Hi experts.
This isnt PLC related, but you guys are the best to ask anyway, so here goes...
You probably know the typical layout of a star-delta starter:
A short circuit protection before all contactors.
Then an overload protection after the main contactor (so that the current is monitored correctly during the star phase).
This layout is a little cumbersome. We would prefer to have two Circuit breakers, one before the main contactor, and one before the delta-contactor (see the attached diagram, it explains it much better).
The advantage is that we can have the normal arrangement with the supply bus connected to the circuit braker, in turn connected to the contactor(s), and again connected to the terminals etc.
We avoid to split up in a special YD motorstarter combination with separate short circuit and overload protections.
And there isnt much money to be saved using the "normal" layout.
My collegue asked me and newer having seen such an idea before I couldnt say that it is NOT a good idea. Are there any arguments against such a layout ?
[attachment]
This isnt PLC related, but you guys are the best to ask anyway, so here goes...
You probably know the typical layout of a star-delta starter:
A short circuit protection before all contactors.
Then an overload protection after the main contactor (so that the current is monitored correctly during the star phase).
This layout is a little cumbersome. We would prefer to have two Circuit breakers, one before the main contactor, and one before the delta-contactor (see the attached diagram, it explains it much better).
The advantage is that we can have the normal arrangement with the supply bus connected to the circuit braker, in turn connected to the contactor(s), and again connected to the terminals etc.
We avoid to split up in a special YD motorstarter combination with separate short circuit and overload protections.
And there isnt much money to be saved using the "normal" layout.
My collegue asked me and newer having seen such an idea before I couldnt say that it is NOT a good idea. Are there any arguments against such a layout ?
[attachment]