Magnetek Sway Control System (SCS®) Series 2

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SCS Series 2 Benefits

  • Enhances safety in operations and reduce the potential for personnel injuries and damage to equipment
  • Reduces maintenance costs and downtime by decreasing stresses on structural, mechanical, and control components

SCS Series 2 has been designed to:

  • Require only one IMPULSE Variable Frequency Drive (VFD) per traverse motion with SCS software. Additional IMPULSE VFDs are connected in a Master/Slave fashion
  • Operate in V/F, Open Loop Vector and Flux Vector* control methods
  • Be compatible with existing master switch and radio control configurations such as Multi-step and Infinitely Variable Uni-Polar/Bi-Polar analog
  • Eliminate the need for an external programmable logic controller
  • Accept a hook height measurement when combined with an IMPULSE®•VG+ Series 4* hoist drive
  • Eliminate the need for a high maintenance feedback device such as an absolute encoder. The system can also be configured to operate in an operating hook height “zone”
  • Work with multiple hoists on the same bridge

Performance Features

  • Optional inputs available to fine tune the pendulum length when using multiple below the hook attachments or varying load sizes
  • Automatic hook height measurement when combined with an IMPULSE•VG+ Series 4* hoist
  • Seamless integration with special functions within IMPULSE VFDs such as MicroSpeed™ and Reverse Plug Simulation™, end of travel slow down and stop limits
  • Enabling or disabling with the flip of a switch

System Limitations

  • 100 Ft. Hoist height (consult factory for greater than 100 Ft. of lift)
  • Motion must be stopped prior to enabling/disabling SCS function

*Consult factory for use with IMPULSE•VG+ Series 4

Sway Control System (SCS®) for Retrofit Installations

Magnetek’s IMPULSE Sway Control System (SCS) Series 2 custom software can be added to any brand of existing bridge or trolley variable speed drive. This external retrofit system provides the benefit of sway control on an existing crane installation.

Improved Safety and Performance

  • Improves productivity by allowing the crane operator to move loads at full speed and come to a stop without needing to wait for load sway to dampen
  • Improves the accuracy of load placement
  • Enhances operational safety by reducing the potential for personnel injuries and damaged equipment caused by accidental contact with swinging loads
  • Reduces maintenance costs and downtime by decreasing stresses on structural, mechanical, and control components
  • Decreases the training time required to learn how to handle a swinging load

Flexible Features Make it Easy to Use

  • Available in single or dual motion sway control systems
  • Use existing 120VAC master switch inputs- 24VDC, 24VAC, and 48VAC inputs optional (must be specified at time of order)
  • Analog or digital hook height feedback input with hook attachment adjustments
  • Analog or pulse train sway control frequency reference
  • Compatible with almost any variable speed drive
  • Reduce sway by 85-95%
  • Take advantage of Magnetek Material Handling crane functions – Reverse Plug Simulation – Quick Stop – Micro-Speed – Inching
  • Enable or disable Sway Control at the radio transmitter or pendant station

Minimum Requirements

  • Compatible with 2 to 5 speed multi-step or analog speed references
  • Variable speed drive must have a 0-10V, +10/-10V, or pulse train 0-32 kHz analog input that can be programmed as a speed reference
  • Ability to adjust acceleration, deceleration, and S-curve times to zero (or near zero)


  • Power Requirements: 230VAC, 460VAC, or 575VAC models available
  • Digital Inputs: Six multi-function 120VAC inputs per motion
  • Relay Outputs: Three multi-function 120VAC form A outputs and one 120VAC form C fault output. Two are typically used as directional outputs
  • Variable Hook Height Feedback: Two 0-10VDC analog inputs (Main or Aux Hoist) or digital inputs can be used to improve sway reduction and crane performance
  • Enclosure: NEMA 4/12 with screw latches
  • Operator Interface: 10-button keypad with LCD display mounted on the enclosure door
  • Ambient Operating Temperature: -10° to 60°C (14° to 140°F)

Example Application Block Diagram


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