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Danfoss VLT Скачать руководство пользователя страница 39

VLT

®

Soft Starter Pocket Guide

39

Soft braking is a technique used by the soft starter to reduce motor
stopping time, unlike soft stopping which increases the stop time on
frictional loads. Soft braking requires the use of reversing contactors.

When the soft starter receives a stop command, it operates the
reversing contactor connected on its input side to soft start the motor
in the reverse direction. This applies braking torque to the load.

Motor speed detection is required to shut down the braking at motor
standstill.

Soft starters can also use ‘DC braking’ to reduce the stopping time,
but soft braking causes less motor heating and provides more braking
torque for a given current, and is better for extremely high inertia loads
(e.g. band saw and circular saw applications).

Soft Braking: What is soft braking?

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Содержание VLT

Страница 1: ...Pocket Guide VLT Soft Starter the single speed drive MAKING MODERN LIVING POSSIBLE...

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Страница 3: ...ds 20 Harmonics 21 Inside delta Connection 22 IP Ratings 23 Nema Ratings 24 Key Bene ts 25 Line Contactor 26 Minimum Start Current 27 Motor Thermal Capacity 28 Multiple Motors 29 Power factor correcti...

Страница 4: ...5 MCD3000 with MCD Remote Operator Option 46 MCD3000 Modbus Option 47 MCD3000 DeviceNet Option 48 MCD3000 Pro bus Option 49 MCD200 with MCD Remote Operator Option 50 MCD200 Modbus Option 51 MCD200 Dev...

Страница 5: ...d motor For applications with extreme or unusual conditions consult the relevant Design Guide and or your supplier For example High altitude installation 1000 m High ambient temperatures 40 C High and...

Страница 6: ...ial fan Bottle Washer Centrifuge Chipper Compressor centrifugal rotary Compressor reciprocating unloaded Compressor screw unloaded Conveyor loaded Conveyor unloaded Crusher cone Crusher jaw Crusher ro...

Страница 7: ...Pelletiser Planer Press Pump bore Pump centrifugal Pump positive displacement Pump slurry Pump submersible Pump vacuum Re pulper Rotary table Sander Saw band Saw circular Shredder Separator liquids Se...

Страница 8: ...it Soft stop Timed voltage ramp Motor protection Thermistor Motor overload Phase imbalance System protection Phase rotation Excess start time Bypass overload Instantaneous overload Metering optional e...

Страница 9: ...ts Network communication AP ASCII plus options for DeviceNet Modbus and Pro bus Bypass Dedicated terminals for external connection MCD3000 Current 7 5 kW 800 kW 400 V Mains voltage 200 690 VAC Supply...

Страница 10: ...D 201 007 18 17 Consult Danfoss for suitability MCD 201 015 34 30 MCD 201 018 43 36 MCD 201 022 48 40 MCD 201 030 60 49 MCD 201 037 74 65 MCD 201 045 85 73 MCD 201 055 100 96 MCD 201 075 146 120 MCD 2...

Страница 11: ...D3090 172 164 143 MCD3110 205 194 169 MCD3132 211 202 178 MCD3185 326 489 261 392 222 333 MCD3220 383 575 308 462 262 394 MCD3300 507 761 393 590 329 493 MCD3315 600 900 456 684 377 566 MCD3400 775 11...

Страница 12: ...07 152 150 205 483 280 246 210 159 160 220 520 300 256 220 170 185 250 595 342 295 263 200 200 270 626 370 321 281 215 220 300 700 408 353 310 235 250 340 800 460 401 360 274 257 350 826 475 412 365 2...

Страница 13: ...he length and current level of the start and the percentage of the operating cycle that the soft starter will be running passing current AC53b Bypassed soft starters The rating depends on the number o...

Страница 14: ...d or unloaded starts and the start torque cannot be freely adjusted to match motor and load characteristics Damaging torque and current transients still occur at the steps between voltages and auto tr...

Страница 15: ...ure IP54 it must be bypassed Bypass contactors should be AC1 rated for the motor FLC the bypass contactor does not carry start current Soft starters may be internally or externally bypassed MCD 200 so...

Страница 16: ...MCCB rating motor FLC x 1 2 1 Inside delta motor circuit cable rating motor FLC x 0 7 2 Installation factors including grouping ambient temperature method of installation and single or parallel cablin...

Страница 17: ...motor is running fully loaded the voltage drop at the motor terminals does not exceed the limit speci ed in local electrical regulations For distances greater than 500 metres cable capacitance may be...

Страница 18: ...start current starts per hour duty cycle and environmental factors such as ambient temperature and altitude If the soft starter will be used outside these conditions the rating must be revised accordi...

Страница 19: ...kW and FLC Main supply voltage and frequency Control voltage Application e g pump compressor Time installed before failure Details of other soft starters on the supply bus Are these failing If the so...

Страница 20: ...le the faster the motor is rotating in the forward direction the shorter the start time will be If the motor is rotating in the reverse direction it will be slowed to a standstill before accelerating...

Страница 21: ...l and electronic equipment Soft starters generate very low levels of harmonics only during starting or soft stopping According to IEC 60947 4 2 8 3 2 1 1 harmonic emissions are of short duration durin...

Страница 22: ...starters can be connected using inside delta A line contactor or shunt trip MCCB must always be used to disconnect the motor and soft starter from the supply in the event of a trip Inside delta connec...

Страница 23: ...an 2 5 mm e g tools or wires Protected against sprays of water up to 60 from vertical 4 Protected against solid objects greater than 1 mm e g tools and small wires Limited protection against water spr...

Страница 24: ...n dust rain splashing water hose directed water and ice IP 66 4X Indoor or outdoor some protection from corrosion windblown dust rain splashing water hose directed water and ice IP 66 6 Indoor or outd...

Страница 25: ...s resulting in lower start currents and or shorter start times Start performance can be adjusted to suit the motor and load including exact control over the current limit Soft starting provides reliab...

Страница 26: ...from damage due to severe overvoltage e g lightning strikes SCRs are most susceptible to overvoltage damage when in the o state The soft starter is also isolated from the supply in the event of a trip...

Страница 27: ...will stall if the start current is too low In order to start successfully the motor must produce more acceleration torque than the load requires throughout the start Successful start Unsuccessful star...

Страница 28: ...ime describes the maximum time a motor can run at locked rotor current from cold This information is usually available from the motor datasheet The MCD202 and MCD3000 overload protection can be set to...

Страница 29: ...sequence the soft starter must be capable of bearing the total start duty Installation requires additional wiring plus separate overload protec tion and line and bypass contactors for each motor The...

Страница 30: ...e used MCD202 and MCD3000 soft starters provide current limit starting and can be used to parallel start motors which are the same size and mechanically coupled If the motors are di erent sizes and or...

Страница 31: ...tarter connecting PFC capacitors to the output of a soft starter causes resonance between the inductance of the motor and the power factor capacitance resulting in severe overvoltage and equipment fai...

Страница 32: ...eristics Performance may vary with multiple starts in close succession because the start pro le changes as the resistance heats up Damaging torque and current transients still occur at the steps betwe...

Страница 33: ...and reverse contactors can be used to provide the same e ect Some soft starters o er a part speed function which can run the motor at slow speed in either the forward or reverse direction without a re...

Страница 34: ...lation or through the enclosure s walls This includes heat not only from the soft starter but also from other components such as fuses cabling and switchgear Heating from the soft starter can be minim...

Страница 35: ...rt current Typical selection criteria are as follows Rating Motor FLC Start Current Starter type Protection Type 350 FLC 15 seconds 350 FLC 15 seconds MCD200 Fuse non time delayed 175 200 Fuse time de...

Страница 36: ...miconductor fuses which must be able to carry motor start current and have a total clearing I2t less than the I2 t of the soft starter SCRs Semiconductor fuses for Type 2 circuit protection are additi...

Страница 37: ...0 MCD200 075 170M 1322 500 FMM 168000 MCD200 090 170M 3022 500 FMM 245000 MCD200 110 170M 3022 500 FMM 320000 Semiconductor fuses listed below are manufactured by Bussmann and should be ordered direct...

Страница 38: ...idering a soft starter for slip ring applications a trial should be conducted to verify the performance To develop starting torque some resistance must remain in the rotor circuit during motor startin...

Страница 39: ...reversing contactor connected on its input side to soft start the motor in the reverse direction This applies braking torque to the load Motor speed detection is required to shut down the braking at...

Страница 40: ...h motor and load characteristics In addition the open transition between star and delta connection causes damaging torque and current transients Star delta starters are not capable of providing soft s...

Страница 41: ...ter If the soft starter does not support inside delta connection connect the delta connection to the output side of the soft starter MCD3000 soft starters support inside delta connection models MCD318...

Страница 42: ...ial without nuisance tripping Compared with a motor thermal model thermal overload relays are less precise They do not account for iron loss or for di erent cooling rates at di erent stages of motor o...

Страница 43: ...e speed is selected using external contactors AC3 rated Dahlander motors are often used for two speed compressor or fan applications The motor windings are externally con gured using contactors for hi...

Страница 44: ...ect on line starter Soft starters which control two phases can reduce start current as 2 well as eliminating torque transients and are suitable for normal and heavy duty loads but not severe loads The...

Страница 45: ...Monitor the soft starter thermal model overload temperature MCD3000 and MCD202 only Danfoss WinMaster is a PC Windows based software which allows control monitoring and parameter management of soft s...

Страница 46: ...d for each MCD3000 If two Remote Operators are required the RS485 Network side of the rst Remote Operator terminals B6 B7 B8 must be connected to the RS485 starter side of the second Remote operator t...

Страница 47: ...rators can be used as Modbus slave devices on a single Modbus network The Remote Operator requires an external 18 30 VAC DC auxiliary supply For more information on operating the MCD Remote Operator a...

Страница 48: ...et Gateways can be used as DeviceNet slaves on a single DeviceNet network The DeviceNet Gateway is powered via the network cable For more information on the MCD3000 DeviceNet Gateway refer to the User...

Страница 49: ...using DIP switches 1 to 8 on the MCD Pro bus Gateway Both ASCII soft starter and Pro bus DP cable termination is provided using standard DB9 connectors on the MCD Pro bus Gateway If you require use of...

Страница 50: ...B7 B8 must be connected to the RS485 Starter side of the second Remote Operator terminals B1 B2 B3 The rst Remote Operator is ordered using Cat No 175G9004 and the second Remote Operator is ordered us...

Страница 51: ...using two 8 way DIP switches on the module Up to 31 Modbus Modules can be used as Modbus slave devices on a single Modbus RTU network The Modbus Module is powered up by the MCD200 For more information...

Страница 52: ...ve devices on a single Modbus network The Serial Interface Module is powered via the MCD200 The Remote Operator requires an external 18 30 VAC DC auxiliary supply For more information about operating...

Страница 53: ...used as DeviceNet slaves on a single DeviceNet network The DeviceNet Module is powered via the network cable The MCD DeviceNet Module is ODVA tested and certi ed For more information on the MCD Device...

Страница 54: ...tically detected Up to 31 Pro bus Modules can be used as Pro bus slaves on a single Pro bus DP network The Pro bus Module requires and external 24 VDC auxiliary supply The MCD Pro bus Module is Pro bu...

Страница 55: ...accelerates gas through a housing then converts the velocity energy to pressure energy Normally used in heavy industrial applications Compressor positive displacement see Compressor reciprocating Comp...

Страница 56: ...rrent limit NOTE The Start Ramp setting will not necessarily match the actual motor start up time Debarker a machine that strips bark from logs Decanter a type of centrifuge Edger a machine that cuts...

Страница 57: ...ely run at locked rotor current Locked rotor torque the amount of torque a motor will produce at locked rotor current such as a full voltage start Locked rotor torque is described as a percentage of f...

Страница 58: ...e inlet to the outlet under its own momentum The uid s velocity increases as it progresses through the impeller passage Di user ring or volute cavities reduce the velocity of the uid and convert the e...

Страница 59: ...ars objects such as paper plastic or wood into smaller pieces Slabber a machine consisting of several saws which cuts edged logs into smaller pieces before further processing Slicer a machine that sli...

Страница 60: ...urrent DOL Direct On Line FLC Full Load Current FLT Full Load Torque HRC High Rupturing Capacity IP International Protection kW Kilowatt MCCB Moulded Case Circuit Breaker PFC Power Factor Correction S...

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Страница 62: ...62 VLT Soft Starter Pocket Guide...

Страница 63: ...VLT Soft Starter Pocket Guide 63...

Страница 64: ...99 Fax 07 3630 2122 Adelaide Tel 08 8150 7400 Fax 08 8443 8033 Perth Tel 08 9333 3800 Fax 08 9479 7200 Auckland Tel 09 270 2110 Fax 09 270 2112 Christchurch Tel 03 379 4365 Fax 03 379 4365 www danfoss...

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