Nibe SPLIT AMS 10, Техническое руководство

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TROUBLESHOOTING THE POWER
TRANSISTOR
Checking the power transistor
Disconnect the connections to the compressor on the
inverter board PWB2 and measure between the connec-
tions in accordance with the table:
Normal values (Ω) Measurement points
AMS 10-12/-
16 AMS 10-8 Connection (-
) Connection
(+)
~ 1 MΩ 0 and the
value in-
creases N P
~ 300-400 kΩ P N
0 Several MΩ
and the value
rises U P
V P
W P
~ 1.2 MΩ ~ 650 kΩ U N
V N
W N
~ 1.3 MΩ ~ 670 kΩ P U
~ 4.4 MΩ P V
P W
0 ~ 650 kΩ N U
~ 4.8 MΩ N V
~ 4.9 MΩ N W
Location of measurement points
The power transistor’s connection P P
The power transistor’s connection N N
Red connection to compressor U
White connection to compressor V
Black or blue connection to compressor W
AMS10-12
U V W
P
N
AMS10-8
P
N
U V W
53 Chapter 6 | Troubleshooting NIBE AMS10