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Type: Posts; User: vas

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  1. Replies
    10
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    801

    Thank all for your kind responses, I had solved...

    Thank all for your kind responses, I had solved the problem. A third party system I/O module is faulty and cause the signal error. Thank again...
  2. Replies
    10
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    801

    Thank everyone for yours kind advise, I will just...

    Thank everyone for yours kind advise, I will just try everything to get it right. How do I rectify it if the gnd is not =?
  3. Replies
    10
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    801

    Thank you... You give me a very good lead.

    Thank you... You give me a very good lead.
  4. Replies
    10
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    801

    I do not know the brand of the source controller...

    I do not know the brand of the source controller but we are using different power source. I am using DDC is Carel PCO-3 and I used a meter to confirm the signal voltage is 0-10vdc when disconnect...
  5. Replies
    10
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    801

    0-10vdc Signal Problem

    Dear All,

    I have encounter a problem a need some advise. My DDC received a 0-10vdc signal for a temperature set-point, The temp set-point signal is set at 5vdc when not connect to my DDC but the...
  6. Replies
    2
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    852

    Hot Standby Redundancy PLC/DDC

    Hi All,

    Currently i have a project that required to use hot standby redundancy PLC, which i think it overkill on my equipment as it is a standalone dehumidifier system.

    I like to ask have...
  7. Replies
    1
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    850

    Chilled water valves and actuator selection

    Hi,

    Is it possible to select the chilled water valve and actuator by using ahu coil water flow rate? i have a data of 107.63 l/s but cannot get upstream and downstream pressure from them. :gah:
    ...
  8. Replies
    1
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    1,232

    How to convert NTC sensor to NTC 20K sensor

    Hi All,

    I am using Carel NTC temperature sensor for my system and HW need to read the temperature when my unit is down but somehow they cannot get the correct reading bcos they software can only...
  9. Replies
    3
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    473

    what i mean is a hot standby redundancy...

    what i mean is a hot standby redundancy controller.
  10. Replies
    3
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    473

    Carel redundancy pCO

    Hi all,

    Does anyone here have any idea whether that carel have any redundancy pCO? i had check with the sale person but haven't get any reply yet. just wanna try my luck whether anyone had done it...
  11. Replies
    26
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    5,498

    The compressor have a VFD & the comm wire is...

    The compressor have a VFD & the comm wire is using 18 AWG shielded cable. Most possible is the network wire that pick up the interference.
  12. Replies
    26
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    5,498

    Lon-work FTT-10 interference

    Hi everyone, i need help from u guys.

    My equipment is a third party unit and using lon-work FTT-10 as HLI with the BMS. My problem is when my compressor is activated, it will affect the whole...
  13. Thread: Need Help

    by vas
    Replies
    4
    Views
    505

    Need Help

    Please kindly check for me whether which company carries temperature and humidity sensors, which are to be used in hazardous area. The specifications are as below. I would be greatly appreciative for...
  14. Replies
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    2,735

    Thank everyone the the info. Currently my company...

    Thank everyone the the info. Currently my company is using carel pCO controller. we using Lonwork & Modbus high level interface for most of our project. My company is in asia (Singapore) and we are...
  15. Replies
    7
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    2,735

    Looking for new DDC controller

    Hi everyone,

    My company wanted to try other brands DDC controller to replace our current DDC controller. Any recommandation??

    Rgds,

    Vas
  16. Replies
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    853

    Yes. because my offcoil is at 12degC even when my...

    Yes. because my offcoil is at 12degC even when my signal for the valve is 0v.
    I tried to close the hand valve on my chilled pipe & my offcoil temperature went up to 21degC. that is how i know the...
  17. Replies
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    853

    I dunno? But i tot 2000N is strong enough to...

    I dunno? But i tot 2000N is strong enough to close the actuator valve with chilled water oni at 55psi. cos i tried a siemens actuator with only 1600N and it can fully closed with the pressure is...
  18. Replies
    8
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    853

    It move to 100% position when i give out 10vdc...

    It move to 100% position when i give out 10vdc signal and stuck in 30% open position when i give 0vdc signal. But my staff siad it sometime won't move at all when they test it again.
  19. Replies
    8
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    853

    My Chw modulating valve cannot fully close

    Hi guy,

    I'm using a Belimo "AV24-MFT2" actuatuor with 2000N. :eek: My problem is it can't fully close when my signal output is 0Vdc. The chilled water supply pressure is only 55psi & 50psi for...
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