Both ECM (Electronically Commutated Motors) and VFDs (Variable Frequency Drives) can receive 0-10V DC analog signals from BMS/DDC controllers, but they interpret and respond to these signals differently.

Key Differences:

ECM Motors

• Typically used in smaller systems like FCUs, AHUs, and RTUs

• Accept a 0-10V input signal to directly control motor speed

• Integrated motor and controller unit

• Easier to install but with limited feedback and control features

VFDs

• Used for larger motors and complex systems

• Accept multiple input types: 0-10V DC, 4-20mA, Modbus, BACnet

• Offer advanced features: speed ramping, fault diagnostics, torque control

• Can be paired with any standard induction motor

Takeaway:

For small, space-efficient applications, an ECM with 0-10V control might suffice. For advanced control, richer integration, and scalable feedback, a VFD with 0-10V or protocol-based control is the smarter choice.