Technical Data 　High-speed lifters 　LIFT MASTER 　Selection

Cautions for Product Selection

1. Acceleration/deceleration times

  • ・LIFT MASTE achieves high-speed operation, and inverter drives are essential with a three-phase motor. Please make sure to operate with sufficient acceleration and deceleration time.
    Also, when a servo motor is used, provide sufficient acceleration/deceleration time.
    Rapid acceleration and quick stop may affect stopping accuracy or cause workpiece vibration.
    When LIFT MASTER shakes depending on the table or arm rigidity or the load condition, take a longer acceleration and deceleration time when starting or stopping the operation.
    Consider fixing the upper end of LIFT MASTER to reduce workpiece vibration.
  • ・The "speed" shown in the standard model list (ball screw type and trapezoidal screw type) is the maximum speed.
    Make sure to consider the acceleration/deceleration time when calculating lifting/lowering time.
  • ・Using a servomotor drive is recommended when faster lifting time, higher-frequency operation, multi-point positioning, or synchronized operation are required.

2. Inverter control

  • ・Provide an inverter regenerative resistor with sufficient capacity according to the operating conditions to handle the large regenerative current generated during lowering.Consult the inverter manufacturer for regenerative resistor capacity.
  • ・Use of an inverter with a capacity larger than that of the motor is recommended.
  • ・Set up a sequence for activating the brake in the event the inverter trips.

3. Fall prevention

  • ・LIFT MASTER is driven by an induction motor with brake. When a servomotor is prepared by the customer, make sure to select a brake type with a keyway on the shaft.
    Also prepare a fall prevention mechanism to protect against falls.Fall prevention pins are available upon request.

4. Servomotor control

  • ・Use servo motors at or below the rated rotation speed.
  • ・Provide an regenerative resistor with sufficient capacity according to the operating conditions to handle the large regenerative current generated during lowering.
  • ・Do not use the built-in mechanical brake for braking even when stopping in an emergency. Be sure to use control logic that activates the mechanical brake after deceleration by the dynamic brake. For details, refer to the motor manufacturer's instruction manual.

Product Selection

Operating conditions

  • 1. Application and required number of ZIP MASTER
  • 2. Lifting mass amount
  • 3. Speed
  • 4. Stroke
  • 5. Overhung load
  • 6. Frequency of use
  • 7. Operating environment

Selection procedure

  • 1. Check whether the machine, usage method, and usage environment are suitable for Lift Master.
  • 2. Select a model number with a rated load that satisfies the lifting load from the standard model list (ball screw type and trapezoidal screw type).
    ※Consider using multiple synchronized units if the lifting load will exceed the rated load.
    Contact a Tsubaki representative for more information on selecting and controlling multiple synchronized units. High load specifications are also available upon request. Contact a Tsubaki representative for more information.
  • 3. Check if the lifting speed is satisfied with the nominal speed of the selected model number.
    ※Specifications with higher lifting speeds also available. Contact a Tsubaki representative for more information.
  • 4.Verify the required stroke.
    ※If the stroke exceeds 1.5 m, please contact us for a special type.
  • 5. Refer to the following to verify that the selected model satisfies the overhung load.

Verification of Allowable Overhung Load (OHL)

Lift Master can be easily selected by checking the lifting load and center of gravity position. As shown in the figure to the right, the allowable overhung load equals the point where the lift load intersects the center of gravity position.

See overhung load curves (ball screw type and trapezoidal screw type) for each model number.

Notes
  • ・When a load is applied to the arm, Lift Master should be expected to distort in the direction of the load and the arm tip should be expected to sink below horizontal. The amount of distortion not only increases with the longer stroke of Lift Master, but also affects the rigidity of the arm and mounting surface.
  • ・Fix LIFT MASTER upper end to reduce the arm bend or ZIP MASTER vibration.
  • ・Please contact us for details on the amount of distortion in the Lift Master.
The point where the lift load intersects the center of gravity position.

LMEB1000
(Workpiece mounting surface: Refer to outline dimensions )

OHL load curves

For LMEB1000

ex. 1 Center of gravity position = 500mm position → max. lift load = 9.80kN

ex. 2 Center of gravity position = 700mm position → max. lift load = 6.86kN

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