Star/delta connection CSD-U
Star/delta connection , General
Star/delta connections as standard-version with an additional transformer are used, if there is no neutral leader connected.
Star/delta connection for the protective start of the motor
The Condor Pressure Control GmbH C-SDU Star/delta connection offers, in due consideration of the relevant standards, the possibility of economically operating motors with a switching capacity greater than 4 kW using public mains networks.
With this 2-stage starter the inrush current (star circuit) is reduced by 1/3 of the height to be expected when starting the motor directly. The torque is equally reduced during start-up phase.
During the start-up phase (1 – 32 seconds), a special change-over relay with a contact switching time of 50 ms, guarantees reliable change over from star to delta operation.
During continuous operation, all motors connected to the Star/delta connection are protected by a manual motor starter with thermal and magnetic trip.
Standard executions contain a manual motor starter and an on / off switch for the control circuit. Complete star/delta connections additionally have a main circuit-breaker with enclosure locking, an emergency button, an hour meter and an operating LED.