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G
R500, R253, detect the DC voltage at the power circuit. The microcomputer receives a DC voltage (260-
380V) via HIC
the
DC
voltage
(Since
the
load
provided
to
perform
<
During
start
current
G
It is required to maintain the start current (DC current) constant to smooth the start of the DC motor for
the
compressor.
G
RAC-50YHA
uses
G
The start current varies when the supply voltage varies. This control method copes with variations in the
voltages
as
follows.
(1)
Turns
on
the
shown
in
Fig 8-9.
(2)
Varies
the
controlled
so
the
DC 260-360V
Chopper duty: high
20
15
10
5
0
3
7
and applies correction to the overload set value so the DC current is low (high) when
is
high
(low).
level
is
indicated
by
the
same
overload
0
G
0
control
>
software
to
control
+
power
module's
U
turn-ON
time
of
the
W
start
current
is
approx.
DC current
+
U
Ð
U
Detection
resistor
Start
the
DC
voltage
multiplied
judgement
even
when
Rotation speed
Fig. 8-8
the
start
current.
Ð
and
V
transistors
so
+
transistor
according
10A
as
shown
in
Fig.
Power module
+
+
V
W
Ð
Ð
V
W
Fig. 8-9
DC voltage (start current)
Fig. 8-10
– 90 –
by
DC
current,
R247,
the
voltage
varies.)
Amplification : low
DC voltage : low
DC current : high
Amplification : 8.5 times
DC voltage : 260V
Amplification : high
DC voltage : high
DC current : low
the
current
flows
to
the
to
the
DC
voltage
level
8-10.
Compressor motor
U
V
W
DC voltage: low
DC voltage: 280V
DC voltage: high
Set value
Time
R248,
R249
are
motor
windings
as
and
the
start
is
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