AMD LV-651 User's Especificações descarregar pdf (Página 57)

Application Examples Softstart UK

10.7. Two Speed Motor

The LV-DS can be configured for control of dual speed Dahlander type motors, using a high speed contactor

(KM1), low speed contactor (KM2) and a star contactor (KM3).

NOTE

Pole Amplitude Modulated (PAM) motors alter the speed by effectively changing the stator

frequency using external winding configuration. Soft starters are not suitable for use with this type

of two-speed motor.

When the soft starter receives a high speed start signal, it closes the high speed contactor (KM1) and star

contactor (KM3), then controls the motor according to the primary motor settings.

When the soft starter receives a low speed start signal, it closes the low speed contactor (KM2). This closes

Input A and the LV-DS controls the motor according to the secondary motor settings.

08882.A

2/T1

4/T2

6/T3

1/L1

3/L2

5/L3

KA1

KA2

KA1

KA2

KM3

KA1

KM2

KA2

KM1

KM2

KM3

KM1

KM3

KM1

KM3

KM2

KM1

KA1

Control voltage

KA1

Remote start relay (low speed)

Remote control inputs

KA2

Remote start relay (high speed)

Relay outputs

KM1

Line contactor (high speed)

Three-phase supply

KM2

Line contactor (low speed)

Motor terminals

KM3

Star contactor (high speed)

Remote low speed start input

Reset contact

Remote high speed start input

21, 22, 24

Relay output B

NOTE

Contactors KM2 and KM3 must be mechanically interlocked.

Parameter settings:

• Parameter 6D Input A Function

• Select 'Motor Set Select' - assigns Input A for Motor set selection.

• Set high speed performance characteristics using the primary motor settings.

• Set low speed performance characteristics using the secondary motor settings.

• Parameter 7D Relay B Function

• Select 'Trip' - assigns Trip function to Relay Output B

NOTE

If the LV-DS trips on supply frequency (parameter 16F Frequency) when the high-speed start

signal (7) is removed, modify the frequency protection settings.

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