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Hitachi L100 instruction manual Basic System Description, Motor Thermal switch, Name Function

Models: L100

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L100 Inverter

2–5

Basic System Description

A motor control system will obviously include a motor and inverter, as well as fuses for safety. If you are connecting a motor to the inverter on a test bench just to get started, that’s all you may need for now. But a system can also have a variety of additional components. Some can be for noise suppression, while others may enhance the inverter’s braking performance. The figure and table below show a system with all the optional components you may need in your finished application.

From power supply

Cut-off switch

L1

L2

L3

 

 

+1

 

 

+

 

Inverter

 

 

–

 

 

GND

T1

T2

T3

Motor

Thermal switch

Name

Function

 

 

 

 

Fuse

Current overload protection for power

 

supply and wiring.

 

 

Input-side

This is useful in suppressing harmonics

AC Reactor

induced on the power supply lines, or when

 

the main power voltage imbalance exceeds

 

3% (and power source capacity is more

 

than 500 kVA), or to smooth out line fluctu-

 

ations. It also improves the power factor.

 

 

Radio noise filter

Electrical noise interference may occur on

 

nearby equipment such as a radio receiver.

 

This magnetic choke filter helps reduce

 

radiated noise (can also be used on output).

 

 

EMI filter (for

Reduces the conducted noise on the power

CE applications)

supply wiring generated by the main power

 

supply to protect the inverter. Connect to

 

the inverter primary (input side).

 

 

Radio noise filter

This capacitive filter reduces radiated noise

(use in non-CE

from the main power wires in the inverter

applications)

input side.

 

 

DC link choke

Suppresses harmonics generated by the

 

inverter. However, it will not protect the

 

input diodes.

 

 

Dynamic

This is useful for increasing the inverter’s

braking unit &

control torque for high duty-cycle (on-off)

resistor

applications, and improving the decelerat-

 

ing capability.

 

 

Radio noise filter

Electrical noise interference may occur on

 

nearby equipment such as a radio receiver.

 

This magnetic choke filter helps reduce

 

radiated noise (can also be used on input).

 

 

AC reactor

This reactor reduces the vibrations in the

 

motor caused by the inverter’s switching

 

waveforms, by smoothing the waveforms to

 

approximate commercial power quality. It

 

is also useful when wiring from the inverter

 

to the motor is more than 10m in length, to

 

reduce harmonics.

 

 

LCR filter

Sine wave shaping filter for output side.

 

 

Note that some components are required for regulatory agency compliance (see Chapter 5).

and Installation

Inverter Mounting

 

 

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Hitachi L100 instruction manual Basic System Description, Motor Thermal switch, Name Function
Page 35 Page 37

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.