Hitachi's SJ300 Series Variable Frequency Drive Delivers Full Feature Performance Across
A Wider Range of Demanding Applications Requiring High Starting Torque and Functional Versatility.
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Adaptive/Basic auto-tuning
Auto-tuning to perform sensorless vector control can now be easily
done both on-line and off-line.
Adaptive auto-tuning makes it possible for the motor characteristics to
be updated automatically under real timeambient conditions (i.e.
primary resistance changes as motor reachestemperature rise).
CONTENTS
SJ300
SJ300
Compact
Size
Global
Standards
Powerful
Operation
Easy
Maintenance
High-
performance
High-
function
Features
Standard Specifications
Dimensions
Operation and Programming
Function List
Terminals
Protective Functions
Connecting Diagram
Connecting to PLC
Wiring and Accessories
Accessories
For Compact Panel
Torque Characteristics, Derating Data
For Correct Operation
1
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4
5
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7
8
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11
12
13
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18
19
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20
21
22
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23
24
25
26
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41
42
43
44
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45
1
2
PAGE
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High starting torque of 200% or greater at 0.5Hz
■
Speed regulation at low speed has been drastically
improved to enhance process stability and precision.
Powerful high torque performance has been accomplished
using Hitachis advanced sensorless vector control.
100
-100
-200
-300
0
200
300
0.5Hz
300 600 900 1200 1500 1800
(
r/min
)
Torque(%)
Rotation speed
Example of SJ300-055LFU driving a Hitachi's standard 3-phase 5.5kW 4-pole totally enclosed type motor. <Base frequency of 60Hz> (Note: Torque characteristics may vary according to capacity.)
Comparison of speed regulation
15%
5%
●SJ300-055LFU
Speed regulation Speed regulation
●J300-055LFU (previous series)
Tor que characteristics
Frequency commanded by the inverter: 3Hz.
Motor: Hitachi's standard 3-phase 5.5kW 4-pole totally enclosed type motor.
■
High torque of 150% near 0Hz
High torque of 150% near 0Hz is accomplished
when the SJ300 drives a smaller motor by one frame size,
and uses the “0Hz Domain” function.
Hitachi variable frequency
drives (inverters) in this
brochure are produced at the
factory registered under the
ISO 14001 standard for
environmental management
system and the ISO 9001
standard for inverter quality
management system.
ISO 14001
EC97J1095
ISO 9001
JQA-1153
Torque characteristics right after
off-line auto-tuning
[Output frequency: 20Hz]
[Motor condition: Cold]
Torque characteristics after the
continuous operation of the motor
[Output frequency: 20Hz]
[Motor condition: Hot]
Torque characteristics right after
on-line auto-tuning
[Output frequency: 20Hz]
[Motor condition: Hot]
Basic auto-tuning Adaptive auto-tuning
100
200
torque
(%)
Rotation speed
r/min
600
Rotation speed
r/min
100
200
torque
(%)
600
10r/min
Rotation
speed
r/min
100
200
torque
(%)
600
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