep C1/3 and E2/2 connected as above
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Connect B1/4 to X3-6 (IGBT 3 gate control, positive)
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Connect B1/4 to X3-6 (IGBT 3 gate control, positive
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Connect B2/6 to X3-4 (IGBT 4 gate control, negative)
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Connect C2E1/1 to X4-1 (point between IGBT 3 and 4)
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Only when triggering by buttons TR1 and TR2 LEDs should illuminate. If LEDs don't light or are lit without triggering, the IGBT
module may be faulty.
Kemppi OY
SERVICE MANUAL
FASTMIG X
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