DK Digital CDB-700 Instrukcja Użytkownika Pobierz pdf (Strona 37)

Page 37 of 108

9. LA31 (CARELINE

TECHLINE

HOMELINE

DESKLINE

)

The LA31 actuator is a very quiet and powerful actuator designed for a variety of

applications such as furniture, care, or hospital beds.

The standard LA31 actuator is available for both the HOMELINE, CARELINE, TECHLINE

and DESKLINE

product ranges.

Reed-switch:

The Reed-switch gives a number of pulses for each rotation of the motor. These pulses

are used to calculate the piston rod’s position as well as to control several actuators

running in parallel.

Your nearest LINAK dealer can inform the number of pulses per stroke length.

Regarding Reed-switch connection, see Figure 6.10.

Usage

• Duty cycle: Max 10% or 2 minutes continuous use followed by 18 minutes not in use.

• Ambient temperature: + 5° to + 40°C

• The CARELINE system has full compliance with EN 60601-1

Hall

The Hall principle is very similar to the Reed principle. A Hall sensor is based on a magnet that rotates. Two hall sensors are placed close to the

magnet ﬁeld. The control box (CB20/CB6S OBF/CB16 OBF/CBD4/CBD5) can detect whenever the magnetic ﬁeld changes direction. The two Hall-

sensors are placed close to each other, but with a small displacement. This distance leads to a timing difference between the two pulses. Whichever

one of them comes ﬁrst indicates the direction of movement. Therefore, there will be no error summary (as with the reed-switch) Hall is therefore a

very precise system. Hall is not suitable for use in quick release actuators. see ﬁgure 10.

Built-in end-stop circuit

In the actuators mentioned the end-stop switch is part of the actuator construction. Each time the actuator reaches end-stop position, the switch is

activated and the current is cut off. In addition to the end-stop switch, we also recommend a mechanical end stop function as an additional safety

option for applications where it will be necessary.

External Quick Release

The quick release function is placed in the piston rod end, in which a wrappedspring clutch can be loosened by means of turning the spring housing

either by the handle or a cable. Hereafter, the inner tube can turn freely and due to the pressure on the piston rod end from the application, the inner

tube will rotate and thus screw itself downwards.

Internal Quick Release:

The LA31 with Quick Release is designed to be used as a part of the backrest function in a Care/Hospital bed. The Quick Release function allowes a

patient to be lowered manually to a ﬂat position very quickly (CPR) in case of an emergency.

New version of Quick Release (Internal Quick Release).

The new version of the Quick Release is integrated in the clutch of the LA31. It operates by way of a release cable that is pulled. Hereafter, the clutch

is declutched and the spindle can turn freely. Due to the pressure on the piston rod end from the application, the spindle will rotate thus moving

the actuator inwards. Due to this new version the LA31 actuator can keep its standard installation dimension and has a protection class up to IPX6

washable.

The Quick Release is e.g. used for emergency lowering of the headrest part of a bed.

Functional test of QR:

To test a LA31QR it is necesarry to have the actuator built into an application. The release cable has to be provided and mounted by the customer.

The necessary force on the cable requiered to operate the Quick release is approx. 5 kg. The necessary force on the actuator to operate the Quick

Release is approx. 50 kg. When operating the Quick Release, it is recommended that the Quick Release is activated all the way down.

Mechanical spline:

The splines functions so that the actuator can only push, not pull. During pull in the actuator, the inner tube is lifted off the thread bush, and the

actuator can therefore never pull a load, only push. See ﬁgure 8.

Functional test of mechanical splines:

When the piston rod is at the innermost position, it must be possible to pull it out manually to its full travel length and to press it in again without

much resistance and without using the motor. If this is not possible, contact your nearest LINAK dealer.

...to be continued

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