VD test failure

Sorry you are having so many problems with your Version 8 machines. You are aware that effective Dec 31, 2023, the Version 8.3 or less goes End of Life. Which means if a part is no longer in stock, there will be no back orders placed.

Now on to your problem. The VD test failure is performed to ensure the VD valve is closed before treatment is allowed to begin. The VD valve is exercised by the Controller (Open/Close), but it is the Supervisor signal that monitors whether the valve is opened or closed, because it is a mechanical function. The Supervisor signal is the small opto-device sitting next to the VD motor. The VANE or FLAG of the motor must sit fully into the sensor to block the light. If the flag is not positioned onto the motor shaft properly, it may rotate to the close position but then bounce back, allowing IR light to pass through. The motor must be in the fully closed position and the flag properly positioned to block the IR signal.

NOTE: there is a new digital motor, that requires the new digital control board. The control board is black versus the green Analog board. If you need to order a new motor (sticking or binding and not rotating properly) be sure you order the correct pair.

Lastly, there are connector pins, wiring harness inspection and connectors on the LLS. In this case, the LLS would be the main choice, because it is a Supervisor signal that determines the status.

It is not as simple as you may think. If a part is needed now, and it is not in stock in the US, a request will be made to Germany for it. If they have it, they will ship it. After Dec 31, 2023, if the part is not available, no back order will be created. The letter was to allow customers to plan for the future. NOTE: some parts are already not available in Germany and because the machines were declared EOL, they are not ordering replacement stock.

hello! i ad a similar issue just now.staff is saying that it is failing VD. checked the flag on motor operation is fine. however when going into test 1.14 PFVVB is showing stuck open, any ideas? I am still new and not sure what PFVVB is. Version 9.1B
thanks!

<biomedfanboy> Not really. You are in test mode, and sometimes, depending on the Software platform of your machine, or build level (software can be changed), disinfect stepper motors would sometimes fail to pass the test on the floor just prior to putting the patient on. A solution to this was a redesign of the VD assembly, and then, a complete change from an analog controlled system to a digital controlled system for more precise control. If you have a true 9.1B, check the VD valve controller board color. If green, it it analog. If black, it is digital.

What happens with the analog control is sometimes the drive to the motor doesn't turn off fast enough, causing the motor to bounce when it hits the end of motion. That bounce moves the flag a few mm down from its full stop position, allowing some infrared light to pass across the photosensor.

SrCusEngr

Sorry for the super late reply. But wanted to incase anyone else has the issue. Ended up having a second machine come in with the same symptoms. Took to the jira site and was told to try and rebuild. so after parts came in I rebuilt both. I saw some slight dark colored fluid on one but other than that they looked fine. However, that fixed both VD failures. (important to note the direction of the middle screw, i had to flip it around on one)