Hitachi S1 Series User Manual

S1 series standard inverter
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Chapter 3 Product overview
3.1 What this chapter contains
This chapter mainly introduces the operation principles, product features, layouts, nameplates and
model instructions.
3.2 Basic principle
S1 series inverter is used to control asynchronous AC induction motor. The figure below shows the
main circuit diagram of the inverter. The rectifier converts AC voltage into DC voltage, and the inverter
converts DC voltage into the AC voltage used by AC motor.
L
N
U
V
W
（+）
PE PE
PB
Fig 3.1 230V main circuit diagram
R
S
T
U
V
W
（+）
PE PE
PB
Fig 3.2 400V (0.75kW–2.2kW) main circuit diagram
R
S
T
U
V
W
（+）
（-）
PE PE
PB
Fig 3.3 400V (4kW–15kW) main circuit diagram

Hitachi S1 Series Specifications

General

Output Frequency	0 - 400 Hz
Overload Capacity	150% for 60 seconds
Frequency	50/60 Hz
Control Method	Sensorless Vector Control
Protection Functions	Overcurrent, Overvoltage, Undervoltage, Overheat, Short Circuit
Communication	RS485, Modbus RTU
Output Voltage	3-Phase 200-240VAC, 3-Phase 380-480VAC (Matches Input Voltage)
Cooling Method	Fan Cooled