Schneider Electric MNA01M001EN manual Pmax

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LXM32

3 Engineering

 

 

 

 

 

Further information on the subject

 

Page

 

Technical data chapter "2.3 Braking resistor"

 

17

 

 

 

 

 

Commissioning chapter

 

54

 

"5.2 LXM32: Setting the braking resistor parameters"

 

 

See also chapter "3.1 Energy balance", page 22 for rating information.

Internal braking resistor A braking resistor to absorb braking energy is integrated in LXM32 drives. The device is shipped with the internal braking resistor active.

If the braking energy of all drives sharing a common DC bus is greater than the energy the internal braking resistors can absorb, you must use an external braking resistor. Consider the most extreme case of your application in calculating the braking energy.

Example: In the case of an EMERGENCY STOP, all drives decelerate simultaneously; the braking resistors must be able to absorb the entire braking energy.

External braking resistor An external braking resistor is required in applications in which the braking energy is greater than the energy that can be absorbed by the drives sharing a common DC bus. Consider the most extreme case of your application in calculating the braking energy.

Example: In the case of an EMERGENCY STOP, all drives decelerate simultaneously; the braking resistors must be able to absorb the entire braking energy.

LXM32: Monitoring LXM32 drives monitor the load on the connected braking resistor. The load on the braking resistor can be read out.

The connection of the external braking resistor is short-circuit protec- ted. A ground fault of the braking resistor is not detected.

Selection of the external braking The rating of an external braking resistor depends on the required resistor peak power and continuous power with which the braking resistor can

be operated.

The resistance R is derived from the required peak power and the DC bus voltage.

R =

U2

MNA01M001EN, V1.01, 08.2014

Pmax

R = Resistance value in Ω

U = Switch-on voltage braking resistor in V Pmax = Required peak power in W

If 2 or more braking resistors are connected to one drive, note the fol- lowing criteria:

The braking resistors must be connected in parallel or in series so the required resistance is reached. Only connect resistors with identical resistance in parallel in order to evenly distribute the load to all braking resistors.

The total resistance of all external braking resistors connected to one drive must not fall below a lower limit.

The continuous power of the network of connected braking resis- tors must be calculated. The result must be greater than or equal to the actually required continuous power.

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 Accessories and spare parts DC bus accessoriesDC fuses External braking resistors Units and conversion tables GlossaryRotation TemperatureTorque Moment of inertiaTerms and Abbreviations LXM32 Table of figures LXM32 EMC IndexLXM32

MNA01M001EN specifications

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