frequency

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  1. J

    Boiler/Generator problem

    Hi I’m trying to run a gas combi boiler from a 2500kva petrol generator, but the boiler shuts down when connected to the generator displaying a supply problem. In the boiler house I have 2 separate sockets one coupled to the domestic supply the other one a direct feed from the generator, the...
    • jude
    • Thread
    • boiler electricians' talk frequency generator problem roman supply times
    • Replies: 2
    • Forum: Talk Electrician Forum
  2. S

    voltage to frequency

    I need to design a linear R to F converter ,I'm able to change Resis. to volt. linearly but I can't continue ,I tried to make it with the linear VCO but it didn't work in pspice schematic even if I plot it exactly as it's here : LINEAR VCO - Circuit Diagram - Forum - SeekIC.com the VCO in...
  3. A

    Hertz And Volts?

    After Greetings suppose that you have light works on (240 vac and 50 hz) and machine works on (240 vac and 50 hz) I need to know what will happen for each of (light and machine) if 1- the volts increase 2- the volts decrease 3- the hertz increase 4- the hertz decrease Thanks Best regards...
  4. P

    Periodic frequency question

    Hey up,Im wondering what the recomended time for next inspection is where there have been code 2 defects?Cheers
  5. G

    Mains frequency effect on cookers

    I live in the UAE and purchased a cooker here, which I would now like to send to the Philippines. However, there is a difference in mains frequency between the two countries, and I'm worried that the cooker may not work in the Philippines, or only work dangerously. According to Wikipedia...
    • gdi2k
    • Thread
    • aus cooker effect electricians' talk frequency mains motors replacement
    • Replies: 8
    • Forum: Australia
  6. S

    Relationship between frequency and phase angle

    Does the phase angle between two voltages varies with frequency? Please explain their relationship
  7. S

    RCD Testing Frequency

    Hi guys, Can anyone point me in the direction of a regulation etc for the frequency of RCD testing? We have power poles in the offices we look after and they have integral RCD's, but they never get tested, i need something i can take to my Manager and say look this is what we must do and...
  8. T

    maximum frequency on a 50Hz rated motor

    I have an application where I want to fit an invertor to a 3 phase 50Hz squirrel cage motor in order to increase the speed. Is there a rule of thumb that determines the maximum frequency before problems occur with the motor-overheating etc.
  9. R

    High frequency emergency light fittings

    Hi, i have been asked to replace some faulty emergency light fittings, only the faulty ones but leaving the existing working ones. the fittings i am replacing with are not the same manufacturer and they are high frequency, but im not sure whether the existing ones are! if they are not and i...
    • Ridgey88
    • Thread
    • aus electricians' talk emergency fittings frequency light light fittings
    • Replies: 1
    • Forum: Australia
  10. P

    Help: Motor and frequency

    Hello All. If I have motor with frequency 50HZ, 415V and I want to operate it on frequency 60HZ, 415V Or If I have motor with frequency 60HZ, 415V and I want to operate it on frequency 50HZ, 415V What will be the effect of the motor?
  11. M

    Working out Impediance need help!

    Hey I am trying to do this formula but I can't work out the last number to get answer the bit I can't do is the 10-6 to get the answer. frequency of 1 KHZ 2x3.142x1000 x220x10-6 - = 723.4ohms Frequency 20 KHZ 2x3.142x20000x220x10-9 = 36.2ohms Can anyone describe how to do the last...
  12. S

    wireless light switching

    Got a small problem i've recently wired a large and expensive kitchen for a client who has now request some lighting above a larder area on the opposite side of the kitchen to the pelmet lights ive already installed on the other side. Does anyone know of a wireless transmitter that i could use...
    • Strickers
    • Thread
    • aus electricians' talk frequency kitchen light lights other switch switching wireless
    • Replies: 3
    • Forum: Australia
  13. S

    Static Frequency Converter(SFC)

    Please tell that how SFC work? What I know is that first of aLL AC voltage is converted into DC voltage through rectifier bridge then DC is converted back to AC of desired frequency using inverters. Now what I know that converter/inverter simply change AC/DC voltage. How they change frequency...
    • speedtronic
    • Thread
    • electricians' talk frequency static
    • Replies: 8
    • Forum: Talk Electrician Forum
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