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LXM32 Common DC bus Application note MNA01M001EN, V1.01, 08.2014 www .schneider-electric.com MNA01M001EN, V1.01, 08.2014.
The information provided in this documentation contains general descriptions and/or technical characteristics of the performance of the products contained herein. This documentation is not intended as a substitute for and is not to be used for determining suitability or relia- bility of these products for specific user applications.
T able of contents T able of contents 3 Safety Information 5 Hazard categories 5 Qualification of personnel 6 Intended use 6 Basic information 7 DC bus voltage measurement 9 Standards and terminology 9 About the book 1 1 1 Introduction 13 1.1 Permissible device types for common DC bus 14 2 T echnical Data 15 2.
4.1 Assembling cables 42 4.2 Wiring the DC bus 45 4.2.1 Drives with connectors 45 4.2.2 Drives with terminals 47 4.2.3 Connecting the DC bus 48 4.3 V erifying installation 49 5 Commissioning 51 5.1 Commissioning procedure 52 5.1.1 DC bus connection LXM32 to LXM32 52 5.
Safety Information Read these instructions carefully , and look at the equipment to become familiar with the device before trying to install, operate, or maintain it.
Qualification of personnel Only appropriately trained persons who are familiar with and under- stand the contents of this manual and all other pertinent product docu- mentation are authorized to work on and with this product. In addition, these persons must have received safety training to recognize and avoid hazards involved.
Basic information DANGER HAZARD DUE TO ELECTRIC SHOCK, EXPLOSION OR ARC FLASH • Only appropriately trained persons who are familiar with and understand the contents of this manual and all other pert.
W ARNING LOSS OF CONTROL • The designer of any control scheme must consider the potential failure modes of control paths and, for certain critical functions, provide a means to achieve a safe state during and after a path failure. Examples of critical control functions are emergency stop, overtravel stop, power outage and restart.
DC bus voltage measurement The DC bus voltage can exceed 800 Vdc. The DC bus LED is not an indicator of the absence of DC bus voltage. DANGER ELECTRIC SHOCK, EXPLOSION OR ARC FLASH • Disconnect the voltage supply to all connections. • W ait 15 minutes to allow the DC bus capacitors to discharge.
Safety Information LXM32 10 Common DC bus MNA01M001EN, V1.01, 08.2014.
About the book This document describes how several Schneider Electric drives type LXM32 can share a common DC bus. This application note replaces application note MNA01D001. The information provided in this document supplements the manuals. Before beginning, fully read and understand the manuals of the prod- ucts used.
About the book LXM32 12 Common DC bus MNA01M001EN, V1.01, 08.2014.
1 Introduction A drive system requires energy for acceleration or constant movement that must be supplied to the system. During deceleration, a motor acts as a generator . A considerable por- tion of the kinetic energy is re-generated as electrical energy .
1.1 Permissible device types for common DC bus The DC bus of drives with identical numbers of mains phases can be connected. Single-phase drives: • LXM32 ∙∙∙∙ M2 with LXM32 ∙∙∙∙ M2 Three-phase drives: • LXM32 ∙∙∙∙ N4 with LXM32 ∙∙∙∙ N4 1 Introduction LXM32 14 Common DC bus MNA01M001EN, V1.
2 T echnical Data 2.1 Firmware version A common DC bus requires the devices to have at least the specified firmware versions: Drive Firmware version LXM32C, LXM32A V01.04.00 LXM32M V01.02.00 LXM32 2 T echnical Data Common DC bus 15 MNA01M001EN, V1.01, 08.
2.2 DC bus data Single-phase drives LXM32 ∙ ... U45M2 U90M2 D18M2 D30M2 Nominal voltage (1 ∼ ) V 1 15 230 1 15 230 1 15 230 1 15 230 Nominal voltage DC bus V 163 325 163 325 163 325 163 325 Underv.
2.3 Braking resistor LXM32 drives have an internal braking resistor and a connection for an external braking resistor . If the internal braking resistor is insuffi- cient for the dynamics of the application, one or more external braking resistors must be connected.
Three-phase drives LXM32 ∙ ... U60N4 D12N4 D18N4 D30N4 D72N4 D85N4 C10N4 Resistance value of internal braking resis- tor Ω 132 60 30 30 10 10 10 Continuous power internal braking resis- tor P PR W .
2.3.1 External braking resistors (accessories) The resistance values for external braking resistors must not be below the minimum resistance specified for the drives. VW3A760... 1Rxx 1) 2Rxx 3Rxx 4Rxx 1) 5Rxx 6Rxx 7Rxx 1) Resistance Ω 10 27 27 27 72 72 72 Continuous power W 400 100 200 400 100 200 400 Maximum time in braking at 1 15 V / 230 V s 0.
2.4 Cables for the DC bus Minimum requirement A cable for the common DC bus must meet the following require- ments. Shield: Shielded at cable lengths of > 0.
3 Engineering This chapter provides engineering information for a common DC bus for several drives. Incorrect use of the DC bus may permanently damage the drives either immediately or over time. W ARNING DESTRUCTION OF SYSTEM COMPONENTS AND LOSS OF CONTROL V erify that all requirements for using the DC bus are met.
3.1 Energy balance T o be able to estimate the effect of an interconnection of drives via a common DC bus, create an energy balance of the individual drives over a movement cycle. A movement cycle typically consists of the fol- lowing phases: acceleration, continuous movement and deceleration.
Rating v I t t D i Figure 1: Movement cycle: Profile for energy assessment This profile with velocity (v) and motor current (I) is also used for rating the motor and the braking resistor . The deceleration segment to be considered is labeled D i . Calculation of the energy at constant deceleration: The total inertia (J t ) must be known.
P c = Σ E Di Cycletime Units: P c in W , E Di in Ws and cycle time T in s These calculations allow you to select the required braking resistor . 3.2 Electromagnetic compatibility (EMC) If drives are to be operated via a common DC bus, the following aspects must be considered in terms of EMC: • Keep DC bus cables as short as possible.
3.4 Fuses The number of mains fuses depends on the input current of all drives connected via the common DC bus. Choose fuse ratings as low as possible according to the power of the drive as well as the conductor cross section. See manual of the respective product for more information.
Multiple mains fuses Multiple mains fuses are required if the total input current of all drives connected via the common DC bus exceeds the maximum fuse rating shown in the table below .
3.4.2 DC bus connection of three-phase drives Single mains fuse A single fuse is sufficient if the total input current of all drives connec- ted via the common DC bus is less than the maximum fuse rating shown in the table below .
Multiple mains fuses Multiple mains fuses are required A single fuse is sufficient if the total input current of all drives connected via the common DC bus is less than the maximum fuse rating shown in the table below .
3.4.3 Supply via the DC bus A single or multiple drives can be supplied directly via the DC bus. The supply is provided by a correspondingly sized drive or by a DC power supply unit. In the case of supply via the DC bus, DC bus fuses must be used. The DC bus fuses must be suitable for 600 Vdc.
Single DC bus fuse If the total maximum continuous current on the DC bus of all drives connected via the common DC bus does not exceed the maximum fuse rating of a drive, a single DC bus fuse is sufficient.
Multiple DC bus fuses If the total maximum continuous current on the DC bus of all drives connected via the common DC bus exceeds the maximum fuse rating of a drive, DC bus fuses are required at each drive.
3.5 Braking resistors Excess energy in the common DC bus must be absorbed by the brak- ing resistors. Depending on the application, one or more braking resis- tors can be connected. Consider the internal braking resistors of LXM32 drives in your calculations.
Further information on the subject Page T echnical data chapter "2.3 Braking resistor" 17 Commissioning chapter "5.2 LXM32: Setting the braking resistor parameters" 54 See also chapter "3.1 Energy balance", page 22 for rating information.
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 .
• Initial speed of rotation: n = 4000 min -1 • Rotor inertia: J R = 4 kgcm 2 • Load inertia: J L = 6 kgcm 2 Calculation of the energy to be absorbed: E B = 1/2 * J * (2* π *n * 1/60) 2 to 88 Ws Electrical and mechanical losses are ignored.
3.6 Mains reactor A mains reactor is required if at least one of the following criteria is met: • The output power of the drive is to be increased. • The short-circuit current rating (SCCR) of the supplying mains is greater than specified for the drives.
N/L2 L1 S2 S1 E2 E1 PC/- P A/+ DC+ DC - N/L2 L1 S2 S1 E2 E1 PC/- P A/+ N/L2 L1 Figure 1 1: Wiring of drives with individual AC fuses and mains reactors, example shows singe-phase drives. See the manual of the respective product for information on mains reactors.
3.7 Mains filter The emission depends on the length of the motor cables. If the required limit value is not reached with the internal mains filter , you must use an external mains filter . See manual of the respective product for information on mains filters.
3.8 Mains reactor and external mains filter If a mains reactor and an external mains filter are required, the mains reactor and external mains filter must be arranged according to the following illustrations for EMC reasons.
3 Engineering LXM32 40 Common DC bus MNA01M001EN, V1.01, 08.2014.
4 Installation An engineering phase is mandatory prior to mechanical and electrical installation. See chapter "3 EngineeringInstallation", page 21, for basic information. Incorrect use of the DC bus may permanently damage the drives either immediately or over time.
L1 N/L2 L1 N/L2 M2 M2 L1 L3 L2 L1 L3 L2 N4 N4 L1 L3 L2 N L1 L3 L2 N M2 M2 L1 L3 L2 N L1 L3 L2 N N4 M2 Figure 14: Specifications for drives with mains supply 4.1 Assembling cables Pre-assembled cables are available for common DC bus. If the pre- assembled cables do not have the required length, use cables and crimp contacts, see chapter "6.
4 3 A 1 2 5 C B PC/- PA/+ PC/- PA/+ Part Length in mm (inches) A Cable jacket 130 (5.2) B Length of shield connection 60 (2.5) C Stripping length 6 (0.25) Diameter ring-type cable lug / fork-type cable lug For M5 screw ▶ (1) Strip the cable jacket, length A.
The following instructions apply to drives with screw terminals for the DC bus. 3 A B 1 2 C LXM32 ∙ ... D85, C10 A mm (in) 220 (8.66) B mm (in) 50 (1.97) C mm (in) 18 (0.71) (1) Strip the cable jacket, length A. (2) Slide the shield braiding back over the cable jacket.
4.2 Wiring the DC bus NOTICE EQUIPMENT DAMAGE CAUSED BY INCORRECT POLARITY V erify correct polarity during installation. Failure to follow these instructions can result in equipment damage. The DC bus is connected by means of a plug and socket connection or screw terminals.
PC/- PA/+ Figure 16: Unlocking the DC bus connector , step 1: Push cables towards con- nector . PC/- PA/+ Figure 17: Unlocking the DC bus connector , step 2: Push cables towards con- nector , at the same time remove the connector with the other hand. If the two wires cannot move freely , the DC bus connector will not unlock.
4.2.2 Drives with terminals This chapter describes LXM32 drives with screw terminals. Properties of the connection termi- nals CN9 LXM32 ∙ ... D85, C10 Connection cross section mm 2 (A WG) 6 ... 25 (10 ... 4) T ightening torque for terminal screws Nm (lb.
4.2.3 Connecting the DC bus CN9 DC Bus PC/- P A/+ ESC W V U ESC CN9 DC Bus PC/- P A/+ W V U Figure 19: DC bus connection, example with connector ▶ V erify that the requirements concerning the DC bus are met, see chapter "3 EngineeringInstallation".
4.3 V erifying installation ▶ V erify that the wiring complies with the specifications as per chap- ter "3 EngineeringInstallation". ▶ V erify that the fuses used do not exceed the maximum permissible fuse rating. ▶ V erify that P A/+ is only connected to P A/+ and that PC/- is only connected to PC/-.
4 Installation LXM32 50 Common DC bus MNA01M001EN, V1.01, 08.2014.
5 Commissioning For commissioning, follow the commissioning instructions for the indi- vidual devices in the manual of the respective product. Incorrect use of the DC bus may permanently damage the drives either immediately or over time.
5.1 Commissioning procedure 5.1.1 DC bus connection LXM32 to LXM32 Commissioning steps: ▶ V erify proper installation of the drives and the connections for the common DC bus, see chapter "4.3 V erifying installation", page 49. ▶ Switch on the controller supply for all devices.
5.1.2 Supply via the DC bus Commissioning steps: ▶ V erify proper installation of the drives and the connections for the common DC bus, see chapter "4.3 V erifying installation", page 49. ▶ Switch on the controller supply for all devices.
5.2 LXM32: Setting the braking resistor parameters An insufficiently rated braking resistor can cause overvoltage on the DC bus. Overvoltage on the DC bus causes the power stage to be disabled. The motor is no longer actively decelerated. W ARNING MOTOR WITHOUT BRAKING EFFECT • V erify that the braking resistor has a sufficient rating.
6 Accessories and spare parts 6.1 DC bus accessories Description Order no. DC bus connection cable, 2 * 6 mm 2 (2 * A WG 10), pre-assembled, 0.1 m, 5 pieces VW3M7101R01 DC bus connection cable, 2 * 6 mm 2 (2 * A WG 10), T wisted Pair , shielded, 15 m VW3M7102R150 DC bus connector kit, connector housing and crimp contacts for 3 .
6.3 External braking resistors Description Order no. Braking resistor IP65; 10 Ω ; maximum continuous power 400 W; 0.75 m connection cable (2.1 mm 2 ), UL VW3A7601R07 Braking resistor IP65; 10 Ω ; maximum continuous power 400 W; 2 m connection cable (2.
Glossary Units and conversion tables The value in the specified unit (left column) is calculated for the desired unit (top row) with the formula (in the field). Example: conversion of 5 meters (m) to yards (yd) 5 m / 0.9144 = 5.468 yd Length in ft yd m cm mm in - / 12 / 36 * 0.
Rotation min -1 (RPM) rad/s deg./s min -1 (RPM) - * π / 30 * 6 rad/s * 30 / π - * 57.295 deg./s / 6 / 57.295 - T orque lb ‧ in lb ‧ ft oz ‧ in Nm kp ‧ m kp ‧ cm dyne ‧ cm lb ‧ in - / 12 * 16 * 0.1 12985 * 0.01 1521 * 1.1521 * 1.129*10 6 lb ‧ ft * 12 - * 192 * 1.
T erms and Abbreviations See chapter " Standards and terminology" for information on the perti- nent standards on which many terms are based.
Glossary LXM32 60 Common DC bus MNA01M001EN, V1.01, 08.2014.
T able of figures 1) Movement cycle: Profile for energy assessment 23 2) Single mains fuse for single-phase drives 25 3) Multiple mains fuses for single-phase drives 26 4) Single mains fuse for three-.
T able of figures LXM32 62 Common DC bus MNA01M001EN, V1.01, 08.2014.
Index A Abbreviations 59 Accessories External braking resistor , data 19 Accessories and spare parts 55 B Braking resistor 17 External 19 Monitoring 33 Rating 32 Selection 33 Braking resistors common .
Rating information Braking resistor 34 Rating of braking resistor 32 S Safety Information 5 Source Manuals 1 1 T T echnical data 15 T erms 59 U Units and conversion tables 57 W Wiring 45 Wiring diagram External braking resistor 47 Index LXM32 64 Common DC bus MNA01M001EN, V1.
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