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  1. #1
    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    4,340

    McQuay Starter Problem

    I have a new building with a AGS175CH27-ER10. Yesterday morning I walked into a 85 degree building. Friday night they had some crazy storms roll through. It tripped out the chw pumps vfd's, a bunch of starters for exhuast fans and fan coils, and the one chiller.

    So circuit 1 is tripped on low evap and circuit 2 is tripped on starter fault. Find the starter on 2 with a "51" code, which is "Current Sensor Offset Fault". To be honest don't know what that is.......so I ohm out the current sensors and they all read 11.1 ohms. So I hit the reset on the starter board. Won't reset. So I go to the Microtech and reset all alarms. Circuit 1 starts up, but circuit 2 is still showing starter fault and starter board still in fault. So I pull 120v from the starter board and reapply. Starter now says "Ready". But Microtech still showing starter fault. So I power down chiller and reboot everything. Both circuits come on.

    The problem is circuit 2 is not showing any amperages or voltages on it's Mircotech controller. Circuit 1 is showing everything. So I verify voltages and amperages are ok. Mess around some more, but can't get that 2nd circuit to show voltages or amperages.

    I'm thinking there is a problem with the serial card on the Microtech controller. Anyone else?

    BTW- The only thing I could get off the starter was AGS/WGS D3 RVSS. It's a solid state starter w/ communications. There is nothing in the manual for it and I couldn't find a seperate manual for it.

  2. #2
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,596
    We have some ags210's with those staters on it and I'm pretty sure we have the books in the machine. I'll try to get by there tomorrow and let you know.

    I was able to find some info and some flow charts in imm ags-2 on page 63.

  3. #3
    Join Date
    Sep 2006
    Location
    Southern Maryland
    Posts
    11
    Benshaw, say's when you get a "51" code you need a new D3 board for that starter.
    The D3 card is defective. need to call McQuay.

  4. #4
    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    4,340
    Quote Originally Posted by abctech1 View Post
    Benshaw, say's when you get a "51" code you need a new D3 board for that starter.
    The D3 card is defective. need to call McQuay.
    You don't happen to have any service literature on the Benshaw starters?

    I haven't had a chance to get back over there to take another look. The excessive heat has had me else where. And the chiller is currently running both circuits. But it would nice to armed with some more info. The stuff I have from McQuay doesn't really get into the starters. And code 51 it basically says nothing.

  5. #5
    you need a new D3 card, and you will need to program it

  6. #6
    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    4,340
    Quote Originally Posted by ascj View Post
    The problem is circuit 2 is not showing any amperages or voltages on it's Mircotech controller. Circuit 1 is showing everything. So I verify voltages and amperages are ok. Mess around some more, but can't get that 2nd circuit to show voltages or amperages.

    I'm thinking there is a problem with the serial card on the Microtech controller. Anyone else?
    Finally got some time on the chiller today. Found modbus address went back to default. Re programed address, everything is showing now.

  7. #7
    Join Date
    Sep 2011
    Location
    Heartland
    Posts
    25
    Quote Originally Posted by ascj View Post
    You don't happen to have any service literature on the Benshaw starters?

    I haven't had a chance to get back over there to take another look. The excessive heat has had me else where. And the chiller is currently running both circuits. But it would nice to armed with some more info. The stuff I have from McQuay doesn't really get into the starters. And code 51 it basically says nothing.
    With the exception of the compressor teardown manuals, McQuay does not have service literature in print. The only way to get that information is to go to their schools and take lots of notes.
    The IOM has a flowchart for troubleshooting the starter, but it would have failed to identify your problem.

  8. #8
    Join Date
    Aug 2007
    Location
    northern new jersey
    Posts
    19
    I have problems with the Benshaw starters on a few of our Mcquay screw chillers. Sometimes once a month, sometimes once a week I find a "starter fault" alarm message. The literature that Mcquay sent us does not match the starter parameters at all. I wish I knew how to remedy a "bypass contactor fault on stop" fault code F48. The chillers are old, but have low hours and everything including the starters are in nearly new condition...Any ideas ? Can anyone find service info on the Benshaw Starters ? The voltages/phases at the site are correct and checked by the onsite electricians...only one compressor on each of the chillers shuts down on this alarm...the other chillers and equiptment runs fine, and the operating pressures, temps, oil levels and oil pressures on all very similar to the compressors that run good...even the starter parameters are the same. Any ideas ? Thanks.

  9. #9
    Join Date
    May 2011
    Location
    Spring City, Pennsylvania, United States
    Posts
    191
    Quote Originally Posted by Slipkot511 View Post
    With the exception of the compressor teardown manuals, McQuay does not have service literature in print. The only way to get that information is to go to their schools and take lots of notes.
    The IOM has a flowchart for troubleshooting the starter, but it would have failed to identify your problem.
    That's not entirely true...this link has helped me out a few times

    http://www.mcquay.com/McQuay/Literature/Literature

  10. #10
    Join Date
    Sep 2011
    Location
    Heartland
    Posts
    25
    Which model of screw are you having this problem with? What vintage starter? Do you have the newer D3 card (has a red reset button by the LED display)... Or the older card w/o modbus capability. (no reset button, have to hold down 2 buttons simultaneously to reset)?

  11. #11
    Join Date
    Aug 2007
    Location
    northern new jersey
    Posts
    19
    Hey Slipkot, I have the newer type of card with the little reset button. I'll run out to my truck later and get the chiller model/serial if you'd like. Thanks

  12. #12
    Join Date
    Sep 2011
    Location
    Heartland
    Posts
    25
    Theres only two different ones for the screws. So the model doesn't matter. I'm out today, but I'll send you the correct documentation later.
    That fault basically means the CTs are sensing current after 115v was removed from the start input.

  13. #13
    Join Date
    Sep 2011
    Location
    Heartland
    Posts
    25
    I can't send you anything since you don't have your e-mail in profile.(but it sounds like you already have the correct quick start for that card). Your best bet is to call Benshaw tech support @ 800-203-2416. I have found them to be extremely helpful. Not sure if they will talk to you since you aren't an OEM, but it's worth a try. You will need to have the serial number of the starter. It will be on a white Benshaw tag inside the cabinet door. The serial should start with "S200" or similar. Be sure to tell them you have McQuay code in the starter as it is different than an off the shelf card.
    I've never had to deal with that particular fault, but it's been my experience that often the fault has has nothing to do with the fault description.

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