Hitachi S1 Series User Manual

S1 series standard inverter
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overload is detected, users must cut off the current. The inverter is equipped with motor thermal
overload protection function, which will block output and cut off the current (if necessary) to protect
the motor.
4.5.4 Bypass connection
In some critical occasions, industrial frequency conversion circuit is necessary to ensure proper
operation of the system when inverter fault occurs.
In some special cases, eg, only soft startup is needed, it will converts to power-frequency operation
directly after soft startup, corresponding bypass link is also needed.
 Do not connect any power source to inverter output terminals U, V and W. The
voltage applied to motor cable may cause permanent damage to the inverter.
If frequent switch-over is needed, users can use the switch which carries mechanical interlock or a
contactor to ensure motor terminals will not be connected to input power cables and inverter output
ends simultaneously.

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