How do I optimise the trigger behaviour of SERVO-DRIVE flex?

How do I optimise the trigger behaviour of SERVO-DRIVE flex?

This picture shows the SERVO-DRIVE flexWith SERVO-DRIVE flex, refrigerators, freezers and dishwashers open especially easily with electrical support. If the front gap, bumper or drive unit are not correctly adjusted and/or installed, the doors may not open properly. Read the following article to find out how to solve this problem.

 

 

 

 

  1. Check that all four edges of the front gap are 2.6 mm.

This picture shows the front gap

  1. Check that the bumpers are in place and are assembled correctly. Make sure that the bumpers are sprung (moveable).

This picture shows a bumper

This picture shows the position of the bumpers

  1. If there are two SERVO-DRIVE flex units installed for opening the same doors, please check the following:
  • Are the SERVO-DRIVE flex units positioned correctly?
    The units must be positioned so that one is at the top and one is at the bottom of the refrigerator. The units should not be positioned directly next to each other/on top of each other.

This picture shows two SERVO-DRIVE flex units

  •   Are the two units synchronised with one another?This picture shows two synchronized SERVO-DRIVE flex units
    You can find more about the synchronisation of two units here.
  • Are both units supplied by the same power source?

This picture shows the power source of two SERVO-DRIVE flex

  1. Check the installation position of the SERVO-DRIVE flex mounting plate.

This picture shows the SERVO-DRIVE flex mounting plate

This picture shows the position of the mounting plate

  1. Check whether the catch plate is installed.

This picture shows a catch plate

 

Have you checked all five steps and your refrigerator doors are still not triggering properly?
If so, please find the detailed assembly steps (as PDF and video) in the following link.

Have any more questions? Then please write a comment below this article. We would be very happy to provide further assistance.

 

How do I optimise the trigger behaviour of SERVO-DRIVE flex?
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23 thoughts on “How do I optimise the trigger behaviour of SERVO-DRIVE flex?

  • July 21, 2020 at 8:23
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    Our servo drive flex was working well, then the power was cut and afterwards it no longer works as well as it used to (not reliably, sometimes works, sometimes doesn’t- doesn’t push as far as it used to). Is there a known reason for this?

    • July 21, 2020 at 11:54
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      Hi John,
      it would be new to me that a power cut has an effect on the SERVO-DRIVE flex behaviour.
      Have you already tried to reset the reference run?
      This can be done by firmly pushing the rod towards the housing for around 3 seconds. The reset of the reference run will be confirmed by the rod driving out of the housing once.
      After that, close the fridge door, push it once and then the door will automatically open and close 5 times (= reference run). Please do not interrupt the reference run manually. During these 5 motion cycles the unit will learn about the force it has to emit to open the door.

      I hope this helps, otherwise please get in touch with our local customer service (http://www.blum.com/contact) to narrow down the issue.

      After the troubleshooting, if we know the exact reason for this misbehaviour, we can re-post it as an answer to your query here.

      Best regards
      Matthias

    • August 12, 2020 at 7:06
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      Hi John,

      thank you for your reply via email.
      I am happy to hear that the reset of the reference run has solved the issue.

      Best regards
      Matthias

  • August 31, 2020 at 12:12
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    Hi,

    Our servo drive was working fine, but now when you push the fridge door it opens but then closes instantly. Please advise us what we should do to correct this.

    James

    • August 31, 2020 at 13:34
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      Hi James,
      have you tried to reset the reference run?
      This can be done by firmly pushing the rod inside the housing for ca. 3 seconds. The reset gets confirmed by the rod moving out of the housing once.
      Then close the fridge door and push it once. The reference run will open and close the fridge door 5 times in a row. Please do not interrupt this automatic opening and closing cycle.

      If SERVO-DRIVE flex still does not work properly after the reset of the reference run, please get in touch with your local Blum representation office. The contact data is found here: http://www.blum.com/contact
      They will most probably ask for a video to learn more about a potential malfunction and will assist you with the troubleshooting process.

      Best regards
      Matthias

  • September 27, 2020 at 22:16
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    Hi,

    Our servo drive Flex on our fridge has malfunctioned lately. It takes 2-4 presses to get it to open automatically. It was installed 4 years ago. I have tried to reset it by pressing the rod 3 seconds, afterwards it confirms by moving out of the house and the in again. After closing the door and pushing it open once, it closes again, but only once, not 5 times as expected. Hence, it seems impossible to reset it. How to fix?

    Best,
    Peter

    • September 28, 2020 at 7:23
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      Hi Peter,
      if the reference run does not finish properly, there might be mainly two reasons. One is, that the sealing lip of the fridge is too strong and SERVO-DRIVE flex can not emitt enough force to open it, or that the installation tolerances exceed the built-in tolerance compensation of SERVO-DRIVE flex.
      As it has worked properly for years, I suspect it might rather be the second option. Wooden fridge/freezer doors start bending with time as they are fixed to a fridge door with different material properties. As a result, the front gap might become too large or, if no bumpers are used or positioned in a wrong manner, at some points become too small. In addition, if the steel catchplate has not been installed, this might have an additional effect.
      Accordingly, it will be best to get in touch directly with you to troubleshoot this. Most probably, my colleagues will request a video of the SERVO-DRIVE unit movements, the fridge brand and type and some pictures of the installation situation (inside of the door to see wether there have been bumpers installed, and other properties).

      Best regards
      Matthias

  • October 13, 2020 at 11:53
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    Hi,
    Our servo drive flex on the fridge is working fine most of the time, but a couple of times per day when it is opened, the rod retracts very quickly (rather than sticking out for 3/4 seconds as usual) and it is followed by a short series of beeps. We cannot work out what is causing this or if it is an error message. The mechanism seems to be working fine on fridge other than that. Are you able to help? Separately, do you know if there is a way to change how long the rod stays sticking out after opening? On some occasions, if we need to access the fridge for a short amount of time, it remains sticking out and the fridge door bangs on it when closing.
    Many thanks.

    • October 13, 2020 at 13:26
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      Hi Georgia,
      SERVO-DRIVE flex does not emit any audio signals. Also, the rod retracts immediately as soon as the fridge door is opened. I am quite sure that you have a solution of a different manufacturer, not Blum, which stays outside for the adjusted time and won’t retract automatically.
      As far as I know, in order to adjust the time of how long the rod sticks out, you’d have to remove the whole fridge from the cabinet, to access the mechanism of this manufacturer.

      I will get in touch with you by email so that we can verify this with a photo of the unit.

      Best regards
      Matthias

  • December 6, 2020 at 13:40
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    Our servo-drive flex system mounted on the fridge doesn’t work properly anymore. We need to press very firmly a couple of times to open the door. The past 2 years it worked seamless.
    I just tried the reset, but it only works on the lower flex, not on the upper one. Also, if I now press on the upper half of the door; it requires multiple strong pushes for the system to open. If it then opens, both flex rods come out.
    If I press on the lower half of the door, it immediately opens and I don’t need to use much force. However, only the lower flex rod comes out; and the upper ones stays in.

    How can I ensure that both flex rods work together again? And what could cause the upper flex system not being able to reset?

    • December 7, 2020 at 16:28
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      Hi Arjan,
      first of all, thank you very much for the comprehensive error description. Indeed, it is sometimes possible that with time, the trigger behaviour might change a little bit, as fridge doors tend to start bending slightly over time (this is completely normal actually). In such a case, resetting SERVO-DRIVE flex and performing a new reference run would do the job as that way SERVO-DRIVE flex learns about the new position of the closed door and can compensate tolerances by itself.
      What I can not explain is why triggering the upper SERVO-DRIVE flex makes both units move (like it should when the units are synchronised) but triggering the lower one would only make the lower unit move. That is, to my mind, a sign that the upper SERVO-DRIVE flex thinks that the door is not even closed. That would be another reason for a new reference run which is, in your case, not even possible as the unit can not be resetted.
      You see, troubleshooting this case using the comments in the blog might be a challenge.
      Therefore, I would like to forward this case to our representatives in your country and they will assist you directly with the troubleshooting process.
      They will also check if all Blum bumpers are in the right place, if the assembly position of SERVO-DRIVE flex is correct, and other.

      Best regards
      Matthias

  • February 7, 2021 at 11:38
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    Hi Matthias,

    I got my 3 servo drives installed 2 days ago. One of the stoped working now (fridge door). The other 2 drivers works fine. The driver can not be reset. I tried to push it in for 3-5 seconds, but nothing happens. The pin is dead. I have checked there is a power going to the driver. Any ideas what can I do now?

    Thanks in advance
    Stan

    • February 8, 2021 at 7:37
      Permalink

      Hi Stan,

      if the SERVO-DRIVE unit can not be reset, I suspect that there might be no connection to the power supply.
      Are all SD units connected to the same power supply? Are some SD units synchronised and using individual power supplies or are the eventually synchronised units connected to the same power supply (which is mandatory)? Have you checked the connection node which connects the black SD flex power cable with the power supply cable if there are any pins missing, bent or broken in any other way? Resetting the unit can be a little bit challenging, as you have to push the rod quite firmly, but not too firm as the “confirmation movement” might then be blocked by your finger.

      There are a couple of other things that can be checked, which is why I have informed my colleagues in the UK to get in touch with you directly. They have the option to video-assist you with the troubleshooting process, which is more straightforward in this case I think 🙂

      Best regards from Austria
      Matthias

  • February 21, 2021 at 8:26
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    Hi Matthias,
    Yesterday the carpenter installed our cabinets and placed 2 servo drives flex for fridge and freezer (opening separately). We wanted to test the units before assembling the sliding door mechanism in case something doesn’t work. We are unable to trigger the reference run on either of the Flex’s. They have power, because the reset works fine. Everything is installed according to the manual. The only difference is that the front panel is not yet attached to the fridge door.

    Any ideas on how to proceed?

    • February 22, 2021 at 7:21
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      Hi Hanne,
      the reference run only works with a door attached. If you were able to reset the reference run, assuring that the units have power, the units work.
      During the reference run (opening and closing cycle of 5 times) the unit detects wether it is a sliding or fixed door, a damped or undamped hinge, the strenght of the sealing lip, installation tolerance compensation, etc.
      Accordingly, the reference run only makes sense with the door attached anyway ?

      I hope this helps, otherwise please let me know.

      Best regards
      Matthias

  • June 30, 2021 at 19:17
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    we have just had two servos installed. one on the fridge one on the freezer. the freezer servo opens for about 3 seconds but the fridge opens for barely 1-2 seconds at most and it will catch our fingers if we are not quick enough. i am concerned for my children – how do we adjust the servo so it remains open for much longer.

    • July 1, 2021 at 12:27
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      Hi Neil,
      thank you for your message. Troubleshooting this case using the comments in the blog might be a challenge. Therefore, I would like to forward this case to our Blum representatives in your country and they will assist you directly with the troubleshooting process.
      Best regards
      Andrea

  • September 21, 2021 at 8:46
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    I have a single flex servo installed for my fridge. It was regulated so i needed to push at least 3 times for the door to open. Considering it is not very practical i asked to the installer to have it regulated in order to open it at my 1st press. Now it opens as soon as the 1st press, but when i open or close another kitchen cabinet on its left, it also trigger the flex and opens the fridge. We tried to move the catch plate a bit placing some washers, and also reset the system for a new regulation, but the problem won’t fix. Do you have any suggestion?

    • September 21, 2021 at 14:39
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      Hi Nicola,

      I suspect that some kind of vacuum-effect triggers SERVO-DRIVE flex when the neighbouring cabinet is opened/closed. SERVO-DRIVE gets triggered as soon as the front gets “pushed” towards the cabinet side. Is it possible that there are no spring bumpers installed? Or is it possible that the neighbouring front slightly touches the fridge front? Basically we’d have to find a way to stop the front from slightly moving when the neighbouring cabinet is opened. If nothing helps, please get in touch with our technical specialists directly. You find the contact info here: http://www.blum.com/contact We will be happy to try to narrow down the issue further.

      Greets from Austria
      Matthias

  • September 30, 2021 at 6:05
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    How Is Servo Drive Flex working if it is run out of electricity for couple of hours? because of blackout?

    • September 30, 2021 at 11:05
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      Hi Gasper,
      if I get your point correctly, the answer is: As soon as the power is back on, SERVO-DRIVE flex will work properly again.
      Of course, during the power-out, there is no function and you would have to open the door manually.

      Best regards
      Matthias

  • October 5, 2021 at 9:45
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    Hi Matthias,

    I’ve just bought a kitchen with 2x Servo Drive Flex for a build-in fridge (one i the top and one in the bottom). However, they don’t seem to work properly as it takes 5 seconds for both of them to activate. I have to press the rods in for 5 seconds before they ‘shoot out’.
    Is there a way to adjust this?

    Regards,
    Carl

    • October 5, 2021 at 10:30
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      Hi Carl,

      I’ve never seen this kind of behaviour and there is certainly no way to adjust SERVO-DRIVE flex. Only a reset of the reference run which is necessary if the fridge/freezer has been replaced, adjusted, or if the closing forces / sealing lip have changed over time.
      Is there only a UNO-transformer in use (only suitable for one unit at a time) instead of a 24W transformer which will work with two units? Is the assembly position of the SD flex units correct?
      Are the units synchronised properly using the white synchro cable in the back? Are you sure that not one of the synchro cables has been mistakenly connected to the power source? Are all Blum spring bumpers installed in the correct place on the cabinet front to assure the necessary front gap of 2.6mm for a proper release behaviour?

      To my mind it would be best if you spoke with one of our technical specialists. That way it is easier to send videos or pictures of the installation situation.
      Your case has been forwarded and a specialist will get in touch with you soon.

      Best regards
      Matthias

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