Selection Guide
How Softstarters, Drives and PLC/PAC Controls Work Together
Understand the role of each device class for clearer design and inquiry communication.
Updated September 2, 2026
Soft Starting
Variable Speed
PLC / PACRoles at a Glance
Three Device Classes, Three Different Roles
Softstarter: Starting and Stopping
Reduces starting current and mechanical stress through controlled ramp-up and ramp-down.
Drive: Speed and Operating Control
Controls motor speed by varying output frequency and voltage.
PLC/PAC: Logic, Interlocking and Coordination
Handles machine logic, sequencing, interlocks and system communication.
System Position
Protection, Starting, Speed and Control Each Have a Role
Softstarters or drives act on motor operation while PLC/PAC controls higher-level logic and coordination. Protection, distribution, sensors and supervisory systems also form part of the final architecture.
Before You Inquire
Prepare This Information to Reduce Rework
Motor NameplateLoad TypePower SupplyControl & CommsEnvironment
