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- - - February 19, 2003 - - - +++++++++++++++++++++++++++++++ Topic: Braking Resistors for Variable Frequency Drives Application: Regeneration of Variable Frequency Drives When a drive unit is attempting to rapidly brake a motor “Deceleration Braking Cycle” or when an “overhauling load” condition exists, the spinning motor acts as a generator. This freewheeling condition will force some voltage back into the drive unit (regeneration) which may cause an over voltage condition if the energy is not absorbed somewhere else. Solution: Braking Resistors Braking resistors are used to absorb energy that is being regenerated back into a drive unit by a freewheeling motor. The energy is released in the form of heat. Filnor Braking Resistors are sized based on the following customer supplied information: 1. Voltage: DC bus Voltage 2. Drive horsepower 3. Braking Torque 4. Duty Cycle: On time/Off time 5. The maximum braking current or minimum ohmic value as specified by the drive manufacturer 6. Regeneration Type 7. Deceleration braking or Overhauling Load Filnor standard Braking resistors have the following features: * Well ventilated enclosure for indoor or outdoor applications * Wall or Roof Mount * Built-in Junction box with multiple conduit knockouts * Front Mounted Nameplate with complete ratings Options Include: * Stainless steel enclosure, or special paint * Wired to a terminal block with high temperature wire * Thermal overload (N.C. or N.O. contacts) Filnor can provide you with a complete list of standard braking resistors or quote you per your requirements. Please Contact Filnor for more information. +++++++++++++++++++++++++++++++ |
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