Danfoss vlt soft starter mcd 500 - Soft Braking

5.13 Soft Braking
For high inertia loads, the VLT
®
Soft Starter MCD 500 can be congured for soft braking.
In this application, the MCD 500 is employed with forward run and braking contactors. When the soft starter receives a start
signal (pushbutton S1), it closes the forward run contactor (K1) and controls the motor according to the programmed
primary motor settings.
When the soft starter receives a stop signal (pushbutton S2), it opens the forward run contactor (K1) and closes the braking
contactor (K2) after a delay of approximately 2–3 s (KT1). K12 is also closed to activate the secondary motor settings, which
are user-programmed for the wanted stopping performance characteristics.
When motor speed approaches zero, the external zero-speed sensor (A2) stops the soft starter and opens the braking
contactor (K2).
3
177HA526.12
6
5
6
4
2
3
1
K3T
K2
K10 K11 K12 K13K1
M1
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F1
K2 K1
K12
S2 K13
A2
K1T
K1T K2T K3T
K1 K2
K1 K2S1 K10 K10
Y1
Y2
Y1
Y2
K10
K2T
4/T2
6/T3
E
1/L1
3/L2
5/L3
2/T1
33
34
A4 A5 A6
05
06
K12
K11 S3
53
1 Control voltage (model dependent) K10 Run relay
2 Remote control inputs K11 Start relay
3 Motor thermistor input (PTC only) K12 Brake relay
4 Relay outputs K13 Zero-speed detector relay
5 3-phase supply K1 Line contactor (run)
6 Motor terminals K2 Line contactor (brake)
A2 Zero-speed sensor K1T Run delay timer
S1 Start contact K2T Brake delay timer
S2 Stop contact K3T Zero-speed detector delay timer
S3 Reset contact
Illustration 5.15 Soft Braking Conguration
Parameter settings:
•
Parameter 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 Primary Motor
Settings).
Product Features
VLT
®
Soft Starter MCD 500
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