frequency | Page 4

frequency

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  1. E

    Frequency of tests.

    Hi all, what will be the frequency of testing for fixed equipment as stated in cop? It has stationery but not fixed items ie hand dryers?Also what exactly do they mean by initial frequency. Is this the first test after purchase.If so when is the next insp required??Last thing my supernova...
  2. M

    Frequency of PAT Testing.

    I have been asked the question, regarding the frequency of PAT testing computers. The specific question being this, computers are required at a given frequency. Now some computers are in a communial area ie library and some in an office. Is there any difference to the frequency of a computer...
  3. A

    How to change Frequency on a Fronius IGTL 4.0

    Hi I've been given approval in principal to install a 3.99kWp system providing that the upper frequency limit of the protection relay is set to 51.5Hz has anyone got any ideas how to do this ?
  4. K

    School/commercial kitchen electrics testing frequency

    Hi there, 1st post :D Does anyone have any guidance on the following scenario please with regard mains electrical testing frequencies. We know that educational establishments should have their mains electrics inspected and tested every 5 years, however does anyone know about the frequency...
  5. S

    Do voltage convertors convert cycles?

    Hi, Im waiting for a machine from China to arrive to Canada, and here is my question, machine will be 220V 50Hz, and currently in Canada its 110V 60Hz, so most converters i can find in Canada have no problem doing 110V > 220V, but it seems they all give 60Hz anyways, is there a way to convert...
  6. 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...
  7. 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...
  8. 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...
  9. P

    Periodic frequency question

    Hey up,Im wondering what the recomended time for next inspection is where there have been code 2 defects?Cheers
  10. 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...
  11. S

    Relationship between frequency and phase angle

    Does the phase angle between two voltages varies with frequency? Please explain their relationship
  12. 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...
  13. 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.
  14. 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...
  15. 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?
  16. 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...
  17. 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...
  18. 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...

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