Similar to the 12 leads star (wye) configuration, the 12 leads delta configuration is also made available for dual voltage application. It is designed to operate with a selection of wiring configuration for a variation of source voltage ratings for both high and low voltage operation.
The rated operational voltage designed for the motor is determined from the motor's nameplate. Whenever in doubt, a detailed wiring information for each designated voltages designed for the motor's operation is also provided on the nameplate, or alternatively, wiring configuration for specific voltage operation can also be found on the cover of the motor's terminal box.
Each of the rated voltage values intended for the motor's operation requires different methodology of wiring connection in order to run the motor in either low or high voltage operation. The electrical drawings shown below illustrates a standard 12 leads wiring connection for induction motors rated with dual voltage functionality in delta configuration.
|Fig-1: 12 Leads 3 Phase High Volts Delta Connected Wiring Configuration|
|Fig-2: 12 Leads 3 Phase Low Volts Delta Connected Wiring Configuration|
Another variation of wiring configuration for a 12 leads motor connection apart from the 12 leads delta connection is the 12 leads star (wye) configuration.