Emotron MSF 2.0 Softstarter

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8.7.2 StartWith MSF 2.0, torque control, voltage control and directon-line are available as start methods. Torque control isavailable both for loads with a linear torque characteristiclike conveyors and planers and with square torque characteristicsfor pumps and fans. In general torque control isrecommended as a starting method; voltage control may beused when for some special reasons a linear voltage ramp isdesired. With Direct on-line (DOL) as a start method, neitherthe current nor the voltage will be controlled; full voltageis applied to the motor immediately. DOL can be usedto start the motor if the softstarter has been damaged andthe thyristors are short-circuited.All start methods can be combined with a current limit.However, only a properly configured torque-controlled startwill lead to constant acceleration. For this reason it is notrecommended to set a current limit for pump applications.With a proper set-up of the torque control parameters, thestarting current will be very low. For applications with variableload characteristics from start to start, the current limitfunctionality may be useful to avoid overloading the mainsfuses. However, as the motor torque is proportional to thesquare of the current, setting a low current limit will limitthe motor torque considerably. If the current limit is set toolow in relation to the application's requirements, the motorwill not be able to accelerate the load.Start method [310]In this menu the start method is chosen. The menus necessaryfor configuration of the start will be available dependingon the chosen start method.Torque controlThe default settings for initial torque at start is 10% and forend torque at start it is 150%. In Fig. 37 the resulting torquecurve is shown versus time for linear and square torque characteristics.TorqueFig. 37 Torque control at startA Properly configured torque-controlled start will lead to alinear speed increase and low starting current without currentpeaks.Current (A)End torqueNominal torqueInitial torque1 Linear2 SquareStart timeTime3 1 0Setting1Start methodDefault: 1Range: 1, 2, 3, 41 Linear torque control2 Square torque control3 Voltage control4 Direct on-line, DOLSpeedTimeTimeFig. 38 Current and speed in torque controlEmotron AB 01-4135-01r2 Functional description 57
To optimize the start, use the setting for initial torque atstart, menu [311] and end torque at start, menu [312].When the start command is given, the motor shaft shouldimmediately start to rotate to avoid unnecessary heat developmentin the motor. If required, increase the initial torqueat start.The end torque at start should be adjusted so that the timefor the motor to come up to nominal speed approximatelymatches the start time set in menu [315]. If the actual starttime is much shorter than the set start time in menu [315],the End torque at start can be decreased. If the motor doesnot reach full speed before the start time set in menu [315]has expired, the end torque at start has to be increased toavoid current peaks and jerking at the end of the ramp. Thismay be needed for high inertia loads such as planers, sawsand centrifuges.The read-out of shaft torque in percentage of T n in menu[706] may be useful for fine-tuning the start ramp.VoltageU nStartFig. 39 Menu numbers for initial voltage and start time.TimeInitial voltage at start [313]This menu is available if voltage control is chosen as startmethod in menu [310]. In this menu the initial voltage atstart is set.Initial torque at start [311]This menu is available if torque control is selected in menu[310]. In this menu the initial torque at start is set.3 1 3Setting3 1 1Initial torque at startDefault: 10%Range: 0-250% T n0-250 Initial torque at start.End torque at start [312]This menu is available if torque control is selected in menu[310]. In this menu the end torque at start is set.3 1 210SettingSetting30Initial voltage at startDefault: 30%Range: 25-90% U25-90 Sets initial voltage at start.Direct on-line, DOLIf this alternative is selected in menu [310], the motor canbe accelerated as if it was connected directly to the mains.For this type of operation:Check whether the motor can accelerate the required load(DOL start). This function can also be used with shortedthyristors.150End torque at start6-7 x I nomTimeDefault: 150%Range:25-250% T n25-250 End torque at start.Voltage controlVoltage control can be used when a linear voltage ramp isdesired. The voltage to the motor will be ramped up linearly,from initial voltage up to full mains voltage.FLCFig. 40 DOL-start.58 Functional description Emotron AB 01-4135-01r2
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Emotron MSF 2.0SoftstarterInstructi
Page 4 and 5:
Safety instructionsSafetyThe softst
Page 6 and 7:
ContentsSafety instructions .......
Page 8 and 9:
1. General informationThis manual d
Page 10 and 11: 1.8 Glossary1.8.1 AbbreviationsIn t
Page 12 and 13: 2. DescriptionT/T nn/n sIn this cha
Page 14 and 15: The disadvantage of the star-delta
Page 16 and 17: T/T n2,521,510,5Torquef 3
Page 18 and 19: 3. MountingThis chapter describes h
Page 20 and 21: Mounting schemesMSF-017 to MSF-250T
Page 22 and 23: 4. ConnectionsThe description of in
Page 24 and 25: Fig. 20 Connection of MSF-110 to MS
Page 26 and 27: Fig. 22 Connection of MSF-310 to MS
Page 28 and 29: 4.3 Minimum wiringThe figure below
Page 30 and 31: 5. How to get startedThis chapter b
Page 32 and 33: 5.5 Setting the start commandAs def
Page 34 and 35: 6. Applications and functions selec
Page 37 and 38: Table 10Applications Rating ListApp
Page 39 and 40: Table 11Application Functions ListA
Page 41 and 42: 38 Applications and functions selec
Page 43 and 44: The control panel is used for selec
Page 45 and 46: 7.7 Overview of softstarteroperatio
Page 47 and 48: 8.1 General settingsGeneral setting
Page 49 and 50: Nominal motor speed.2 1 314Nominal
Page 51 and 52: Overload time (s)Normal loadInterna
Page 53 and 54: NOTE: Check that the motor current
Page 55 and 56: 8.4.3 Reset to factory setting [243
Page 57 and 58: External alarm auto reset [257]This
Page 59: With voltage control the output vol
Page 63 and 64: Torque boost current limit [316]In
Page 65: NOTE: For several start/stops it is
Page 68 and 69: Slow speed controlled by an externa
Page 70 and 71: JOG commands can be given via analo
Page 72 and 73: Power Factor Control PFC [341]Durin
Page 74 and 75: Max power alarm [400]In this menu m
Page 76: Min power alarm response delay [410
Page 79 and 80: Undervoltage level [437]This menu i
Page 81 and 82: Relay outputsPTC inputPTCCurrent tr
Page 83 and 84: Analogue start/stop off-value [503]
Page 85 and 86: Digital input 3 function [512]In th
Page 87 and 88: Scaling analogue output, max [523]T
Page 89 and 90: K1 contact function [533]In this me
Page 91 and 92: !CAUTION: Very high currents can ar
Page 93 and 94: For applications which use the reve
Page 95 and 96: It is possible to use just one digi
Page 97 and 98: Line main voltage L1-L38.10.2 Statu
Page 99 and 100: 8.11 Alarm listThe alarm list is ge
Page 101 and 102: whether they need a Reset signal (m
Page 103 and 104: 100 Protection and alarm Emotron AB
Page 105 and 106: Observation Fault indication Cause
Page 107 and 108: Observation Fault indication Cause
Page 109 and 110: 106 Maintenance Emotron AB 014135-0
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12.3.1 Cable kit for external curre
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110 Options Emotron AB 01-4135-01r2
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Table 19Typical motor power at main
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Table 21Typical motor power at main
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13.2 General electrical specificati
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Table 25Power lossesModelPower loss
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13.5 Derating at highertemperatureB
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13.9 Semi-conductor fusesAlways use
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Table 27Parameter listMenuno.Functi
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Page 131 and 132:
Page 133 and 134:
Page 135:
Operation R .......................
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Emotron AB, Mörsaregatan 12, SE-25
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Emotron MSF 2.0 Softstarter

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