Dual Voltage Motors
Some, but not all, dual voltage motors may be used for part winding starting. The manufacturer should be contacted before an attempt is made to use a dual voltage motor in this application. Delta connected dual voltage motors are not acceptable for part winding starting. When dual voltage motors are used, the motor must be operated on the low voltage setting of the motor. A 240/480 volt motor, for example, could only be operated on 240 volts. A dual voltage motor connection is shown in Figure 40 – 3. Motor terminal leads T4, T5, and T6 are connected together forming a separate wye connection for the motor.
Motor Applications
Part winding starting is typically used for motors that supply the moving force for centrifugal pumps, fans, and blowers. They are often found in air conditioning and refrigeration applications. They are not generally employed to start heavy inertia loads that require an excessive amount of starting time.