powermax1250 Service Manual 3-1
Section 3
MAINTENANCE
In this section
Controls and indicators .............................................................................................................................................3-3
Indicator LEDs..................................................................................................................................................3-3
Theory of operation...................................................................................................................................................3-4
General ............................................................................................................................................................3-4
Functional description ......................................................................................................................................3-4
Sequence of operation.....................................................................................................................................3-5
Troubleshooting preparation .....................................................................................................................................3-6
Test equipment.................................................................................................................................................3-6
Troubleshooting procedures and sequence .....................................................................................................3-6
External inspection...........................................................................................................................................3-6
Internal inspection ............................................................................................................................................3-7
Initial resistance check..............................................................................................................................................3-7
Check the power switch ...................................................................................................................................3-8
Hypertherm IGBT tester ...................................................................................................................................3-9
Indicator LEDS and device tests......................................................................................................................3-9
IGBT test preparation.....................................................................................................................................3-10
IGBT device test using the Hypertherm tester ...............................................................................................3-10
T
roubleshoot the Hypertherm IGBT
tester .....................................................................................................3-11
Schematic for building an IGBT tester............................................................................................................3-11
IGBT device test using a non-Hypertherm tester ...........................................................................................3-12
T
roubleshooting guide ............................................................................................................................................3-14
Control board LEDs........................................................................................................................................3-20
Test 1 – voltage input .....................................................................................................................................3-22
T
est 2 – voltage balance ................................................................................................................................3-23
Test 3 – output diodes....................................................................................................................................3-24
Test 4 – pilot arc IGBT (Q8) ...........................................................................................................................3-25
T
est 5 – inverter IGBT (Q6) and PFC IGBT (Q7) ...........................................................................................3-26
Test 6 – flyback circuit....................................................................................................................................3-27
Test 7 – torch stuck open (TSO) ....................................................................................................................3-28
T
est 8 – plasma start ......................................................................................................................................3-29
Test 9 – torch cap sensor...............................................................................................................................3-29
Test 10 – gas solenoid ...................................................................................................................................3-30
T
est 11 – incoming line voltage (VACR) .........................................................................................................3-30
Test 12 – pressure switch...............................................................................................................................3-30
Test 13 – fan...................................................................................................................................................3-30
To Next Page
Loading...
Need help?
General
