Converting spray booth from 3phase tp 240v

[minimutly]

Contactor 1 (on the left) feeds a 3 ph load, looks like a flexible four core with black wires. (9A on 3 phase is a fair load ...)
Contactor 2 (next one along) feeds the grey brown and black cable. both at the top of the box.
Contactor 3 just feeds two phases (415V) to something that has been disconnected, again at the top.
You wouldn't normally feed a burner with its own control system via an overload, unless the control for the burner is done at the same time.
You wouldn't run a burner on two phase either, so I dunno what was on those two. BTW, that 2 phase is on seperate mcb's, very naughty, if one trips you have the other phase all over the load as well as coming back into the panel. They should be grouped/linked or whatever its called.

 

[carbon]

You wouldn't run a burner on two phase either, so I dunno what was on those two. BTW, that 2 phase is on seperate mcb's, very naughty, if one trips you have the other phase all over the load as well as coming back into the panel. They should be grouped/linked or whatever its called.

As they are different value mcb’s I assume they are spreading the load of the single phase parts of the booth over the three phases rather than loading just one phase

 

[minimutly]

As they are different value mcb’s I assume they are spreading the load of the single phase parts of the booth over the three phases rather than loading just one phase

Sorry, don't see that at all, there is no return path - they are "sending out" 415V, on 10A mcbs.

 

[carbon]

I’m still only looking at this on my phone. So may be missing some of it through scrolling the picture. Could they not use the neutral connections on the left side of the din rail terminals next to the earth terminals as it looks like only two are currently connected

 

[bert]

One of the motors and the lights are not yet connected up so may be the missing wires.

Converter cost is £3k so converting to 240v motors is less than £500 for the motors and fitting/wiring if possible

 

[bert]

Cost wise 2 (thought there were 3 fans initially) inverters at £200 a pop, plus the work to fit and set up.
Or, buy some single phase motors and fit to the fans, again £200 a pop, plus a bit less time to mod the panel.
A lot cheaper than a phase converter (which would likely not be happy with the off/on nature of the loads.
what are the brown cores at top left? Lights?

So are you saying we could fit a converter for each fan motor inline and everything else on the cabinet is 240v? Fan motors are currently both 3kW 3 phase

 

[minimutly]

So are you saying we could fit a converter for each fan motor inline and everything else on the cabinet is 240v? Fan motors are currently both 3kW 3 phase

Yes, but you will have to take out the 3 phase circuits and convert to single phase wiring - bigger contactors, or one each for the convertors, with the overloads done away with, or changed and used to trigger a fault to stop the convertors. (I would do away with them, the loads are only fans, pretty much a known load rating).
Price up 3.5kW inverters first job. Then find out where that burner is connected. I'd also want to know what the diff. Pressure switch is doing...
The other thing to do is check on the full load amps of everything, add them up and see if that is within the rating of the supply wiring and the main isolator switch. A 3 kW motor on 3 phase uses a lot less amps than s 3kW inverter on single phase. If the sum is too much for the panel wiring I would supply the inverters seperately, but use the panel pictured to control the inverters. Sounds a lot harder than it would be to do.