Schneider Electric MNA01M001EN manual Selecting an external braking resistor

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LXM32

3 Engineering

•Initial speed of rotation: n = 4000 min-1

•Rotor inertia: JR = 4 kgcm2

•Load inertia: JL = 6 kgcm2

Selecting an external braking resistor

Calculation of the energy to be absorbed: EB = 1/2 * J * (2*π*n * 1/60)2

to 88 Ws

Electrical and mechanical losses are ignored.

In this example, the DC bus capacitors absorb 23 Ws (the value depends on the device type, see chapter "2 Technical Data").

The internal braking resistor must absorb the remaining 65 Ws. It can absorb a pulse of 80 Ws. If the load is decelerated once, the internal braking resistor is sufficient.

If the deceleration process is repeated cyclically, the continuous out- put must be considered. If the cycle time is longer than the ratio of the energy to be absorbed EB and the continuous power PPR, the internal braking resistor is sufficient. If the system decelerates more frequently, the internal braking resistor is not sufficient.

In the example, the ratio EB/PPR is 1.3 s. If the cycle time is shorter, an external braking resistor is required.

The selection is made in two steps:

•The maximum energy during deceleration must be less than the peak energy that the internal braking resistor can absorb: (EDi)<(ECr). In addition, the continuous power of the internal braking resistor must not be exceeded: (PC)<(PPr). If these conditions are met, then the internal braking resistor is sufficient.

•If one of the conditions is not met, you must use an external brak- ing resistor. The braking resistor must be rated in such a way that the conditions are met. The resistance of the braking resistor must be between the specified minimum and maximum values, since otherwise the load can no longer be decelerated or the product might be destroyed.

See chapter "2.3 Braking resistor", page 17 for technical data on the external braking resistors.

MNA01M001EN, V1.01, 08.2014

Common DC bus

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Contents LXM32 LXM32 Table of contents Accessories and spare parts Hazard categories Safety InformationIntended use Qualification of personnelBasic information Loss of Control Standards and terminology DC bus voltage measurementLXM32 About the book LXM32 Introduction Permissible device types for common DC bus Firmware version Technical DataDC bus data LXM32 ∙ U45M2 U90M2 D18M2 D30M2 Braking resistorParameter DCbuscompat VW3A760 1Rxx 2Rxx 3Rxx 4Rxx 5Rxx 6Rxx 7Rxx External braking resistors accessoriesCables for the DC bus Engineering Energy balance basics Energy balanceRating DC bus connection Electromagnetic compatibility EMCFuses DC bus connection of single-phase drivesSee .2 DC fuses for fuses for the DC bus Single mains fuse for three-phase drives DC bus connection of three-phase drivesMultiple mains fuses for three-phase drives Supply via the DC bus Supply via the DC bus by a drive LXM32 Rating the braking resistor Braking resistorsPmax Rating information Selecting an external braking resistor Mains reactor L2 L1 PC/- PA/+ Mains filter Mains reactor and external mains filter LXM32 Installation Assembling cables Specifications for drives with mains supplyPart Length in mm inches LXM32∙ D85, C10 Drives with connectors Wiring the DC busNector Properties of the connection termi- nals CN9 Drives with terminalsDC bus connection, example with connector Connecting the DC busVerifying installation LXM32 Commissioning DC bus connection LXM32 to LXM32 Commissioning procedureMONMainsVolt LXM32 Setting the braking resistor parameters DC fuses Accessories and spare partsDC bus accessories External braking resistors Units and conversion tables GlossaryMoment of inertia TemperatureRotation TorqueTerms and Abbreviations LXM32 Table of figures LXM32 EMC IndexLXM32

MNA01M001EN specifications

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