Veichi Bu30 Series Brake Unit User Manual

VEICHI BU30 series Brake Unit

Preface

Thank you for choosing BU30 series energy braking unit. BU30 series adopts advanced power electronics technology and high performance MCU controller, combined with a new generation of IGBT power devices, a high performance braking products. This series of products can be applied to elevators, cranes, hoists, centrifuges, oilfield pumping machines and other occasions. Its products can release the electrical energy generated by the motor in the braking process through the power resistor (braking resistor) to produce enough braking torque to ensure the normal operation of the inverter and other equipment. This manual provides matters such as product installation and assembly lines, parameter setting and troubleshooting. To ensure proper installation and operation of this product and to take advantage of its superior performance, please read this manual in detail before use. This manual is a complimentary accessory, please keep it in a safe place and give it to the user of this machine. We are always striving for continuous improvement of our products, so the information about this series is subject to change without notice. We apologize for any inconvenience this may cause.

Security Information

Purchase Inspection

1. Whether the specifications and models of the products match the ordered products.
2. Our products have undergone strict testing and quality inspection before leaving the factory, please check whether there is a certificate of conformity, product manual and warranty card.
3. Check if there is any damage inside the machine. If there is obvious damage, please do not operate and use the machine and contact the distributor or our company in time to avoid accidents.

Safety and wiring considerations

• Wiring operations must be performed by professionally qualified personnel, otherwise there is a risk of electric shock.
• When installing and wiring, the brake unit and other equipment such as inverters connected to it must be disconnected and wait for more than 10 minutes to confirm that the power stored in the capacitors of each related equipment is discharged before operating to ensure safety.
• The ground terminal of the brake unit must be grounded safely and securely, otherwise the equipment cannot work properly or there is a risk of electric shock.
• Once energized, the internal parts of the brake unit carry a dangerously high voltage and direct human contact should be avoided, otherwise it will endanger lives.

Attention

• The positive and negative terminals of the DC bus of the brake unit should not be reversed, otherwise it may not work or even cause damage to the equipment itself and related equipment, and there is a fire hazard.
• The brake unit should be installed in a well-ventilated area, otherwise the equipment may not work properly or may be damaged.
• Avoid dropping screws, gaskets and other metal objects inside the brake unit, as this may cause damage to the equipment. Make sure the case box cover is closed during use.
• Frequency converter, braking unit, braking resistance between the cable connection can not exceed 10 meters, please use shielded wire parallel signal line, the line length does not exceed 0.5 meters.

Product Introduction

Name plate and model description

Model Description

Brake unit output specifications

The following table shows the recommended selection table for 380V and 660V machines. Type specification of energy consumption brake unit

Note:
Minimum resistance: is the minimum value of braking resistance allowed to be connected to the braking unit.The actual braking resistor used must be selected according to the capacity of the equipment and the required braking torque, and not less than the minimum resistance va lue of the braking unit.

Technical Specifications

Installation

Mechanical mountin dimensions（Unit：mm）

Definition of terminal arrangement 

Terminal arrangement order：

Wiring diagram

1. Single machine wiring diagram
2. Wiring diagram for parallel operation of multiple machines

Main circuit wiring diagram

Note：
The BU30 is able to adapt automatically when the brake unit is connected in parallel. In the few cases where automatic adaptation is not possible, it is necessary to adjust F4.00 (Braking Voltage) with the keyboard, For example, if the + – bus voltages of two units do not match, then we can adjust the braking voltage of either brake unit to accommodate. The keypad of AC70T can be used on BU30 to adjust the keypad of the brake unit as  follows：

Keyboard Function

Basic parameter setting

Indicates that the parameter cannot be changed while the drive is running.

Monitoring parameters

Fault Information

Note： 

1. E.oL1 Alarm indicator flashes once at 2-second intervals.
2. E.oc1 alarm indicator flashes 3 times at 2-second intervals.
3. E.Oh2 alarm indicator flashes 5 times at 2-second intervals.
4. E.HAL alarm indicator is always on.
5. When setting parameters, you need to disassemble the brake unit panel and insert the standard keyboard of our inverter into the DB9 keyboard port of the brake unit PCB to set parameters.

Braking Resistor Selection

The braking resistor selection is based on the power generated by the motor in the actual application. It is related to the system inertia, deceleration time, bit energy load, etc. It needs to be selected by the customer according to the actual situation. The larger the inertia of the system, the shorter the deceleration time and the more frequent the braking, the larger the power of the braking resistor required and the smaller the resistance value.

Selection of resistance value of braking resistor

• It can be based on the formula：PD = 2/R
• The formula U – the selected brake voltage grade
• PD-Braking power

Braking resistor power selection 
The braking resistor needs to be derated by 70% when used. According to the formula.PR=PD*KC/0.7

• In the formula PR – braking resistor power
• PD-Braking power
• KC-Braking frequency

The braking frequency of common load types takes the following values for Kc in general

• Elevator Ke=10-15%
• Lowering height of more than 100m crane Kc=2040%
• Oilfield head knocker Ke=1020%
• Unwinding and winding Ke=50~60%
• Centrifuge Kc=5~20%
• Occasional braking of loads Ke=5%
• Other Kc=10%

The following table describes the braking resistor resistance, resistance power for the recommended value, if you need to use in the large inertia, long time frequent braking and special occasions, please provide the formula calculation and the selected inverter specifications, the rated parameters of the braking unit, appropriate adjustment of the braking resistor resistance and resistance power