Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. Hawkas

    NXP 89LPC936

    The TSSOP package still seems to be available, however it's the PLCC 28 that we need. I've tried to find a sales contact link to NXP but can't seem to find one. Contacting NXP direct is the only thing I haven't done. Thanks for the help.
  2. Hawkas

    NXP 89LPC936

    Hoping someone may be able to help. My Company has been using the NXP 89LPC936 PLCC28 programmable micro for a number of years, and it's only recently when we tried to re-order that we have discovered that they are a discontinued item. This leaves us in a position of not being able to produce...
  3. Hawkas

    Circuit Breaker Selection

    I have a situation where I have a sub-circuit control box protected by a 20A 3 pole circuit breaker. Within the control box are 1 x 10A 3 pole circuit breaker, and 1 x 6A single pole circuit breaker. The problem we are having is that the 20A circuit breaker trips at random times, however the...
  4. Hawkas

    Cummins LT100 Transfer Switch

    Thanks for that, the installation manual is reasonably clear about setting the pots, so I will go to site next week and look at those things you mentioned, thanks a lot for the help.
  5. Hawkas

    Cummins LT100 Transfer Switch

    The only LED that comes on is the "Start" LED, no matter what source is connected. The customer lost his manuals and we just got a replacement installation manual from Cummins (which took about two months!!). There are no drawings of the control board in the manual, I guess we needed a service...
  6. Hawkas

    Cummins LT100 Transfer Switch

    No the emergency contactor does not energize. The ATS is an LT100, 415VAC, Three Phase Three Wire, with Control Package B. The LED indicators from top to bottom are "Stop Timing", "XFR Timing", "Re-XFR Timing", "XFR", "Re-XFR", "Norm Avail", "Emer Avail", & "Start"
  7. Hawkas

    Cummins LT100 Transfer Switch

    Does anyone have any experience with this LT100 range of transfer switches. When the system is powered up the mains contactor does not energise, and the emergency contactor remains de-energized as well. The only indication on the control board is the red "Start" LED which lights up but nothing...
  8. Hawkas

    Function of Motor Start Capacitor

    The motor isn't an instant reverse type, the direction of the motor is controlled by separate forward and reverse contactors, which are electrically interlocked via the N/C auxiliary on the opposite contactor. Whatever direction the motor happens to be travelling in, when the control system...
  9. Hawkas

    Function of Motor Start Capacitor

    No I'm talking about manually operating the limit switch while it is moving in one direction or another to simulate the standard operation. The motor is controlling a shade screen in a greenhouse. At night the screen covers the house to keep the heat inside. In the morning the control system...
  10. Hawkas

    Function of Motor Start Capacitor

    The limit switches drop out the forward or reverse contactors, so when the limit switch is activated all power is removed from the motor. Its just when the limit switch is de-activated and the contactor comes back in, the motor will not re-start in the same direction. It will however run in the...
  11. Hawkas

    Function of Motor Start Capacitor

    I have a small 240VAC motor which I believe has a faulty start cap. When the motor is first started it runs fine, but when it it stopped via a separate control limit switch and the contactor drops out, if the limit switch is closed again the contactor will re-energise but the motor will not...
  12. Hawkas

    Motor Start & Run Capacitor Duty Cycles

    I have had a 240VAC motor that has blown up two sets of Start & Run capacitors in the last three months. The motor has a 20 seconds on 20 seconds off duty cycle when it is triggered, and this cycle could be on for 4 to 5 minutes. Is this short duty cycle likely to be the cause of the capacitor...
  13. Hawkas

    Contactor Overload Trip Curves

    Thankyou both very much,
  14. Hawkas

    Contactor Overload Trip Curves

    Do contactor thermal overloads have the same type of trip curve characteristics as circuit breakers. And if so, how do you specify this, and is this information generally printed on overload labels??

Part and Inventory Search

Back
Top