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Specification & Description
| Specification | Description |
|---|---|
| Part Number | BU-H15K |
| Alternative Part Number | BUH15K |
| Manufacturer | Mitsubishi |
| Application | Used for applications requiring large brake torque for motors operated by inverters |
| Voltage | Less than 800V DC |
| Operating Voltage | 740V DC ± 3V |
| Braking Torque | 50% for 30 seconds; capable of 100% for 30 seconds depending on motor combination |
| Ambient Temperature | -10°C to +50°C (14°F to 122°F) |
| Painting Colour | Munsell 5Y 8/1 (50% luster) |
| Approximate Weight | 3.5kg (7.7lbs) |
| Compatibility | Designed to work with 400V class transistorized inverters |
| Installation Requirements | Must be installed on an incombustible surface away from combustible materials |
| Safety Features | Includes a discharging resistor burning prevention circuit to protect against overheating |
| Additional Features | Can be used in parallel configurations for increased braking capacity |
| Dimensions | Refer to the manufacturer's documentation for detailed dimensions and external view |
| Circuit Configuration | Utilises a voltage divide resistor and operational amplifier for controlled braking |
| Maintenance | Periodic inspection recommended; resettable via a RESET button after thermal relay trip |
| Disposal | Treat as industrial waste; follow local regulations for electronic equipment disposal |
The Mitsubishi BU-H15K is a robust brake unit designed to enhance the performance of inverters in demanding industrial applications. This unit is particularly suited for scenarios that require significant braking torque, such as when a motor is driven by a 400V class transistorised inverter, or when rapid deceleration is necessary due to the motor being rotated by a load.
Crafted with precision, the BU-H15K operates effectively within a DC line voltage of less than 800V and an operating voltage of 740V DC ± 3V. It is engineered to deliver consistent braking torque, with a standard rating of 50% for 30 seconds, ensuring reliable performance in various operational conditions.
The unit's ambient operating temperature range from -10°C to +50°C allows it to function optimally in a wide range of environmental conditions. Its approximate weight of 3.5kg makes it a manageable addition to your system without compromising on durability.
The Mitsubishi BU-H15K is finished in a Munsell 5Y 8/1 colour, which provides a professional appearance while maintaining a 50% luster that is suitable for industrial environments. Its design considerations include safety features that prevent electric shock and fire hazards, making it a safe choice for integration into your existing systems.
This brake unit is an essential component for applications that demand high-performance braking capabilities and is a testament to Mitsubishi's commitment to quality and reliability in automation technology.
Commonly Asked Questions
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Frequently Asked Questions
What applications is the BU-H15K suitable for?
The BU-H15K is designed for applications that require high brake torque, such as when a motor operated by an inverter is rotated by a load or when sudden deceleration is necessary.
Can the BU-H15K be used with any inverter?
The BU-H15K is compatible with specific 400V class transistorized inverters. It is important to check the compatibility of the inverter with the brake unit before use.
What are the operating conditions for the BU-H15K?
The BU-H15K operates at a voltage less than 800V DC, with an operating voltage of 740V DC ± 3V, and an ambient temperature range of -10°C to +50°C.
How should the BU-H15K be installed?
The BU-H15K should be mounted on a vertical surface in a vertical direction to ensure optimal heat dissipation. It should not be installed horizontally or on a horizontal surface.
What precautions should be taken when wiring the BU-H15K?
When wiring the BU-H15K, use the appropriate wire size as specified in the manual, ensure the wiring distance is minimized, and avoid contact with the discharging resistors due to their high temperature.
What type of discharging resistors should be used with the BU-H15K?
The BU-H15K requires specific discharging resistors with the correct resistance value and capacity. Using resistors with lower specifications may lead to failure of the brake unit or overheating of the resistors.
How can I prevent the discharging resistors from overheating?
To prevent overheating, install the discharging resistors in a well-ventilated area, use heat-resisting wires, and maintain adequate clearance from other components.
What should be done if the internal thermal relay of the BU-H15K trips?
If the internal thermal relay trips, switch off the inverter's input power to prevent overheating of the discharging resistors. Reset the brake unit using the RESET button and adjust the motor's deceleration time to a longer value.
Is there a specific orientation for mounting the discharging resistors?
Yes, the discharging resistors should be mounted with a minimum clearance of 5mm from any surface and with clearances of at least 60mm between resistors or between a resistor and panel for proper heat dissipation.
What is the approximate weight of the BU-H15K?
The approximate weight of the BU-H15K is 3.5kg.
Part conditions explained
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New unsealed: The product is in its original packaging, but the packaging has been opened or unsealed. It has never been used and should be in near pristine condition.
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Refurbished: The product has been previously used, but it has undergone a thorough refurbishment process to restore it to a like-new or functional condition. Any defects or issues have been addressed, making it suitable for reuse.
Used: The product has been previously owned and has been used. It may show signs of wear and tear but is still functional and operational. The condition may vary depending on the specific item and its usage history.
