Hitachi RAM-53NP3A RAM53NP3A User Manual
Product codes
RAM53NP3A
14-4
14.1.3 MULTIZONE/MONO SPLIT RAM-53NP2A / 53NP3A / 68NP3A / 70NP4A , MONO SPLIT RAF-50PXA/RAC-
50FXA
Warning
Remember that voltage of 162V is applied to the 0V line on the
P.W.B. or the like as shown in the diagram below
P.W.B. or the like as shown in the diagram below
Warning
When using an oscilloscope, never ground it. Don’t forget that
high voltage as noted in the left figure may apply to the
oscilloscope.
high voltage as noted in the left figure may apply to the
oscilloscope.
14.1.4 MULTIZONE RAM-90NP5A
Warning
Remember that the 0V line is biased at 162V in reference to
the ground level. Also note that it takes about 10 minutes until
the voltage fall after the power switch is turned OFF.
the ground level. Also note that it takes about 10 minutes until
the voltage fall after the power switch is turned OFF.
Warning
When using an oscilloscope, never ground it. Don’t forget that
high voltage as noted in the left figure may apply to the
oscilloscope.
high voltage as noted in the left figure may apply to the
oscilloscope.
Power source
Smoothing Capacitor
Control
P.W.B
P.W.B
MAIN
P.W.B
P.W.B
N
L
D
C DC35V
0V
Compressor
IPM
A
C
T M
odul
e
ⓐ
ⓑ
0V
Across ⓐ–ⓑ (0V line) approx 260~360V
Across ⓐ–ground approx 155~170V
Across ⓑ (0V line)-ground approx 155~170V
Across ⓐ–ground approx 155~170V
Across ⓑ (0V line)-ground approx 155~170V
Outdoor unit P.W.B.
Always keep your
hands and metallic
things away from the
enclosure of the
oscilloscope
hands and metallic
things away from the
enclosure of the
oscilloscope
DANGER!
Don’t install
the ground
line
Don’t install
the ground
line
Power source
System power module
MAIN P.W.B.
Control
P.W.B.
Indoor
L
N
Compressor
motor
C
D
DC35V
0V
0V
P
o
w
e
r mo
d
u
le
ACT
mod
ul
e
ⓑ
ⓐ
Across ⓐ-ⓑ (0V line) approx 360V
Across ⓐ–ground approx 155~170V
Across ⓑ (0V line)-ground approx 155~170V
Across ⓐ–ground approx 155~170V
Across ⓑ (0V line)-ground approx 155~170V
Outdoor unit
P.W.B.
P.W.B.
Always keep your
hands and metallic
things away from
the enclosure of the
oscilloscope
hands and metallic
things away from
the enclosure of the
oscilloscope
DANGER!
Don’t install
the ground
line
Don’t install
the ground
line