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  • Users: ScottI2R
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  1. ScottI2R

    1746-NR8 RTD module failure?

    Hello all, We have a 2300V 1500hp Siemens motor Model:CGII frame:5812S that is giving us intermittent outer(rear) bearing temperature high faults. Now our control system monitors this and the trending I found showed temperature variations from a -328 degrees to 1562 degrees F. This was with...
  2. ScottI2R

    Is critical speed the same as natural resonance?

    I was wondering, and explaining to the wife what critical speeds are. We run multiple stage compressors and one of them always faults on a vibration fault at shutdown. I figure it is passing thru a critical speed during wind down. We can stop this monitoring in the ladder of the control, no...
  3. ScottI2R

    Adding nitrogen to Boiler

    Hi All, In my latest position with my company, I get to deal with some hot water boilers we use to heat chemical tanks. These run around 30-40 psi at 220-280 degrees F. I was told that we add 15-30 psi nitrogen into the supply lines to prevent the water from boiling into steam in the pipes...
  4. ScottI2R

    Motor / coupler / pump alignment vs. current draw

    Hi everyone, We recently had a coupler fail on a prelube pump for a 5 stage turbine air compressor. That style of coupler has been replaced with a lovejoy coupler. This pump is driven by a 1750 r/m 3ph. 5 HP 480V motor. No load, the motor draws 2.5 A/ phase. Loaded as it is now, it draws...
  5. ScottI2R

    Battery powered nuclear plant coolant pumps

    Hello everybody, In lieu of the disaster in Japan and the loss of power to the reactor coolant pumps, I have read that they are powering the pumps with batteries. While I am familiar with universal motors, I cannot fathom one of the size required to cool a reactor. Unless they are ac motors...
  6. ScottI2R

    Will an LCD be damaged in a vacuum oof less than 10 Torr?

    Hi Everyone, I would like to know if anyone has any experience with anything with an LCD display being exposed to a vacuum environment of between 5-8 Torr. Let me know if it can survive please. Thanks, Scott In a hundred years, it isn't going to matter anyway.
  7. ScottI2R

    Fuel consumption vs. RPM

    Hi all, Is it posible that an engine would get better fuel economy at a higher rpm as opposed to lower? My question, although it seems simpleton, is based upon my 95 eclipse. 85% highway driving for work. This vehicle appears to obtain better fuel economy in the 75-80mph range than the 60-65...
  8. ScottI2R

    DC Servo motor getting hot

    Hello all, I am in the process of finding a new servo amp for a dc brush "pancake" motor. The previous drive was a Kollmorgen kxa-175. These have been discontinued since Danaher Motion (the Carl Ichan of motion control) bought Kollmorgen. Sorry if i offend any Danaher people , but that was a bad...
  9. ScottI2R

    AB 9/240 series prog (PAL) change

    Hi all, I am tasked with having to change the PAL in one of these. Basically, I have to add a branch with --||-- on one rung. The problem is, I dont have the Offline Development S/W and when looking at the .obj file in notepad, it appears that the two "spare" inputs were never assigned. This...
  10. ScottI2R

    Curious about duct sizing

    Hi all, I have noticed in restaurants and bars (those with open ceilings) that the ducts that travel throughout go so far and then reduce in diameter for another distance, and, depending on the required length, they may reduce again. All the while having vent outlets either directly on them...
  11. ScottI2R

    Displacement on Demand / AFM could use info

    Hi All, I just rented a a new gm with the 3.9L with AFM. I would like some details on how this works in the valve and ignition systems. The transitions between 6 and 3 cylinder mode were not even noticable. Detailed links will work. I have found generalisations "solenoids on the lifters" on the...
  12. ScottI2R

    Futaba scale reesolution

    Does anyone know the resolution of a Futaba Pulscale linear encoder model SM305A? I have googled this to death and cannot find any data. I believe the "5" is for either 5 microns or 5 tenths of a thousandth but I am not sure. Any help will be appreciated. I need to spec a replacement. Thanks...
  13. ScottI2R

    LCD screen damage

    Hi, Can anyone tell me why a laptop screen that had been diagnosed as cracked, and showing black splotches, would return to full functionality with no noticable pixel damage? This occurred over the period of about a week. Thanks for any input, Scott In a hundred years, it isn't going to...
  14. ScottI2R

    PWM servo amp switching frequency

    Hi all, We have been currently driving a brushless DC servo with an amplifier that was recently obsoleted. This amp had a PWM switching freq. of 40 Khz. We MAY still be able to get a similar model that switches at 20 Khz. What I would like to know is 1) How critical is this switching frequency...
  15. ScottI2R

    Keylock with dead Battery

    Hi all, I had an experience with a Hummer H2 recently. If someone can give me a clue as to the design of this problem. And it appears that it IS designed in. Upon returning to the airport parking lot after being gone for a long weekend (Superbowl 2004, remember the Janet Jackson episode). My H2...
  16. ScottI2R

    AB 1747-AIC Failures

    Hi All, I just heard from a customer of ours that has been having multiple 1747-aic failures. This system links SLC501 to AIC 1 then straight to AIC 2 and out to the PV550's dh-485 port. More often than not, it is the coupler on the PV550's end that fails. I have them checking grounding and...
  17. ScottI2R

    BCD thumbswitch replacement

    Hi all, OK, I got caught doing nothing @ work so it has been suggested (again) that I look into replacing the BCD thumb switches that we have been using (reliably I might add) for 20 years! In short, we gang 3 and 4, 0-9 bcd thumb switches together. Effectively allowing a range from 0-199 on the...
  18. ScottI2R

    More energy efficient to run a pool filter @ 220 than 110V?

    HI Everyone, I received a phone call from my Boss last night and he needed the formula for power. OK, easy enough. However, he told me of how he had his pool filter motor changed over ($190.00) to 220V instead of 110V he was using. My math says the power consumption is ALMOST the same. EG) 110V...
  19. ScottI2R

    compressor temperature

    Hi all, I have an old kegerator (vintage 1950-55) that is not cooling as well as it used to. It cannot cool below about 52F with an ambient temp of 87F. I noticed a lot of ice surrounding the little copper tube yesterday so I unplugged and defrosted the unit. After defrost, the inside temp was...
  20. ScottI2R

    Naval AC power

    Hi again all, After talking with a few co-workers that were in the US Navy, I have learned that on board ship, a whole lot of the equipment used was powered by 400Hz ac. I was wondering why. Can anybody help? BTW, one guy was an EWO, man, I couldn't believe some of the unclassified "techspecs"...

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