1. 9 units of LA27 actuators were reported to make noise in the application, did not make noise outside the application. In your test rig, we heard noises, which were determined to be due to mis-alignment. The conclusion is that the noise is caused by the actuators being forced into a non-linear movement. The good news is they did not seem to have a problem outside the application, and once the mis-alignment is controlled, there is no problem. To ascertain this, we will carry out an analysis of the actuators, and provide you with a report. This report will be finalized after we receive the actuators. Kindly notice these actuators will not be returned, as the actuators can not be assembled after the analysis
2. 4 units of LA27 actuators were reported to have failed. The worm wheels were found to be damaged, caused by either overload, collision with the extension tube, or other external causes. Overload is difficult to avoid if a heavy patient or several people use the bed, as the analogue control box due to cost reasons does not contain a thermal fuse, unlike the OpenBus control boxes. Collision with the extension tube is a known issue we have observed before, and my guess is the corrective action taken by you would not account for older beds in the market?
3. 8 units of LA27 were reported to have been noisy or faulty, but when testing, no faults were found
4. 10 units of LA27 were reported to be faulty, and the inspection revealed the piston rod eyes of the actuators have been turned. This indicates the actuators may have been turned by mistake during mounting, or that heavy misalignment over an extended period of time has disengaged the motor (which is still working) from the gear. This issue is related to the misalignment issue described in point 1.
A way to solve the misalignment should be discussed, if there is a chance to scrutinize the beds in which the above actuators were mounted. It would be an advantage to look at several beds, in order to get an understanding for the issue in general.