Schneider Electric MNA01M001EN manual Rating information

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3 Engineering

LXM32

Use only resistors that are specified as braking resistors. See chapter "2.3 Braking resistor", page 17 for suitable braking resistors.

Connection of braking resistor Braking resistors with degree of protection IP65 may be installed out- side the control cabinet in an appropriate environment in order to decrease the temperature in the control cabinet.

The external braking resistors listed in the Accessories chapter are shipped with an information sheet that provides details on installation.

Further procedure:

•Connect the braking resistors to the drive.

•LXM32: Check the parameter RESint_ext during commissioning. This parameter allows you to switch between internal and external braking resistor.

•LXM32: If you have connected an external braking resistor to an LXM32 drive, you must set the parameters for the external braking resistor during commissioning.

•During commissioning, test the braking resistors under realistic conditions, see page 54.

Wire ferrules: If you use wire ferrules, use only wire ferrules with col- lars for these terminals.

3.5.2Rating information

To rate the braking resistor, calculate the proportion contributing to absorbing braking energy.

An external braking resistor is required if the kinetic energy that must be absorbed exceeds the total of the internal proportions, including the internal braking resistor.

The energy Evar is the square difference between the voltage before the deceleration process and the response threshold.

The voltage prior to the deceleration process depends on the mains voltage. The energy absorption by the DC bus capacitors is lowest when the mains voltage is highest. In the calculation, use the values for the highest mains voltage.

Energy absorption braking resistor Two characteristic values determine the energy absorption of the braking resistor:

•The continuous power PPR is the amount of energy that can be continuously absorbed without overloading the braking resistor.

•The maximum energy ECR limits the maximum short-term power that can be absorbed.

If the continuous power was exceeded for a specific time, the braking resistor must remain without load for a corresponding period.

The characteristic values PPR and ECR of the internal braking resistor can be found in chapter "2 Technical Data".

See page 22 for information on assessing the electrical and mechani- cal losses.

Example: LXM32 drive Deceleration of a rotary motor with the following data:

MNA01M001EN, V1.01, 08.2014

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Common DC bus

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Contents LXM32 LXM32 Table of contents Accessories and spare parts Safety Information Hazard categoriesQualification of personnel Intended useBasic information Loss of Control DC bus voltage measurement Standards and terminologyLXM32 About the book LXM32 Introduction Permissible device types for common DC bus Technical Data Firmware versionDC bus data Braking resistor LXM32 ∙ U45M2 U90M2 D18M2 D30M2Parameter DCbuscompat External braking resistors accessories VW3A760 1Rxx 2Rxx 3Rxx 4Rxx 5Rxx 6Rxx 7RxxCables for the DC bus Engineering Energy balance Energy balance basicsRating Electromagnetic compatibility EMC DC bus connectionDC bus connection of single-phase drives FusesSee .2 DC fuses for fuses for the DC bus DC bus connection of three-phase drives Single mains fuse for three-phase drivesMultiple mains fuses for three-phase drives Supply via the DC bus Supply via the DC bus by a drive LXM32 Braking resistors Rating the braking resistorPmax Rating information Selecting an external braking resistor Mains reactor L2 L1 PC/- PA/+ Mains filter Mains reactor and external mains filter LXM32 Installation Specifications for drives with mains supply Assembling cablesPart Length in mm inches LXM32∙ D85, C10 Wiring the DC bus Drives with connectorsNector Drives with terminals Properties of the connection termi- nals CN9Connecting the DC bus DC bus connection, example with connectorVerifying installation LXM32 Commissioning Commissioning procedure DC bus connection LXM32 to LXM32MONMainsVolt LXM32 Setting the braking resistor parameters DC bus accessories Accessories and spare partsDC fuses External braking resistors Glossary Units and conversion tablesTorque TemperatureRotation Moment of inertiaTerms and Abbreviations LXM32 Table of figures LXM32 Index EMCLXM32

MNA01M001EN specifications

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