DK Digital CDB-700 Manual do Utilizador descarregar pdf (Página 38)

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Recommendations:

• LA31 with brake. An LA31 brake in a push application brakes actively when the actuator moves in an inward direction. The same applies to an

actuator mounted with a brake in a pull direction. It brakes in an outward direction. Under this condition the standard motor uses up to 4 Amp.

and the fast motor uses up to 6 Amp. (Measured after 5 cycles at normal room temperature).

Therefore if the LA31 with brake is used together with a CB7 it is important that the current cut-off limit of the control box is higher than the used

Amp. i.e. not lower than 4 Amp.

LA31 with brake cannot be combined with CB9/CB7 with emergency lowering. For all LA31 actuators with brake self-locking ability up to max.

load it is only possible in one direction: push or pull.

• The LA31 actuator must not be exposed to more than 4000 N in pull. In applications where misalignments may occur the normal back fixture can

take max. 1500 N in pull whereas the flexible back fixture can take up to 4000 N in pull. The actuator must be mounted at right angles (90º) to

it is fixing/load (max.1.5º deviation)

Max. load and safety factor of 2.5 according to EN60601-1:

• 6000 N is only possible from S = 0 - 250 mm stroke

• Only max. load of 4000N from S = 250 - 350 mm stroke. See details on later pages.

• Stroke above S> 350 mm is to be treated as a special article, please contact LINAK A/S.

Warning!

• If the actuator does not work as described above, the risk of injury due to squeezing can arise. Therefore, the actuator must immediately be sent

for service at the nearest, authorised LINAK workshop.

• 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.

• Bowden cable cover must click twice, in order to be locked sufﬁciently

• Do not sideload the actuator

• Inspect the actuator minimum once a year for wear and jarring sound

• If an LA31 is used in an application where there are repeated dynamic (push/pull) movements in the area 2000 – 4000 N, then it is necessary to

contact LINAK A/S in order to make a correct speciﬁcation of the actuator. Repeated push/pull movements cause extra strain to the actuator and

can give safety considerations, the consequence being possible damage to the actuator.

LA31 actuators for patient hoists are marked with a label to ensure the user is aware that it is not permitted to handle the patient hoist

by pulling the actuator or otherwise expose it to side forces.

LA31 with mechanical end stop - a ﬁrst failure safe option:

In many applications our customers have approvals according to EN 60601-1.

The typical applications can be beds, massage couches etc.

In the norm, EN 60601-1, it is mentioned that the application must be ﬁrst failure safe.

The manufacturer is responsible for making a risk analysis in order to check this. If a risk is identiﬁed it is the manufacturer of the application who

makes sure that the risk is eliminated.

Normally the result of this risk analysis will state that the end stop switch in the LA31 would be questioned: Is this switch ﬁrst failure safe?

The answer to this will be: No, a switch cannot be ﬁrst failure safe. - In practical life we have discovered only very few defect switches.

Ask the customer: - What was the result of your risk analysis when you achieved the EN 60601-1 approval on your application?

There are several ways that an application can be made ﬁrst failure safe:

• Use a mechanical stop in the application

• Use of a mechanical end stop in LA31 - is a possible option.

• Use an SLS (safety limit switch) in connection with the actuator.

• Or a longer installation dimension.

As a special solution we can offer LA31 with mechanical end stop with the same installation dimension as a standard LA31.

Contact LINAK A/S for further information if you need this solution.

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DK Digital CDB-700 Manual do Utilizador Página 38

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