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Product Manual escostart DS3 29
6.3 Soft Start Methods
Soft starters offer a variety of methods to control motor starting. Each soft start method uses a different
primary control parameter.
Soft Start Method Parameter
Controlled
Performance Parameters Influenced
Timed Voltage Ramp Voltage Start current, start torque, acceleration
Constant Current Current Start torque, acceleration
Torque Control Torque Start current, acceleration
Adaptive Acceleration Control Acceleration Start current, start torque
Best results are obtained by selecting the soft start method that directly controls the parameter of most
importance for the application. Typically soft starters are used to limit motor start current or control load
acceleration and/or deceleration. The escostart DS3 can be set to either Constant Current or AAC Adaptive
Acceleration Control.
To Control Use
Motor Start Current Constant Current
Motor/Load Acceleration or Deceleration AAC Adaptive Control
6.3.1 Constant Current
Constant current is the traditional form of soft starting, which raises the current from zero to a specified level
and keeps the current stable at that level until the motor has accelerated.
Constant current starting is ideal for applications where the start current must be kept below a particular level.
Current (%motor full load current)
700%
600%
500%
400%
300%
200%
100%
3
1
2
10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
Rotor speed (% full speed)
1: Initial current (parameter 2C)
2: Current limit (parameter 2B)
3: Full voltage current
Product Manual escostart DS3 29