Delta 28-299A Instruções de Operação descarregar pdf (Página 40)

5.12 Soft Braking

For high inertia loads the MCD 500 can be configured for soft braking.

In this application the MCD 500 is employed with forward run and braking contactors. When MCD 500 receives a start signal

(button S1), it closes the forward run contactor (KM1) and controls the motor according to the programmed primary motor

settings.

When the MCD 500 receives a stop signal (button S2), it opens the forward run contactor (KM1) and closes the braking contactor

(KM2) after a delay of approximately 2-3 seconds (KT1). KA3 is also closed to activate the secondary motor settings, which should

be user programmed for the desired stopping performance characteristics.

When motor speed approaches zero, the external shaft rotation sensor (A2) stops the soft starter and opens the braking

contactor (KM2).

177HA526.10

KM2

KA1 KA2 KA3 KA4KM1

15 16 251817

KM2 KM1

KA3

S2 KA4

KT1

KT1 KT2

KM1 KM2

KM1 KM2S1 KA1 KA1

KA1

KT2

4/T2

6/T3

1/L1

3/L2

5/L3

2/T1

A4 A5 A6

KA3

KA2 S3

Control voltage (model dependent) KA3 Brake relay

Remote control inputs KA4 Rotation sensing relay

Motor thermistor input (PTC only) KM1 Line contactor (Run)

Relay outputs KM2 Line contactor (Brake)

3-phase supply KT1 Run delay timer

Motor terminals KT2 Brake delay timer

A2 Shaft rotation sensor

S1 Start contact

KA1 Run relay S2 Stop contact

KA2 Start relay S3 Reset contact

Parameter settings:

•

Par. 3-3 Input A Function

•

Select Motor Set Select - assigns Input A for Motor set selection

•

Set starting performance characteristics using the primary motor set (parameter group 1)

•

Set braking performance characteristics using the secondary motor settings (parameter group 7)

•

Par. 4-7 Relay C Function

•

Select Trip - assigns Trip function to Relay Output C

Application Examples MCD 500 Operating Instruction

MG.17.K3.02 - VLT

is a registered Danfoss trademark 39

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