IGBT TESTER
2
Field Service Bulletin
1
Red fail LED
When illuminated during test this indicates that the IGBT failed the test, for either an open IGBT when
switch is pressed to the right or a shorted IGBT when switch is pressed to the left.
Green pass LED
When illuminated during test this indicates that the IGBT passed the test, for either an open IGBT when
switch is pressed to the right or a shorted IGBT when switch is pressed to the left.
Red low battery LED
When illuminated during test this indicates that the remaining voltage in the battery is insufficient to
power the test circuitry. Replace battery immediately.
NOTE: The IGBT Tester requires a minimum of 8V to properly power its circuitry.
Indicator LEDs and device tests
Connect leads
Connect the colored leads to the IGBT as shown below.
Before the IGBT can be tested it must be electrically isolated from all circuits. If the IGBT is installed in a power
supply the power board and any lead connections must be removed before testing. Failure to do so may result in
false readings and/or damage to the IGBT tester.
CAUTION: Failure to ensure that IGBT is isolated may result in
false readings and/or damage to the IGBT Tester.
The IGBTs in Hypertherm power supplies may have one or two devices contained within the same housing. The
illustration below depicts two common configurations of an IGBT. Each connection on the IGBT will be labeled with
an abbreviation. They may be labeled as C, E, G or 1, 2, 3 with a schematic depicting numbers and pin functions.
Two Device IGBT
Gate 2 (G2)
Emitter 2 (E2)
Collector 2 (C2)
Gate 1 (G1)
Collector 1 (C1)
Emitter 1 (E1)
Device 2
Device 1
Single Device IGBT
Gate (G)
Emitter (E)
Collector (C)
Note: Each device should be tested seperately.
