Star delta issue (driving me insane)

[GSGFaw]

If you get the commercial distribution catalogue from here:

Hager Brochures, Catalogues & Documentations | Hager UK

Discover all the product documentation you need in our brochures & catalogues! Download what you need in one click straight from Hager Official website!

hager.com

The details are on page 112 for section "Transformers & Motors Protection". The 'NCN' column is their C-curve MCB, the NDN the D-curve.

While that doesn't explain why the old starters don't trip the C type, it at least gives me supporting evidence that a C type 32A isn't a reliable supply option.
All the HPUs have been fully refurbished and so COULD be a little "tight" for a while (pure speculation, but makes sense)

 

[davesparks]

Yes, I have said the same to my work but, and it is frustrating, it comes back to "why don't the old star delta panels trip?"

Was the old panel protected by the same MCB?

 

[mainline]

What Fluke mode is that? I have found clamp meters with "max hold" often don't record short spikes, and you only need a few ms of enough current to trip the magnetic side of a MCB.

He needs one of these bad boys.

https://www.farnell.com/datasheets/1965966.pdf

 

[Petej999]

Most motor where I work are covered by D type can you swap for one of them to try ?

Agree surprised at some of the replies though

 

[DPG]

Agree surprised at some of the replies though

In his original post he mentions D types.

 

[GSGFaw]

Thanks for the various suggestions. I eventually had narrowed it down to an issue with the contactors and changed them out for Schneider LC1D type (from ABB AF type) and the issue immediately went away.
After speaking to ABB techinical they said that I was not the first report of this issue and that the AF contactors will only work reliably with their own star delta timer (since they moved to AF range. The old A contactors work fine with any timer). Now my issue is the 2 control supplies available are 415Vac or 12Vdc, neither of which are covered by the ABB timers.
Bizarre, but I canb't argue that the change to Schneider contactors has 100% fixed the issue.

 

[James]

The contactors are available at 400v coil as well

 

[GSGFaw]

View attachment 109051The contactors are available at 400v coil as well

Yeah, I've now got all that but with the electronic timer. The ABB AF contactors aren't compatible with the Schneider SD timer, but ABB don't do a 12Vdc version, so I had to use the Schneider