Saf OPAL SS6 User Manual download pdf (Page 12)

OPAL SS6 Reduced Voltage Starters

Page 5

1.2.3.3 Other Types of AC Motors

OPAL starters may also be used to start 2-speed motors with multiple windings or

connections. Proper contactor selection and sequencing is required for the specific motor.

1.2.3.4 Resistive and Inductive Loads

The TRU-START is well suited for use as a phase controller or current regulator on resistive

or inductive loads such as heaters. When applied with a Temperature PI controller, the TRU-

START will maintain smooth control to avoid the overheating associated with on/off type

controllers. Improved temperature accuracy and longer heater element life can be expected

over standard control methods.

1.2.4 STARTING AC MOTORS IN PARALLEL

OPAL SS6 starters can be used to start motors in parallel but they must have individual

overload devices added.

When the paralleled motors are also connected to the same load, mechanically or through the

material, then load sharing must be considered.

When the motors are mechanically tied, the load sharing is determined by how closely the

motor characteristics are to each other. It is important to keep the motors exactly the same.

Even changing the manufacturers of the motors can cause some variations in load sharing.

The OPAL size is determined by the total of the motor current ratings.

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Saf OPAL SS6 User Manual Page 12