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  • Users: Hawkas
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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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??

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