Kemppi MinarcTig Evo 200 Service Manual

Service manual MinarcTig Evo 200
Version 1.1.5.
29.9.2015
18
Kemppi Oy
4.2.1.2. IGBT
Main supply voltage must not be connected during the IGBT module diode measuring.
IGBT module can be tested by multimeter if using the diode tester function. Module holds four diodes and
in many cases they may be defective if IGBT is damaged. They can be measured separately only if main
transformer primary is disconnected.
IGBT
Positive test lead
Negative test lead
Result
IGBT 1 diode + upper separate
diode; forward bias condition
IGBT1 emitter/IGBT 2
collector
DC-link positive
0,2-0,7VDC
IGBT 2 diode + lower separate di-
ode; reverse bias condition
IGBT1 emitter/IGBT 2
collector
GND
No value
IGBT 1 diode + upper separate
diode; reverse bias condition
DC-link positive
IGBT1 emitter/IGBT
2 collector
No value
IGBT 2 diode + lower separate di-
ode; forward bias condition
GND
IGBT1 emitter/IGBT
2 collector
0,2-0,7VDC
If the transformer primary is disconnected, IGBT 1 emitter and IGBT 2 collector connection points can be
used separately to measure diodes one by one. In this case the table must checked twice: first using the
IGBT 1 emitter point only and then the IGBT 2 collector point.
GND
IGBT1 emitter
IGBT2
collector
1
2
DC –link positive

Kemppi MinarcTig Evo 200 Specifications

General

Input Voltage	230 V
Protection Class	IP23
Power Factor	0.99
Welding Process	TIG, MMA
Duty Cycle TIG	35% at 200 A
Standards	IEC 60974-1, IEC 60974-10