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ACRD602 Problem

Discussion in Racks, Rack Accessories, & Cooling started by Rami , 9 days ago
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  • rami_shama
    Rami
    Apprentice Apprentice
    Rami 9 days ago

    Hello,

    I found uncommon problem with my 3 units ACRD602P working as HACS.

    The Units stop cooling, and kept in ON and Backup mode, and shown that the Group cooling demand as 0kW, since the temperature in the Datacenter more than the usual and set point which it is 22C.

    I'm attaching the events log for the three units CB1, CB2, and CB3, and data log. in addition to report for the input voltage and Group maximum temperature report

    please find the attached

    you can go to the events; you will found that the problem occurs three times: at

    08/01/2019 2:17PM up to 3:33PM

    08/01/2019 9:37PM up to 10:45PM

    09/01/2019 8:51AM up to 10:01PM

  • L2SupportServices-Cooling
    L2SupportServices-Cooling
    =S= Representative
      This discussion is marked as answered
    L2SupportServices-Cooling 8 days ago (in response to Rami)

    Hello Rami. I recommend you call into your local tech support on this issue when you have access to all three of these units either over the web or from the front screen. This issue can be caused by a lot of different factors and may take some adjustments to the setup of the units which is better done over the phone.

    A couple of things to look at are: When in HACS mode the unit does not look at the Rack inlet sensor for the cooling demand. the unit is looking at the difference between the return air temperature and the supply air setpoint. It is waiting for the proper delta between these values (determined by your fan speed preference) to know when to turn on. Make sure there are no gaps between the equipment in the racks that will allow the server exhaust air to travel to the front of the rack without going through the cooling unit. If there are gaps this will heat up the rack inlet sensor and cause it to read high. We want all the server exhaust air to be returned to the cooling unit for the heat to be removed.

    I am only seeing a 15 kw load in the logs for the group. This is about the minimum amount of heat load to run one of these units. Ideally we would like some more heat load to keep the units running all the time. If you are still building out the room, when more servers are added, this will improve the performance of the cooling units. In the mean time, please call into your local tech support and they can help you change some settings to keep the units running better in the current environment. 

    Thank you

  • rami_shama
    Rami
    Apprentice Apprentice
    Rami 6 days ago (in response to L2SupportServices-Cooling)

    Dear Sir/Madam,

    I can get all the units configuration, and send them to you if you are interested.

    I'm contacting Schneider in Israel, but due to political issues, they can't access the Palestinian Territories. then we will try to solve it remotely.

    I made two units to run, because the room is big, please check the attached.

    you saw also that the cooling loads not exceeding 15kW, every one min the 2 units working for 2 min.

    Also I need your recommendation to connect at least one unit at UPS, because the electricity fails in the winter 2 times a day, so all the cooling units shutdown, what do you recommend? 

    Attachments
  • L2SupportServices-Cooling
    L2SupportServices-Cooling
    =S= Representative
    L2SupportServices-Cooling 4 days ago (in response to Rami)

    Hello Rami.

    We usually do not recommend putting DX units on UPS's. This is because the start up demands of the compressor will overload most UPS's unless the UPS is very over sized. This usually makes it impractical to buy a UPS that big. You can work wil the sales teams to find out a UPS that would work with the RD602 and see if it is practical for your situation.

    For the running of theses units, as mentioned before the load in the room is low for these units. The ideal fix would be to add more load to the room. This will keep the units on instead of cycling on and off. A few things you can do is to make sure there are no gaps in the server racks to help get the hot air back to the cooling units. Place blanking panels if there are any gaps in the racks. We can also try putting the units to Inrow mode. This will run off the rack inlet temps and may kick the units on quicker to keep those rack inlet temps from spiking.

    Thank you

  • rami_shama
    Rami
    Apprentice Apprentice
    Rami yesterday (in response to L2SupportServices-Cooling)

    Dear Sir,

    Thank you very much

    I Have 2  100kW UPSs with 15% load

    I can make two backup units of DX units, and make one working

    what is your opinion? 

  • rami_shama
    Rami
    Apprentice Apprentice
    Rami yesterday (in response to L2SupportServices-Cooling)

    Today the problem occurred once again, please check the attachments to have more information about the problem, also I get a screen shot for configuration and photos for the expansion tanks 

    Configuration files attached in RAR file 

  • L2SupportServices-Cooling
    L2SupportServices-Cooling
    =S= Representative
    L2SupportServices-Cooling 10 hours ago (in response to Rami)

    Hello Rami.

    From the data logs it looks like there are a couple of the rack inlet sensors that are picking up heat from outside sources. Check the placement of the sensors and make sure they are not picking up heat from servers. Also make sure that there are blanking panels installed in the server racks to make sure there is no exhaust air returning through gaps. For the configuration of the room, is there a HACS containment system installed or is it open to the room?

    For the question on using a UPS to power these units, I will have to direct you to the sales team to discuss. They will need to make sure your UPS can take the start up amperage of the cooling unit without getting overloaded on a circuit.

    Thank you

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