(Newbie) Rotary Phase Converter problems

[moonman5]

Hi All,

This is my first post, I hope you can help.

I have a single to three phase Rotary phase converter (12 Kw) I am about to connect the converter to my milling machine
before this I thought I would do some voltage output checks from the 3 phase lines L1/L2/L3.

Now I have to admit to not being to knolledgeable on 3 phase (more confident with single phase) so I am a bit puzzled as
to why the Rotary phase converter is putting out the voltages listed below?

Nuetral to L1=210 Volts
Nuetral to L2=420 Volts?
Nuetral to L3=240 Volts

Is L2 to high? I thought that the 3 phases should be equal? I know that Rotary converters give out a "wild leg" but this seems odd?

I also checked across the phases and got the following:

L1 to L2=480 Volts
L2 to L3=520 Volts
L1 to L3=450 Volts

I am now a bit reluctant to connect the converter to my machine in case I do any damage?

I would be greatfull for any help