Delta connection [t-head1-pg]

A delta connection allows the use of a soft starter with a lower rating than the motor it is used to control. Connected in series with each motor winding, the current the soft starter needs to supply is reduced by a factor of √3. This layout has the drawback that six motor supply cables are needed. Apart from that there are no restrictions. All soft starter functions remain available.

For this you have to connect the motor in delta and the voltage in this connection method must agree with the mains voltage. For 400 V mains voltage the motor must therefore be marked with 400 V/690 V.

Control section [t-head3]

Emergency-Stop

S1: Off

S2: On

Enable

Soft start/Soft stop

E2: Enable

T1: +thermistor

T2: –thermistor

DM4-340 Delta [t-head3]

Control voltage through Q1 or F1 or through Q2

See Control section

Motor current indication