NISHITEI Co., Ltd. who is an expert of resistors. (Kitakyusyu, Japan)

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

The resistors are connected to DC bus circuit of an inverter, consumes the regeneration power from a motor, and is made to generate braking torque from the motor. For the small capacity inverters, a compact size and a light weight for the braking resistor units are realized by adopting noncombustible cement resistors. Since the cement resistors are excellent on safety, voltage withstanding capability, and also in insulation performance, the cement resistors can be used for long-term with high reliability. For medium and larger braking resistors, Since the enclosure is made into the wall mounted type, it does not take a mounting space too much. Moreover, it is devised so that maintenance of internal resistor elements can also be performed easily. It is provided as an option that a protective relay such as a thermal overload relay or a temperature detector for protecting resistor burning out.For medium and larger braking resistors,the stainless steel grid resistor elements are applied. Various duty cycles are available such as 10%, 15%, 20%, 30%, 40%, and 50% duty cycle(%ED).

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 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.