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LEKTROMIK S
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Electronic Soft Starters

Soft starting and soft stopping of three-phase induction motors at powers up to 800 kW

Applications

  • Pumps
  • Fans and compressors
  • Conveyor belts
  • Grinding machines, saws
  • Fast and heavy-duty conveyor systems
  • Drives using pole-change motors
  • Machines with gearbox, belt or chain drives
  • User benefits

    Mechanical
    • Reduced cost of transmission components
      • Low starting torque
      • Starting torque adjustable to requirement
    • Reduced maintenance costs
      • Low starting torque reduces belt slip
    • Lower repair cost
      • Fatigue effects reduced (Star/delta, transformer and single-phase starting cause high torque peaks)
    • Machine protection
      • Electronic overload trip (with OPTION LS-I1)

    Electrical

    • Low starting current
      • Advantages compared with star/delta
      Low maintenance costs
      • Low-loading of contactor contacts with zero-current switching
    • Only two voltage ranges
      • 3AC 110...500 ±10% V
      • 3AC 220...690 ±10% V

    Features

  • An external bridging contactor can be used to reduce losses
  • Shutdown on detection of phase failure during ramp up
  • Can be combined with electronic d.c. injection brake (refer to technical manual LEKTROMIK B4)
  • OPTION LS-I1 provides for:
    Current limit during ramp-up with switch-on pulse, monitoring of power with overload trip (stall protection), power factor improvement at low load special circuit to damp drive oscillation (e.g. with pumps), energy saving circuit for lightly loaded drives
  • OPTION LS-I2 provides for:
    Current limit during ramp-up, start monitoring, optimised operation with pumps
  • OPTION LS-N provides for:
    Closed-loop speed control for load-independent starting, operation for pumps
  • Principle of operation

    The following alternative LEKTROMIK soft starters can be supplied:
    • S2 in the conventional standard connection in series with the motor
    • SD2 connected within the delta motor winding
    Advantage:
    • high motor power for same soft-start current
    The modes of operation "Soft Start" and "Soft Stop" make use of thyristors in a fully controlled connection. The three thyristor pairs vary the voltage applied to the motor using phase control. The torque of the motor can be varied over a wide range.

    The motor voltage increases as ramp function during soft start.The starting voltage ( = switch-on voltage) and the inclination ( = acceleration) are adjustable within a wide range. A monitoring signal "End of Ramp" indicates the end of ramp up.

    With soft stop operation the voltage can be reduced to zero as a ramp function. This can prevent a load with a large frictional component from stopping too abruptly.The main contactor is opened with zero current on completion of ramp down. This provides a considerable increase in the life of the main contactor.

    Available Types

    Available Types LEKTROMIK S2 LEKTROMIK SD2
    Motors Three-phase induction motors, no. of connection cables
    3
    6
      Pole-change motors
    •  
    •  
      Slip-ring motors Refer to supplier Refer to supplier
    Modes of operation Soft start
    •  
    •  
      Soft stop
    •  
    •  
      Regen. Braking n>ns
    •  
    •  
      Electronic braking with: LEKTROMIK B4 Refer to supplier
    Features Phase control 3 PH. W3C 3 Ph. Delta 
    Functions Operation with bridging contactor
    •  
    •  
      Current limit with OPTION LS-I1/2 OPTION LS-I1/2
      Switch-on pulse, overload trip, power factor improvement, ...with OPTION LS-I1 OPTION LS-I1
      Closed-loop speed control,  -operation OPTION LS-N OPTION LS-N
      Electronic contactor operation   Refer to supplier
    Power range at rated voltage 1.1...800 kW/
    3AC 250...500 V
    7.5...1300 kW/
    3 AC 250...500 V

    Typical installations

    • Centrifugal pumps in the water and sewerage industry – elimination of water-hammer problems
    • Fans – reduction of high starting current, V-belt wear and starting noise
    • Screw compressors – starting with minimum starting current
    • Oil pumps – starting on oil rigs with a DG supply
    • Bow thruster starting – starting with minimum current on a ship DG supply
    • Speed-change agitators in sewerage plant – shock-free starting and speed change of pole-change motors
    • Piston compressors, Circular saws – starting with minimum starting current
    • Refrigeration compressors on ships – soft start with minimum starting current
    • Heavy duty conveyor belts in power stations – smooth starting with minimum loading on belt material
    • Mills – starting and positioning stop at loading position
    • Reverse-flow heat exchangers in power stations – 400, 500 and 690 V installations
    • Mixers, Extruders, Stone crushers – soft start and electronic shearp on overload

    Available Types
    LEKTROMIK 4...37S2/55SD2
    up to 45/75 kW 

    Motor power Supplyvoltage Equipment code Dimensions [mm] Special features
    min..normal BC Height  Width Depth
    400 V   3AC LEKTROMIK        
    1.1 .. 4.0 kW 7.5 kW 110 ... 500 V 4S2-26 220 168 110
    • Fan > 22S2/37SD2 power supplied from soft starter
    2.2 ... 11 kW 15 kW 110 ... 500 V 11S2-26 220 168 145
    4.0 ... 22 kW 30 kW 110 ... 500 V 22S2-26 320 168 145
    7.5 ... 37 kW 45 kW 110 ... 500 V 37S2-26 320 168 170
    7.5 ... 37 kW 45 kW 110 ... 500 V 37SD2-26 320 168 145
    7.5 ... 55 kW 75 kW 110 ... 500 V 55SD2-26 320 168 170
    BC operation with bridging contractor

    LEKTROMIK 75S2/110SD2
    up to 90/132 kW

    Motor power Supply voltage Equipment code Dimensions [mm] Special features
    min..normal BC Height Width Depth
    400 V   3AC LEKTROMIK        
    7.5 .. 75 kW 90 kW 110 ... 500 V 75S2-26 415 260 250
    • Fan power supplied from soft starter
    11 ... 110 kW 132 kW 110 ... 500 V 110SD2-26 415 260 250

    BC operation with bridging contractor

    LEKTROMIK 160...800S2/250...1300SD2

    up to 800/1300 kW

    Motor power
    min..normal
    Supply voltage Equipment code Dimensions [mm] Special features
    Height Width Depth
    400 V 3AC LEKTROMIK        
    7.5 ... 160 kW 110 ... 500 V 1602-26 450  350 435
    • Control module separate with 1.5m ribbon cable
    • Fan for 2AC 230 V ext. control voltage
    7.5 ... 250 kW 110 ... 500 V 250S2-26 570  376 365
    7.5 ... 400 kW 110 ... 500 V 400S2-26 738  540 400
    7.5 ... 600 kW 110 ... 500 V 630S2-26 788  590 510
    7.5 ... 800 kW 110 ... 500 V 800S2-26 788  590 510
               
    11 ... 250 kW 110 ... 500 V 250SD2-26 450  350 435
    11 ... 400 kW 110 ... 500 V 400SD2-26 570  376 365
    11 ... 630 kW 110 ... 500 V 160SD2-26 738  540 400
    11 ... 1000 kW 110 ... 500 V 1000SD2-26 788  590 510
    11 ... 1200 kW 110 ... 500 V 1300SD2-26 788  590 510

    Options

    Descriptons Equipment code Special features
    OPTION
    Current limit and additional functions LS-75I1-26  for 4...37S2, 37/55SD2
    • Recommended for pumps
     
    LS-150I1-26  for 75S2/110SD2
    LS-750I1-26  for 160...400S2, 250...630SD2
    LS-2000I1-26 for 630...800S2, 800...1300SD2
    Current limit and start monitoring LS-I2-26
    Closed-loop speed control LS-N1-26
    • - ramps
    EMC filter for class B interference level LS-F/230
    • For control voltage

    Special versions

    Description Equipment code Special features
    • Supply voltage 220 ... 690 V
    LEKTROMIK S2-26/690
    • Ramp time extension
    OPTION 4.7MF
    • 6 ... 50 s

    Product conformance

    EMV-
    RICHTLINIE
    NIEDERSPANNUNGS -
    RICHTLINIE
    MASCHINEN -
    RICHTLINIE
    • EC Declaration of Conformity with CE marking based on:
      • Product standard IEC 947-4-2
      • RF interference EN 55011
      • Immunity EN 61000-4-2/-3/-4/-5
    • Class B interference limit - suitable for unrestricted operation on public electricity supplies
    • EC Declaration of Conformity with CE marking
    • Standard used:
      • IEC 947-4-2
      • EN  50178
    • Manufacturer’s declaration is available
    • Designed for installation accordance with EN 60204-1
    Versions with UL, c-UL Abnahmen
    • Standard used:
    • UL508C
    • UL840