Hypertherm Powermax65 Service Manual Rev.1 - Manual (Page 138)

TroubleshooTing and sysTem TesTs
5-12
powermax
65/85 Service Manual
Hypertherm IGBT tester
Use the Hypertherm IGBT (insulated gate bipolar transistor) tester (part number 128883) as described in the following
sections or assemble your own IGBT tester from the schematic diagram shown on page 5-15 Schematic for building an
IGBT tester and use it to test the IGBTs.
128884
Green “pass” LED
When illuminated, this LED indicates that the IGBT passed the test for an open IGBT when switch is
pressed to the right or for a short-circuited IGBT when switch is pressed to the left.
Red “fail” LED
When illuminated, this LED indicates that the IGBT failed the test for an open IGBT when switch is
pressed to the right or for a short-circuited IGBT when switch is pressed to the left.
Red “low battery” LED
When illuminated, this LED indicates that the remaining voltage in the battery is insufficient to power the
test circuitry. Replace the battery.
Note: The Hypertherm IGBT tester requires a minimum of 8 V to power its circuitry properly.
Indicator LEDs and device tests
Pass LED
(green)
Collector
(red)
Circuit
diagram
Fail LED
(red)
Test for
shorted IGBT
Low battery
LED (red)
Test for open
IGBT
Rocker
switch
Gate
(yellow)
Emitter
(black)