Star-Delta starter connection of motors
Motor manufacturers have different ways of marking the nameplate, but the information should be there.Two voltages with the proper ratio and an indication of star (or y) and delta should be marked. The low voltage is the running voltage and the high voltage is 1.732 times the low voltage. When you start, the low voltage is applied to the high voltage connection. That limits the starting current and the starting torque. Here is a nameplate example: