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Allight light tower

Discussion in 'Generators/Gensets' started by Mark250, May 4, 2020.

  1. Mark250

    Mark250 Senior Member

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    Hi,guys I really could use some help please, I have a Allight MS 7.5K-9 lighting tower and I need an electrical schematic please. the lighting plant is 240V 40hz
    Can I run 240V single phase and 415 three phase off this unit? if so do I need to change or configure the AVR
    The alternator is set up for 240Vsingle phase at the moment.
    Alternator details off the id plates
    Brand- Leroy Somer
    Rating Plate info
    voltage 415V
    Phase 3
    KVA 20
    KW 16
    Amp 27.8
    information plate
    LSA 42.2s5 j 6/4
    S/n 037562 052
    Date 2011 .07
    RPM 1500
    hz 50
    P/F .8
    AVR R250 shunt
    exit. values
    full load 30.5 V/1.29 amps
    no load 0.53 amps
    Thanks for any help
    Mark
     
  2. Birken Vogt

    Birken Vogt Charter Member

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    Grass Valley, Ca
    https://www.leroy-somer.com/documentation_pdf/3433_en.pdf

    Reference page 5 and 7 for the reconnections you want assuming all 12 wires are present in the connection box.

    If you set it up as a series wye connection you will have 240 volts line to neutral and 416 line to line with three phases available.
     
  3. Mark250

    Mark250 Senior Member

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    Thanks Birken,
    I hope this is not a stupid question but do I need to do anything with the AVO and can I use 240 and 415 at the same time
     
  4. Mark250

    Mark250 Senior Member

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    is this the one?
    excuse my ignorance here
    what does it mean where it lists winding 6,7 and 8?
    so for 240V I am assuming N to which line 1,2 or 3 or doesn't it matter
    for 415V use lines 1,2 and 3
    what is the difference between the R250 and R438?
    Thanks again for your help


    upload_2020-5-5_5-38-0.png
     
  5. Birken Vogt

    Birken Vogt Charter Member

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    You have the R250 apparently, it is on your data plate.

    You have winding type 6 which is at the end there of the 6/4, reference page 4.

    On page 5 you can see the R250 vs the R438, the R438 gets its power from auxiliary windings while the R250 gets its power from the main winding only.

    It looks like on the new configuration you are supposed to connect the R250 inputs between T8 and T11. I would want to know where it is connected right now and how all the 12 wires are connected together, before making any changes.

    240 volts from any line to neutral. Try to balance them out as well as you can. 415 volts from L1/2/3 to any other L1/2/3. Again try to balance them.
     
  6. Mark250

    Mark250 Senior Member

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    Thanks Birken I have taken the top cover off the alternator and taken some pictures
    hopefully I can figure it out
    I did notice the there is a current limiting reactor connected between neutral and ground with a current sensor connected to a rh99m protection relay
    will that cause me any issues?
     
  7. Birken Vogt

    Birken Vogt Charter Member

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    I don't know about the RCD, we don't see them much in the USA. It says max 240 volts on the spec sheet but I am not sure if that means 240V to neutral or line to line.
     
  8. Mark250

    Mark250 Senior Member

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    Ok, thanks again