Can I construct a Star Delta starter using Tesys U?

There is no published scheme for creating a star delta using Tesys U components but it can be created by the addition of some non Tesys U parts, contactors etc.

It is also possible to construct a reversing star delta using 2 Tesys U standalone reversing units (LU6MB0**) plus 2 additional contactors.

In both scenarios the Tesys U is upstream of the delta loop, therefore the maximum motor sizes are limited to 12A FLC and 32A FLC for LUB12 and LUB32 respectively.

Please see the attached documents for schematics of possible scheme.

Please note - These are functional schematic diagrams to illustrate how the control can be achieved. The installer remains responsible for ensuring all relevant local legislation and directives are met and that suitable circuit protection is provided.

Released for:Schneider Electric Ireland