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Electronic motor starters and drives
Connection examples, DM4 |
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| Delta connection |
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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.
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Control section
 Emergency-Stop
S1: Off
S2: On
Enable
Soft start/Soft stop
E2: Enable
T1: +thermistor
T2: –thermistor |
DM4-340 Delta |
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Control voltage through Q1 or F1 or through Q2
See Control section
Motor current indication |
