ABB 3AXD50000023987 Drive Control Module

ABB 3AXD50000023987 Drive Control Module (FSO-21 Safety Functions Module)

 

The ABB 3AXD50000023987 is the FSO-21 Safety Functions Module, an optional safety control module used in ABB ACS880 industrial drives. It is designed to extend the drive’s built-in safety system and provide certified functional safety functions for motor and machine protection.

It does not control the motor directly. Instead, it supervises the drive and triggers safety actions such as safe stop when required.

Key Specifications

• Model: FSO-21
• Order Code: 3AXD50000023987
• Product Type: Drive Safety Functions Module
• System: ABB ACS880 Drive Series
• Safety Level: Up to SIL 3 / PL e (system dependent)
• Functions: Safe Torque Off (STO), Safe Stop (SS1), Safe Limited Speed (SLS), Safe Maximum Speed (SMS)
• Communication: Works with drive internal safety architecture
• Optional Interface: Encoder feedback via FSE module (when required)
• Installation: Plug-in option module inside drive
• Application Type: Functional safety expansion for VFD systems

Features & Advantages

• Certified functional safety (SIL3 / PL e) support
• Expands standard drive safety beyond basic STO
• Enables advanced motion safety functions (speed monitoring, safe stop modes)
• Reduces need for external safety relays and wiring
• High integration with ABB ACS880 platform
• Reliable protection for operators and machinery
• Supports safety communication with PLC systems (depending configuration)

Applications

• Industrial variable frequency drive systems (ACS880)
• Robotics and automated machinery
• Conveyor and material handling systems
• Pumps, compressors, and fans
• Metal processing and heavy machinery
• Safety-critical production lines

Precautions

• Must only be used with compatible ABB ACS880 drives
• Safety functions require correct configuration via ABB Drive Composer
• Incorrect setup may compromise safety certification
• Installation must be performed by qualified technicians
• Do not assume it controls motion directly (it only triggers safety actions)
• Ensure system meets SIL/PL design requirements end-to-end