%
$$&G% YORK, A Johnson Controls Company
IGBT Test Method
The following procedure will check the inverter transis-
tors (IGBTs) and diodes:
1. Disconnect input power to terminals (U
1
, V
1
, and
W
1
) and motor terminals (U
2,
V
2,
, and W
2
).
2. Disconnect any wires from terminals (UC+) and
(UC-) for regenerative braking.
3. Use a Digital Volt Meter (DVM) and set it for 1 ohm
resistance range. You can check the status of the
charging state of terminals (U
1
, V
1
, W
1
, U
2
, V
2
, W
2
,
UC+, and UC-) of the inverter and the probe of the
DVM by measuring the charging state.
Almost infinite ohms = “nonconducting,” and 0 to 10
ohms = “conducting.”
NOTE: The resistance values for the diodes or the
transistors will not be exactly the same, but
they will be close. If you find a significance
difference, a problem may exist.
CIRCUIT TYPE
+ -
MEASURED VALUE
DVM
PROBE
Inverter Component Values
OUTPUT
CONVERTER
SECTION
INPUT
CONVERTER
SECTION
D3
U
1
UC+ Conducting
UC+ U
1
Nonconducting
D2
V
1
UC+ Conducting
UC+ V
1
Nonconducting
D1
W
1
UC+ Conducting
UC+ W
1
Nonconducting
D6
U
1
UC- Nonconducting
UC- U
1
Conducting
D5
V
1
UC- Nonconducting
UC- V
1
Conducting
D4
W
1
UC- Nonconducting
UC- W
1
Conducting
TR3
U
2
UC+ Conducting
UC+ U
2
Nonconducting
TR2
V
2
UC+ Conducting
UC+ V
2
Nonconducting
TR1
W
2
UC+ Conducting
UC+ W
2
Nonconducting
TR6
U
2
UC- Nonconducting
UC- U
2
Conducting
TR5
V
2
UC- Nonconducting
UC- V
2
Conducting
TR4
W
2
UC- Nonconducting
UC- W
2
Conducting
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