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  • Users: kallileo
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  1. kallileo

    RCBO tripping on generator

    I have 3ph, 400V, 9kVA, 3000rpm air cooled generator on a trailer supplying a 3ph cooling unit (3phase compressor 2,2kW, 2 single phase fans around 0,2kW each and a 0,1kW single phase agitation motor) on the same trailer. I have installed a 4 pole RCBO, TYPE A, 10A, 30mA and bonded neutral and...
  2. kallileo

    Transformer for small DC Pump

    I have a 100W, 24VDC pump which I want to drive using an ssr and supply through a 230/24VAC transformer and a bridge rectifier. I have made a circuit using an AC SSR to supply/cut power to the transformer primary in order to turn on/off the pump. I have also installed a 1,25A fast blow fuse on...
  3. kallileo

    Grounding the secondary of a small transformer

    We have a small 230V device placed in a metal housing. We are going to display in an exibithion in US and in order not to modify it for 110V, we decided to use a 400VA 110V/230V transformer. Is it nessecary to ground the secondary of the transformer for safety reasons?
  4. kallileo

    Mains voltage in US

    Our company manufactures pasteurizers and we want to make a US version. The standard european version uses 230V for the control circuit and 400V for the 3ph heater. Now we want to make a sample 120V/208V, 60Hz version. Live and neutral will be used to get 120V and the voltage between 2 phases is...
  5. kallileo

    MCB after or before relay

    Usually an MCB or fuse is place before the relay. What will change I place first the relay and after that the MCB like in diagram B?
  6. kallileo

    AC Line filtering

    I have installed a magnetostrictive level system on a tank in a farm and I have some problems. Since the voltage on the farms isn't stable and bad filtered during the milking when all the motors are on I get errors on the controller of the sensor. Possible cause is that the power noise isn't...
  7. kallileo

    1ph or 3ph VFD selection

    I have a small agitation motor with the following charateristics: 230/400V 3ph50Hz 0.42/0.24A 100RPM Input Power 0,14W It will be used to agitate condensed milk in a vertical 400l tank. I will use a Schneider VFD to control the speed between 30-100RPM. The single phase ATV12 mode is 50%...
  8. kallileo

    Transformer output line protection

    I have 230VAC to 24Vac 60VA transformer which is used to supply voltage to a coil of a valve 43VA and some contactor coils. The same transformer is also suppling voltage to the coils of 3-4 contactors which are located in another panel 5-6 meters away from the transformer. I'm thinking of...
  9. kallileo

    Thermal relay calculation for single phase motor

    Hi, I have a 3ph motor with the following specs: 230/400V3~ 50Hz 0.48/0.28A cosΦ = 0,8 Some times we use permanent capacitor and use single phase voltage to run the motor. Is it possible to calculate the current without measuring it in order to set the thermay relay accordingly? Thanks Leonidas

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