Power-jacks C-Series Manual do Utilizador descarregar pdf (Página 20)

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Operation5

5.2.28 Connecting Screw Jacks in Series

The number of screw jacks that can be connected in series is limited by input torque

requirements on the rst worm shaft in the line. For the C-Series the torque on the worm shaft

of the rst screw jack should not exceed 300% of its rated full load torque (this does not include

the 200kN screw jacks which are rated at 200%).

5.2.29 Efciency of a Multiple Screw Jack System

In addition to individual device efciencies, the efciency of the screw jack arrangement must

be taken into consideration. The arrangement efciency allows for misalignment due to slight

deformation of the structure under load, for the losses in couplings, bearings, and for a normal

amount of misalignment in positioning the screw jacks and gearboxes. For efciency values

consult Power Jacks product literature or engineers.

5.2.30 Screw Jack Fitted with 3rd Party Accessories

If your screw jack is tted with a device not manufactured by Power Jacks then please consult

the provided manual for this device.

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Power-jacks C-Series Manual do Utilizador Página 20