A resistor installed on a machine or system needs replacing, but the original model is no longer available. The manufacturer no longer makes it, lead times are incompatible with the company’s needs, or an alternative has to be found.
An industrial resistor can be correctly sized from an electrical standpoint and, at the same time, be unsuitable for the environment in which it will have to work. Temperature, humidity, dust, water, corrosive agents and installation conditions can all affect the choice of component, its ability to dissipate heat and its service life.
During braking, the motor regenerates energy back into the DC bus: if that energy isn’t managed, the voltage rises until the protections trip. The resistor absorbs it and dissipates it as heat. The key is choosing the right one for the application, and the variable that really makes the difference is the duty cycle, not just the motor power. Let’s look at what you need to arrive at the right value.
KRAH GROUP