Hitachi RPI-1.0FSG1 - AC Chopper

3-12
MAIN PARTS
3.2 AC Chopper
Reduction of Electromagnetic Sound
Fan Motor Control by AC Chopper:
Lower electromagnetic sound and vibration have been achieved by AC Chopper control than thyristor
control.
AC Chopper Control
Concept of Fan Speed Control
The voltage applied to the fan motor is controlled by chopping
(ON/OFF) the power supply voltage at a frequency of 20kHz.
Features
• Sinusoidal Wave Pattern and Remarkable Low Level of Electromagnetic Sound
• No Generation of Harmonic Current
(1) Specifications
Rated Current of AC Chopper
2.1A
5.6A
Applicable Power Source
Output Volta
g
e
Output Current
(
Maximum
)
2.1A 5.6A
Control Method
Choppin
g
Frequenc
y
Input Dut
y
Si
g
nal
Accurac
y
of Output Volta
g
e
Output/Characteristics
Soft Start
Overcurrent Protection Method
Overcurrent Settin
g
(
Minimum
)
2.1A 5.6A
Overcurrent Protection Area
100kHz
+ 5% Current 2 to 8mA + 10%
+ 6%
Input Dut
y
: 10%/s
Current Limiter
Sin
g
le Phase 220/240V + 10% 50/60Hz
Sin
g
le Phase 220/240V + 10%
AC Chopper Control
20kHz + 20%
(Max. x 2)
(Max. )
010 50
Output Current (A)
Input Duty (%)
30
: Protection Area
4A
10 50
Output Current (A)
Input Duty (%)
30
: Protection Area
40
50Hz
60Hz
3.5A
4.75
0
[For 5.6A]
b
a
d
c
100
010 50
Output Duty (%)
Input Duty (%)
Input Duty = b/a
Output Duty = d/c