Page number 6
Application Design Recommendations | 6 Risk Management As a leading manufacturer of actuator systems for the healthcare industry, LINAK always performs evaluations of risks related to using LINAK components in final medical equipment. The LINAK system handles most potential risks that can lead to unintended movement of an actuator system in case of error. The remaining residual risks, that must be evaluated and handled by the application manufacturer, are presented in generic documents divided into product groups: Actuators, Lifting Columns, Control Boxes, Controls, Accessories and Batteries. These generic documents are named 'Disclosed information for safety and significant risks' and can be requested by contacting your usual LINAK sales contact. Edition 2 | 2024-10-15
Page number 7
Application Design Recommendations Actuators and columns | 7 Load Safety nut Safety factor The nominal load stated on the actuator label is the dynamic load that the product is designed to lift/push/pull. If this load has been exceeded either dynamic or static, the product is allowed to fail in a safe way. Actuators can be fitted with a safety nut. This is an auxillary nut, moving with the main nut and supporting the load if the main nut breaks down. When the safety nut is active, the actuator will continue to function but only in the specified direction of the safety nut. An actuator with a safety nut fitted in push mode will only have the protection of the safety nut in a push application. Actuators with a safety nut in push mode will often be used for patient lifts and beds. The safety nut fitted in push mode can be supplied with many different types of LINAK actuators (see the different actuator ordering examples). The safety factor is stated in the data sheet. The safety factor is a static load. Example of safety factor on an actuator with push 10,000 N/pull 2,000 N. Safety factor test: 1 hour with static load (incl. safety factor) - Actuator fully extracted - No collapse is allowed, but drifting inwards/outwards is accepted Safety factor test is 1 x 1 hour. Actuator fully extracted. Static constant load. No collapse allowed, inward movement is acceptable. Edition 2 | 2024-10-15
