3-Phase
AC Motor

L100 Inverter

1–9

Inverter Input and Three-Phase Power

Heavy industrial machinery often needs the additional power available from higher voltage/current sources, and from three-phase power. The Hitachi L100 Series of invert- ers includes two sub-groups: the 200V class and the 400V class inverters. The drives described in this manual may be used in either the United States or Europe, although the exact voltage level for commercial power may be slightly different from country to country. Accordingly, a 200V class inverter requires (nominal) 200 to 240VAC, and a 400V class inverter requires from 380 to 460VAC. Some 200V class inverters will accept single-phase or three-phase power, but all 400V class inverters require a three-phase power supply.

The common terminology for single phase power is Line (L) and Neutral (N). Three- phase power connections are usually labeled Line 1 (L1), Line 2 (L2) and Line 2 (L3). In any case, the power source should include an earth ground connection. That ground connection will need to connect to the inverter chassis and to the motor frame (descrip- tion given on page 2–16).

Getting Started

Inverter Output to the Motor

The AC motors also use three-phase power, but they

 

must connect only to the inverter’s output terminals. The

 

output terminals are uniquely labeled (to differentiate

U/T1

them from the input terminals) with the designations U/

 

T1, V/T2, and W/T3. This corresponds to typical motor

 

lead connection designations T1, T2, and T3. It is

 

generally not critical to connect a particular inverter

 

output to a particular motor lead for a new application.

 

The consequence of swapping any two of the three

W/T3

connections is the reversal of the motor direction. For

 

safety reasons, you must connect the motor chassis

ground to the ground connection at the bottom of the inverter housing.

V/T2

Earth

GND

Notice the three connections to the motor do not include one marked “Neutral” or “Return.” The motor represents a balanced “Y” impedance to the inverter, so there is no need for a separate return. In other words, each of the three “Hot” connections serves also as a return for the other connections, because of their phase relationship.

The Hitachi inverter is a rugged and reliable device. The intention is for the inverter to assume the role of switching power to the motor during all normal operations. Therefore, this manual instructs you not to switch off power to the inverter while the motor is running (unless it is an emergency stop). Also, do not install or use cut-off switches in the wiring from the inverter to the motor (except thermal cut-off). Of course, safety- related devices such as fuses must be in the design to break power during a malfunction.

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Hitachi L100 instruction manual Inverter Input and Three-Phase Power, Inverter Output to the Motor

L100 specifications

The Hitachi L100 series is a versatile range of variable frequency drives (VFDs) designed to enhance performance in various industrial applications. Known for their reliability and efficiency, these drives are widely used in motors for pumps, fans, compressors, and conveyors.

One of the main features of the Hitachi L100 is its impressive control capabilities. The drive supports both scalar and vector control modes, allowing for precise speed and torque management. This flexibility ensures optimal motor performance across different load conditions. Additionally, the L100 series offers an impressive speed range, which can accommodate a wide variety of applications, from low-speed to high-speed requirements.

The L100 is equipped with built-in functionality for energy saving. By utilizing advanced control algorithms and auto-tuning features, the drive optimizes energy consumption, reducing operational costs and contributing to improved overall system efficiency. The energy-saving mode is particularly beneficial in applications where load conditions frequently change.

Another hallmark of the Hitachi L100 is its robust communication capabilities. The drive supports various communication protocols including Modbus and Ethernet, making it easy to integrate into existing control systems. This connectivity allows for real-time monitoring and diagnostics, which aids in predictive maintenance and minimizes downtime.

In terms of user-friendliness, the L100 series includes a clear, intuitive keypad that simplifies programming and operation. The drive also features a wide range of customizable parameters, enabling users to easily tailor the settings to suit specific application requirements. Additionally, the inclusion of a customizable PID controller allows users to refine process control automatically.

Safety is a priority in the design of the Hitachi L100. The drive comes with various built-in safety features such as overvoltage, overload, and short-circuit protection, ensuring reliable operation in challenging environments. Furthermore, it complies with global safety standards, making it suitable for international applications.

Lastly, the L100's compact design ensures easy installation and minimizes the space required in control cabinets. This is especially advantageous in facilities where space is at a premium. Overall, the Hitachi L100 series represents a combination of advanced technology, user-friendly features, and reliable performance, making it a popular choice for industrial automation solutions.