DK Digital CDB-700 Instrukcja Użytkownika Pobierz pdf (Strona 33)

Page 33 of 108

The LA27 actuator is a powerful actuator designed for applications such as furniture

and care beds.

Built-in end-stop circuit (CS27)

In the LA27/CS27 the actuator is switched off at the end position. There is no overload

protection.

• The LA27CS27 has no IP classiﬁcation and is connected to a HB71 or HB72.

The power supply is the TR6 or TR7.

It is important that the supply voltage 24 VDC is connected correctly (see Figure 6.7)

otherwise the CS-circuit may be destroyed.

Mechanical spline:

The splines function 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.

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.

Quick Release:

The LA27 with QR is designed to be used as a part of the backrest function in a Care/Hospital bed. The QR function allows a patient to be lowered

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

Functional test of QR:

To test a LA27QR it is necesarry to have the actuator built into an application. The release cable has to be provided and mounted by the customer.

The necesarry force on the cable requiered to operate the Quick Release is approx. 20 kg. The necesarry force on the actuator to operate the quick

release is approx. 50 kg. Wenn operating the QR, it is recommended that the QR is activated all the way down.

Usage:

• Duty cycle: 2/18; 2 minutes continuous use followed by 18 minutes not in use

• Duty cycle: Max 5% or 1 min. continuous use followed by 19 minutes not in use - with 8000 N version.

• Lifetime limited to only 3000 cycles according to EN1970 - with 8000 N version

• Ambient temperature: +5

to +40

C (the actuator must also be at this temp.)

• Approvals: LA27 is approved according to the 3rd edition of IEC 60601-1, ANSI/AAMI ES 60601-1 and CAN/CSA C-22.2 No. 60601-1

NOTE: re. LA27 with 6.000N specification (274x3xxx1xxx0xZ; Z = A or B with worm shaft*) for OpenBus™: I.e. to use such combination a

preceding test MUST be carried out.

This combination reduces the self-lock ability because of lower friction from the worm shaft which has a rolled axle. The worm shaft is however

needed because of the OpenBus™ output power.

The problem related to an application:

The self-lock ability may be reduced in cases where the load curve is 6.000 N in both minimum and maximum stroke length.

4. LA27 (MEDLINE

CARELINE

HOMELINE

)

Warning!

• The actuator must not be used in pull applications when the quick release is activated, as the risk of personal injury can arise.

• Do only use the actuator within specified working limits.

• Do not sideload the actuator.

Recommendations:

• LA27 is not meant to have CB6S OBL/OBF mounted on the actuator. The CB6S OBL/OBF must be mounted separately using a bracket.

• LA27 must have a minimum installation dimension of 320 mm if control box CB6 is to be mounted on the actuator.

• The cable for the LA27 is not part of the actuator therefore it must be ordered separately.

• Piston rod eye: The distance from the centre of the eye, to the end of the actuator.

• Change between push and pull not allowed

• Inspect actuator once a year, for wear and jarring sound.

• We recommend using a safety nut in medical applications

• Do not expose actuators without all cables fitted to water/cleaning.

• No thread on bolt inside back fixture.

Note:

For CB6 the current will be cut off when the total current on all channels reaches approx. 5.1 to 5.4 Amp. This means that when two LA27´s running

simultaneously are connected to a CB6 they will not be able to lift the max. load mentioned under technical specifications.

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