Kemppi Minarc 150 Service Manual

IGBT-transistor testing
G
C
E
I
G
B
T
-
T
E
S
T
E
R
T
R
1
T
R
2
C
O
N
T
R
O
L
O
F
F
O
N
B
2
/
6
C
2
E
1
/
1
E
2
/
2
C
1
/
3
B1/4
Discrete-IGBTs (50 A, 600 V) can be tested with an IGBT tester.
When changing damaged IGBTs, the whole series must be changed,
plus the gate resistors (10
Ω
)!!
Discrete-IGBT´s tightening torque to the heatsink is 0,6…1,2 Nm!
Secondary diode testing
When testing secondary diodes the other coil end of the main
transformer (T001) must be disconnected. Main transformer
cable connector´s may break if bent!
If secondary diodes are in short circuit, then the power source
will not start.
The tightening torque
for the
secondary diodes is
0,6…1,2 Nm!
The soldering must be done carefully, because they are stressed with
high current, approximately 30 A/ leg!
26

Kemppi Minarc 150 Specifications

General

Input Voltage	230 V
Protection Class	IP23S
Input Current	16 A
Welding Current Range	10 - 150 A
Weight	4.0 kg
Output Current	150 A
Electrode Size	1.5 - 3.25 mm
Power Supply	Single-phase
Welding Processes	MMA