Manufacturer: NISHITEI Co., Ltd.

The resistors are connected in the DC bus circuit of the inverter, absorb motor regeneration power, and generate appropriate braking torque from motors.

Features

The resistors are connected to the DC bus circuit of an inverter, where they consume the regenerative power from a motor and are designed to generate braking torque for the motor. For small-capacity inverters, a compact size and lightweight braking resistor units are achieved by using noncombustible cement resistors. Since these cement resistors are excellent in terms of safety, voltage withstanding capability, and insulation performance, they are highly reliable for long-term use.

On the other hand, for medium and larger braking resistors, the enclosure is designed in a wall-mounted type, which not only saves valuable mounting space but also makes the installation process more efficient. Additionally, this design ensures that maintenance of the internal resistor elements is straightforward and easy to perform.

Furthermore, as an added benefit, a protective relay—such as a thermal overload relay or a temperature detector—can be included as an option to safeguard against resistor burnout. For medium and larger braking resistors, stainless steel grid resistor elements are utilized, offering improved durability and performance.

Lastly, various duty cycles are available, including 10%, 15%, 20%, 30%, 40%, and 50% duty cycles (%ED), allowing the resistors to be tailored to meet different operational requirements.

General specification

Standard Braking Resistor Unit
Basic Specifications

• Withstand Voltage: 2500VAC-1min.for main circuit
  1500VAC-1min.for control circuit
• Insulation Resistance: over 50 MΩ/500V megger
• Allowable Resistance: within ±10 %

Braking resistor units

Braking Resistor Unit Specifications

• Separate Mounted Type
• Deceleration Time: within 10 sec.
• Operation Cycle: 100 sec.( 10% Duty ･10% ED)
• VFD* Braking Torque : approx. 100 %

* VFD: Variable Frequency Drives

Options

• Special design is available on deceleration times, operation duty cycles, and all kind of requirements.
• Provided 10%, 15%, 20%, 30%, 40%, and 50% duty cycle(%ED)as a standard duty.

Product photo

DC784V 121A 6.5Ω 8%ED	DC730V 128A 2×2.2Ω 100%ED