Frequently Asked Technical Questions - Single Phase range

How does EVASAVE work?

In simple terms Evasave works firstly by Soft Starting the motor, then Optimising the running of the motor by matching motor torque to load torque by sensing the motors load, and reducing the motors terminal voltage to a level where the motor produces the correct torque requirement for the driven load. This has the effect of reducing the motors iron (magnetising) losses (Kvar) and saving energy.

Can Evasave be fitted too more than one motor at a time?

No. The Evasave range can only control a single motor load.

Which types of motor can benefit from Evasave?

• Single phase shaded pole motors.
• Split phase motors.
• Split phase capacitor start motors.

What are the parameters for energy saving?

As with three phase motors the motor should run for around 8 hours per day. On most single phase motors the on load and off load currents can be nearly identical due to the motors inefficiency. Therefor it can be difficult to assess the amount of energy that can be saved on a particular application. Other than monitoring the load cycle on the application savings can only be established by monitoring actual motor power factor or by trial and error.

Which types of motor cannot benefit from Evasave?

Evasave cannot be fitted to the following types of motor:

• Any DC Motor
• Universal Motors, that is motors fitted with a commutator and brushes.
• Stepper Motors.

Will Evasave meet the CE directives?

Yes, Evasave meets both the EMC and Low Voltage directives

What happens if Evasave fails?

In the rare circumstances of unit failure, Evasave will fail safe, this means that the unit will pass full voltage to the motor and the full functions of the motor will be retained.

What is the present range of the Evasave single-phase units?

The Evasave is available in six models ranging 6 to 40 amps @ 110 to 220 Volts. Frequency and voltage must be specified at the time of order.

How is Evasave sized?

Due to the many types of single phase motor available and they’re very varied specifications single-phase units are sized using the motors full load amps. Frequency and voltage must be specified at the time of order.

Will Evasave work on poor power supplies?