SoftstarterTheoryLow Voltage Products & Systems Automation Technology

ABB Basic Softstarter Characteristics *

Prevent or eliminate.

Stress on motorStress on gear boxesStress on beltsSystem disturbances

Also

Prolong machinery lifeWhy use a softstarter?

ABB Basic Softstarter Characteristics *

Motor Starting - Full VoltageMotor TorqueLoad Torque

ABB Basic Softstarter Characteristics *

A Simple SoftstarterAcceleration Time

ABB Basic Softstarter Characteristics *

Softstarter with Softstop

ABB Basic Softstarter Characteristics *

Softstarter with Softstop and Current LimitNewAcceleration TimeCurrent LimitReached

ABB Basic Softstarter Characteristics *

Motor Torque withSoftstarterMotor Starting - Softstarter

ABB Basic Softstarter Characteristics *

Key Features of Softstarters Can define starting voltage Can define a current limit Can define the acceleration time

Softstop is sometimes available (pump applications)

ABB Basic Softstarter Characteristics *

SCRs are high speed one-way switches used with AC power. By switching on late we can decrease the RMS or average voltage that the motor can react to.How Softstarters Work

ABB Basic Softstarter Characteristics *

By using opposing SCRs, we can control both sides of the sine wave.How Softstarters Work

ABB Basic Softstarter Characteristics *

By advancing the Gating or firing point, we can ramp the voltage up (or down).How Softstarters Work

ABB Basic Softstarter Characteristics *

What do I Select?*Call Factory

ABB Basic Softstarter Characteristics *

Presentation SpecificationObjective: Detailed design and positioning of the MNS familyAudience:BU LVS and ABB personnelVolume:20-40 overheads for PC and manual projection, no script. User:BU LVS support and management or self study