DC braking resistors, power resistors 40 Duty cycle, the governor resistor principle

Inverter braking methods currently on the market generally there are three: dynamic braking, DC braking, feedback (regenerative) braking. Inverter belong uncontrolled rectifier voltage source inverter, brake way below their dynamic braking and DC braking. Dynamic braking is Delta converter allows production machinery quickly slow down or stop the movement of the main forms; DC brake in the motor operation preparation time output direct current motor stops generating torque force to obtain a smooth start feature, or when the drive stops time output direct current motor stops generating torque force to ensure that the motor is accurate stopping. Delta converter using frequency control system, the deceleration is to be gradually reduced by a given frequency to achieve. Decrease in the frequency of the process, the motor will be in regenerative braking (generating state), so that the motor speed rapidly decreased with the decline in frequency. During braking, the pump will lead to the generation born voltage DC bus voltage rises, then the drive will control the brake unit braking resistance through the boosted voltage form of heat consumed. In order to make the system a smooth deceleration, we need to set an appropriate deceleration time and select the appropriate braking resistor and braking unit in order to meet their needs. 2 braking resistors Use This series resistor combination made from an alloy resistor resistor cabinet, suitable for high-power, high-current braking equipment, test equipment, elevators and lifting inverter dynamic braking circuit . Operating Voltage: DC 500V-2000V, rated power: 0.5KW-500KW. 3 describes the braking resistor braking resistor is used to regenerate the energy consumption of thermal energy in the motor vehicle, which includes two important parameters resistance and power capacity. Usually used in the project is more drive stainless steel brake resistor: The resistance is easy to close install, easy to additional radiator, good looks, high heat dissipation aluminum pack full encapsulation structure, with strong resistance to vibration , weather resistance and long-term stability; small size, high power, stable and convenient installation, beautiful appearance, widely used in highly harsh industrial environments. Scope 4 o braking resistor no more than 2500 meters above sea level; o ambient temperature does not exceed + 40 ℃ and no less than -30 ℃; o when + 20 ℃ to -5 ℃ when the air relative humidity less than 85%; o the surrounding medium does not enough to corrode metal and damage the insulation and potentially explosive gas and conductive dust; o must have anti-snow equipment and area is not filled with water vapor; o in areas without severe vibration or Britain lame. 4 Model Description QH-DZX -? KW -? R two cases in parallel, parallel cable select at least 20 flat above high temperature wire! 1. Outline and installation size