ABB Drives INVERTER-VFD PULSE ENCODER INTERFACE

The Pulse Encoder Interface for ABB’s high-performance drives like the ACS880 and ACS800 is a crucial option board that enables high-precision speed and torque control through closed-loop vector control. This interface allows the drive to read precise speed and position feedback from an incremental or absolute encoder attached to the motor shaft.

Key Interface Modules

Drive Series	Interface Module	Function and Features
ACS880	RDCU-02 Control Unit + Various Modules	The modern ACS880 uses a unified control unit (RDCU-02) that can accept specialized Pulse Encoder Modules (like the FSPS-21 for standard incremental encoders). It integrates seamlessly with the DRIVE AP control program.
ACS800	RMIO- Control Board + Option Modules	Older ACS800 drives use different control units (RMIO-xx) that required specific Option Control Program (OCP) modules, such as the OCP-01 or OCP-02, to process encoder signals.

Supported Encoder Types

When ordering, it’s essential to specify the exact drive model and the type of encoder (PPR, voltage level, and whether it’s incremental or absolute) to ensure the correct interface module is selected.

TTL/RS-422: differential signals (required for high-speed and long-distance transmission).
Sine/Cosine Encoders: Used for extremely high-resolution, precise applications (often requires a dedicated or high-end module).