Ground voltage
320-VDC line
0-V line
0-V line voltage (point (F))
Voltage at point (E)
320V
+ 160V
- 160V
Terminal board
Ground
0-V line
Point (F)
Point (E)
Reactor
IPM
+
-
Compressor motor
2
AC230V
1
3
Outdoor unit circuits
M
Reason
The oscilloscope (chassis ground) has the same electric potential as the 0-V probe. The
entire electronic control section of the outdoor unit has a voltage potential difference from
the ground as shown in the above diagram. When the oscilloscope is set up, the 0-V line
and the ground voltage (ground) will be short-circuited, resulting in an excessive current
flow to cause damage to the oscilloscope or indoor electric circuits.
Do not touch the
cabinet or bring metal
parts into contact with
the cabinet.
Danger!!
Do not connect
the grounding
wire.
To Next Page
Loading...
Need help?
General
