Dc Brake - Danfoss VLT MCD 600 Operating Manual

Operating Guide | VLT® Soft Starter MCD 600
Adaptive control controls the motor's speed profile, within the programmed time limit. This may result in a higher level of
current than traditional control methods.
If replacing a motor connected to a soft starter programmed for adaptive control starting or stopping, the soft starter has to learn the
characteristics of the new motor. Change the value of parameter 1-2 Motor Full Load Current or parameter 2-12 Adaptive Control Gain to
initiate the relearning process. The next start will use constant current and the next stop will use TVR.
100
90
80
70
1
60
50
40
30
20
10
0
1 Early deceleration
3 Late deceleration
Illustration 31: Example of Adaptive Control Stop (Parameter 2-11 Adaptive Stop Profile)
Adaptive control is ideal for pumping applications where it can minimize the damaging effects of fluid hammer. Test the 3 profiles to
identify the best profile for the application.
Adaptive stop profile Application
Late deceleration High-head systems where even a small decrease in motor/pump speed results in a rapid transition between
forward flow and reverse flow.
Constant deceleration Low to medium head, high-flow applications where the fluid has high momentum.
Early deceleration Open pump systems where fluid must drain back through the pump without driving the pump in reverse.

9.9.4 DC Brake

A brake reduces the time required to stop the motor.
During braking, an increased noise level from the motor may be audible. This is a normal part of motor braking.
When using DC brake, the mains supply must be connected to the soft starter (input terminals L1, L2, and L3) in positive phase
sequence.
62 | Danfoss A/S © 2018.10
4
2 3
Time
N O T I C E
2 Constant deceleration
4 Parameter 2-10 Stop Time
N O T I C E
Operation
AQ262141844215en-000202 / 175R1174