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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.
• 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.
Warning
• 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.
• 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 not be used in pull applications when the Quick Release is activated, as the risk of personal injury can arise.
• Bowden cable must click twice, in order to be locket sufficiently.
• Do not sideload the actuator.
• Inspect the actuator minimum once a year for wear and jarring sound.
• If a 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 consideration, 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 manual lowering
The purpose of the ML (Manual Lowering) is in case of a power failure, to be able to mechanically lower a patient by turning the ML part in the
clockwise direction until the actuator is fully lowered.
Recommendations:
• An addition of 35 mm to installation dimension compared to standard (with spline)
• Only for push applications
• Use spline actuators
• Cannot be retro fitted
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