Permissible inrush current single phase

Hi

I have had the misfortune to buy a Lincat Combination Oven for my Hotel.

These normally come in 10kw three phase.  3 x  13amps That's not too bad.

I have the single phase version 1 x 39 amps. Not so good.

It is operating at 1 second on 39 amps

                          0.2 second off  0 amps

                          Cycling continually. for hours.

I have a 40kva single phase supply and can hear the current hammering away incessantly. Lights flickering etc. I asked the manufacture for details of soft starting

and duty cycle. They say this is the way they were designed to work. Bang on and Bang off --1 second cycle continually.

I don't have a current (Hee Hee)  Reg book. So I ask is there a reg in place that covers the single phase load criteria.

To add insult to injury-- I have a three phase 65kva standby set.-- I would not put that destructive abuse on one of my 20kva phases.

it would shake it apart. So I cannot run it.

Regards -- Tony

Parents
  • Have you had a look in the oven terminal box?

    Often these things are actually the same physical oven with just links to configure it for three phase or single phase supply.

    You might be able to convert it back to 3 x 13A which would make its use on your 3 phase 65kVA set more palatable?

    As an aside... when you say "40kVA single phase supply" do you mean 40kVA from the grid or a 40kVA Genset?

Reply
  • Have you had a look in the oven terminal box?

    Often these things are actually the same physical oven with just links to configure it for three phase or single phase supply.

    You might be able to convert it back to 3 x 13A which would make its use on your 3 phase 65kVA set more palatable?

    As an aside... when you say "40kVA single phase supply" do you mean 40kVA from the grid or a 40kVA Genset?

Children
  • Hi Adrian. Thanks for that.

    My first question was about inrush current allowed in the UK. It just doesn't look right for electronically controlled gear. The One second pulsing is a problem. 

    I can't put a spanner on it -as it is under warrentee.

    They have sent  "TECHS" out five times and changed half the sensors for cooking operation issues --without success. 

    The mains are single phase -I have 50kva MD allowed.  I built a hybrid changeover to bring in my ---65 kva 3 phase standby genset on line. 

    Regards  Tony