Danfoss vlt soft starter mcd 500 - Adaptive Control; Kick Start

5.3.3 Adaptive Control
In an adaptive control soft start, the soft starter adjusts the
current to start the motor within a specied time and uses
a selected acceleration prole.
NOTICE
Adaptive control cannot start the motor faster than a
direct on-line (DOL) start. If the time set in parameter 1-6
Start ramp time is shorter than the motor DOL start time,
starting current may reach DOL levels.
Every application has a particular starting prole based on
characteristics of the load and the motor. To suit the
requirements of dierent applications, adaptive control
oers 3 dierent starting proles. Selecting a prole that
matches the inherent prole of the application can help
smooth out acceleration across the full start time. Selecting
a dierent adaptive control prole can neutralize the
inherent prole to some extent.
To use adaptive control to control starting performance:
1. Select Adaptive control in parameter 1-3 Start
Mode.
2. Set parameter 1-6 Start Ramp Time.
3. Select the wanted prole in parameter 1-13
Adaptive Start Prole.
4. Set parameter 1-4 Current Limit suciently high to
allow a successful start.
The rst adaptive control start is a constant current start.
This start type allows the soft starter to learn the charac-
teristics of the connected motor. The soft starter uses this
motor data during subsequent adaptive control starts.
0
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Time
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Speed
1
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1 Early acceleration
2 Constant acceleration
3 Late acceleration
4 Parameter 1-16 Start Ramp Time
Illustration 5.4 Parameter 1-13 Adaptive Start Prole
NOTICE
Adaptive control regulates the load according to the
programmed prole. Start current varies according to the
selected acceleration prole and the programmed start
time.
The soft starter has to learn the characteristics of a new
motor:
•
If replacing a motor connected to a soft starter
programmed for adaptive control starting or
stopping.
•
If the soft starter has been tested on a dierent
motor before actual installation.
If parameter 1-1 Motor Full Load Current or parameter
1-12 Adaptive Control Gain is changed, the soft starter
automatically relearns the motor characteristics.
5.3.4 Kick Start
Kick start provides a short boost of extra torque at the
beginning of a start, and can be used with current ramp or
constant current starting.
Kick start can be useful to help start loads that require
high breakaway torque but then accelerate easily (for
example ywheel loads such as presses).
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Rotor speed (% full speed)
60% 70% 80% 90% 100%
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Current (% motor full load current)
1
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4
6
3
2
1 Parameter 1-7 Kick Start Level
2 Parameter 1-8 Kick Start Time
3 Parameter 1-5 Initial Current
4 Parameter 1-6 Start Ramp Time
5 Parameter 1-4 Current Limit
6 Full voltage current
Illustration 5.5 Example of Rotor Speed when using Kick Start
Product Features Operating Guide
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