HITACHI LYD105A

Description

Introduction to the HITACHI LYD105A

Product Description

The HITACHI LYD105A is a variable frequency drive (VFD) from Hitachi’s industrial automation portfolio, specifically within their L100 series or a related energy-saving inverter line. This device is an electronic controller designed to vary the speed and torque of a standard three-phase AC induction motor by adjusting the frequency and voltage of the power supplied to it. The HITACHI LYD105A is engineered for general-purpose applications where motor speed control, soft starting, and energy savings are desired. It converts fixed-frequency AC mains power into a variable-frequency, variable-voltage output, enabling precise control of pumps, fans, conveyors, and other motor-driven machinery. The compact and user-friendly design of the LYD105A makes it a popular choice for system integrators and OEMs. The configuration of the HITACHI LYD105A is typically done via a built-in keypad or optional software.

Product Parameters

• Brand & Series: Hitachi Inverter (e.g., L100 Series, Energy-Saving Inverter)

• Model: LYD105A

• Device Type: Variable Frequency Drive (VFD) / AC Drive

• Power Rating: The suffix “105A” typically indicates a specific output current rating (e.g., 10.5 Amps) which corresponds to a motor power rating (e.g., 3.7 kW / 5 HP at 400V).

• Input Voltage: Designed for common three-phase AC input voltages (e.g., 380-480VAC, 50/60 Hz).

• Output: Three-phase, variable frequency and voltage output for motor control.

• Control Method: Sensorless vector control or V/f (voltage-to-frequency) control for stable operation across a wide speed range.

• Control Features: Includes adjustable acceleration/deceleration ramps, multiple preset speeds, electronic thermal motor overload protection, and a variety of programmable digital and analog inputs/outputs.

• Enclosure: Typically an IP20 / Open Type chassis for panel mounting, requiring an external enclosure for protection.

• Communication: Often features built-in RS-485 communication for Modbus RTU protocol, allowing integration into control networks.

Advantages and Features

The primary advantage of the HITACHI LYD105A is its ability to provide efficient and flexible motor speed control, leading to significant energy savings in applications like pumps and fans where load varies (affinity laws). It offers a soft start function, which reduces mechanical stress on the motor and driven equipment, extending their lifespan. The drive includes comprehensive motor protection features (overcurrent, overload, overvoltage, etc.) and user-friendly programming. Its compact size saves valuable panel space. The LYD105A is known for its reliability and stable performance, contributing to reduced maintenance and downtime.

Application Cases in Industry

This drive is widely used in applications requiring variable speed operation. In HVAC systems, the HITACHI LYD105A controls fans in air handling units and pumps in chilled water systems. In water and wastewater treatment, it adjusts the speed of transfer pumps, aerators, and mixer drives to match process demand. Within material handling, it provides speed control for conveyors and packaging machines. It is also commonly applied in general manufacturing for machine tools, agitators, and exhaust fans, improving process control and energy efficiency.

Comparison with Competing Products

Competing products include general-purpose VFDs from manufacturers like Mitsubishi Electric (FR-D700), Schneider Electric (Altivar 312), Danfoss (VACON 100), and ABB (ACS350). The HITACHI LYD105A competes through its combination of performance, reliability, and competitive pricing. Compared to basic V/f drives, it often offers more advanced features like improved torque performance at low speeds. Its value proposition is strong in the mid-range general-purpose market, where ease of use, a robust feature set, and good technical support are key decision factors. The choice may come down to brand preference, specific feature requirements, and local distributor support.

Selection Suggestions and Precautions

Selecting the HITACHI LYD105A requires matching its output current rating (105A) to the full-load amperage (FLA) of the motor it will control, ensuring a margin of 10-20% above the motor FLA. Verify the input voltage range matches the facility’s power supply. Consider the required control features: number of preset speeds, analog input requirements, and communication needs. For long motor cable runs, an output filter or choke may be necessary to protect the motor from reflected waves, which is a general precaution for all VFDs.

Precautions:

• Installation and wiring must be performed by qualified personnel following the drive’s manual and local electrical codes.

• Ensure proper grounding of both the drive chassis and the motor frame to prevent electrical noise and ensure safety.

• Use shielded cables for control wiring and separate them from power cables to minimize electromagnetic interference (EMI).

• Parameter settings must be correctly configured for the specific motor (rated current, voltage, base frequency) to ensure proper protection and performance.

• The drive does not provide disconnection/isolation; a properly rated disconnect switch or circuit breaker must be installed upstream.

• For motor overload protection, rely on the drive’s electronic thermal relay function, and typically bypass any separate external thermal overload relay.

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