Altivar 71 And Altivar 71 Plus Variable Speed Drives Page 53 Accessories and Options

53 Altivar 71 variable speed drives Accessories & Options Dynamic Braking Accessories Dynamic braking resistors Dynamic braking (also referred to as resistance braking) allows the Altivar 71 to maintain control of the motor when the motor becomes an energy generator. Examples of a motor becoming a generator could be a hoist lowering a load, a downhill conveyor that is fully loaded, or a high inertia load requiring a fast deceleration time. The motor can become a generator when the load attached to the motor overhauls the motor. When the motor becomes a generator, the drive can be used to manage the energy being transferred from the load; through the motor back to the drive needs to be managed. For applications where a significant amount of energy is being regenerated by the load, it may be prudent to consider an active front-end drive or engineer a system of Altivar 71 drives with a common DC bus tie. The active front-end is a second power section added between the Altivar 71 and the incoming power line and synchronizes the generated energy back to the incoming power line. A system of Altivar 71 drives with a common DC bus tie is common in applications where one load requires acceleration, while another is decelerating. Contact your Schneider Electric representative if you believe your application could benefit from an active front-end solution or DC bus tie solution. For many applications where the motor becomes an energy generator, dynamic braking resistors can be used with the Altivar 71 to maintain control of the motor and manage speed and torque. The dynamic braking resistors are connected to the DC bus on the Altivar 71 through a transistor (also referred to as a chopper or dynamic braking transistor). When connected to a resistor, this transistor turns on before the energy coming back from the motor elevates the DC bus voltage to overvoltage trip level. The generated energy is then able to flow to the resistors and this energy is dissipated in the form of heat. The following drives have a dynamic braking transistor built in: ATV71H ppp M3, ATV71H ppp M3X, ATV71H075N4HC16N4, ATV71H ppp S6X, and ATV71HU22Y HC16Y. An external braking transistor is required for ATV71HC20N4HC50N4 and ATV71HC20YHC63Y. Powerohm Type BM Braking Modules monitor the DC bus voltage of the Altivar 71 and allow power to flow to the external braking resistors to avoid over-voltage trips and allow the Altivar 71 to provide braking torque. These braking modules are available in three voltage ranges. Powerohm Part Number RMC Continuous Load Current Turn ON Voltage Max Peak Current Dimensions A B C D E 240 Nominal Line Voltage ATVBM2-50 50 390 200 6.38 5.13 11 8.88 5.88 ATVBM2-115 115 390 200 6.38 5.13 12.75 8.88 5.88 ATVBM2-150 150 390 300 6.38 5.13 12.75 8.88 5.88 ATVBM240-450 450 390 600 7.13 10 20 5 19 ATVBM240-600 600 390 900 7.13 10 20 5 19 ATVBM240-900 900 390 1200 10.06 10 24 7 23 ATVBM240-1200 1200 390 1800 10.06 10 24 7 23 480 Nominal AC Line Voltage ATVBM4-50 50 775 200 6.38 5.13 11 8.88 5.88 ATVBM4-115 115 775 200 6.38 5.13 12.75 8.88 5.88 ATVBM4-150 150 775 300 6.38 5.13 12.75 8.88 5.88 ATVBM480-450 450 775 600 7.13 10 20 5 19 ATVBM480-600 600 775 900 7.13 10 20 5 19 ATVBM480-900 900 775 1200 10.06 10 24 7 23 ATVBM480-1200 1200 775 1800 10.06 10 24 7 23 600 Nominal AC Line Voltage ATVBM6-50 50 970 200 6.38 5.13 11 8.88 5.88 ATVBM6-115 115 970 200 6.38 5.13 12.75 8.88 5.88 ATVBM6-150 150 970 300 6.38 5.13 12.75 8.88 5.88 ATVBM600-450 450 970 600 7.13 10 20 5 19 ATVBM600-600 600 970 900 7.13 10 20 5 19 ATVBM600-900 900 970 1200 10.06 10 24 7 23 ATVBM600-1200 1200 970 1800 10.06 10 24 7 23 M1 3 L1 L2 L3 ATV71H ppp M3 ATV71H ppp M3X ATV71H075N4HC16N4 ATV71H ppp S6X ATV71HU22YHC16Y Braking transistor Braking resistor M1 3 L1 L2 L3 Braking transistor Braking resistor ATV71HC20N4HC50N4 ATV71HC20YHC63Y

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