!

E6581301!

 

 

 

Example of wiring of each model

!

«VFAS1-2550P, 2750P» «VFAS1-4900PC~4132KPC» «VFAS1-4160KPC~4280KPC»

1

$-! $(./!

Earth cable

PO

PA/+

PO

PA/+ Earth cable!

 

 

 

 

«VFAS1-4355KPC~4500KPC» !

PO.1

PA/+

PO.2

Earth cable!

1.4Notes on the application

1.4.1Motors

Keep the following in mind when using the VF-AS1 to drive a motor.

Caution

Mandatory

Use an inverter that conforms to the specifications of power supply and three-phase induction motor being used. If the inverter being used does not conform to those specifications, not only will the three-phase induction motor not rotate correctly, but it may cause serious accidents through overheating and fire.

Comparisons with commercial power operation

The VF-AS1 Inverter employs the sinusoidal PWM system to supply the motor. This is why compared to operation

with a commercial power there will be a slight increase in motor temperature, noise and vibration. The main supply

voltage and current will also be distorted due to harmonic distortion while increase the line current.

Operation in the low-speed area

When running continuously at low speed in conjunction with a general purpose motor, there may be a decline in

that motor's cooling effect. If this happens, operate with the output decreased from rated load.

To carry out low-speed operation continuously at the rated torque, we recommend to use a inverter rated motor or

a forced cooled motor designed for use with an inverter. When operating in conjunction with a inverter rated motor, you must change the inverter's motor overload protection level to VF motor use (￿￿￿).

Adjusting the overload protection level

The VF-AS1 Inverter protects against overloads with its electronic thermal overload detection circuits. The

electronic thermal's reference current of the inverter must be adjusted in line with the rated current of the motor

being used in combination.

A-17

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Image 30
Toshiba VF-AS1 instruction manual Motors, Comparisons with commercial power operation, Operation in the low-speed area