Adaptive Control For Starting - Danfoss VLT MCD 600 Operating Manual

VLT® Soft Starter MCD 600
Operating Guide
TVR soft starting is not suitable for high-inertia loads (such as fans), which require a high level of voltage to accelerate the load.
For multiple motors of the same size, and/or mechanically coupled loads, use constant current starting.
For a timed voltage ramp start, the following are typical values and can be adjusted to suit a specific application:
•
Add the FLC value of all the connected motors. Use this combined value to set parameter 1-2 Motor Full Load Current.
The combined value must not exceed the soft starter rating.
•
Set parameter 2-3 Initial Current to 100%, parameter 2-4 Current Limit to 500%, and set the ramp time as required (parameter 2-2
Start Ramp Time).
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2
1
Illustration 32: Example of TVR
1 Initial current (parameter 2-3)
2 Curret limit (parameter 2-4)
3 Start ramp time (parameter 2-2)

9.8.5 Adaptive Control for Starting

In an adaptive control soft start, the soft starter adjusts the current to start the motor within a specified time and uses a selected
acceleration profile.
The soft starter applies the current limit on all soft starts, including adaptive control. If the current limit is too low or the start
ramp time (set in parameter 2-2 Start Ramp Time) is too short, the motor may not start successfully.
Danfoss A/S © 2020.12
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4 Full voltage
5 Motor 1 current
6 Motor 2 current
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Operation
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