Product Description

The ABB SDCS-FEX-2 (3ADT306311P2103) is a high-performance field exciter module designed for ABB DCS500 and DCS600 DC drive systems. It provides controlled DC current to the motor’s field windings, enabling precise torque and speed regulation. Compact and robust, it integrates directly into the drive’s converter module, acting as the interface between the drive’s control electronics and the motor field circuit.

Key Features

Accurate Field Current Control
The SDCS-FEX-2 uses advanced feedback and thyristor-based phase control to maintain a stable field current under varying voltage and thermal conditions. This ensures consistent motor torque and smooth operation.

Field Weakening Capability
Allows operation beyond the motor’s base speed by reducing field current while maintaining constant horsepower in high-speed regions. Ideal for applications where speed flexibility is required.

Integrated Protection & Diagnostics

• Overcurrent Protection: Safeguards thyristors from excessive current

• Field Loss Detection: Prevents motor runaway by safely shutting down the drive

• Temperature Monitoring: Prevents overheating during continuous or heavy-duty operation

Seamless Installation
The module is designed for plug-and-play installation with ribbon cable connectors and screw terminals. Its internal mounting format eliminates the need for bulky external field controllers.

Technical Specifications

Applications

• DC motor speed and torque control in industrial drives

• Steel mills, paper production, and other heavy-duty processes

• Replacement or upgrade for internal drive field excitation modules

• Systems requiring precise field weakening for high-speed operation

FAQ

Q: Can the SDCS-FEX-2 be used in other ABB drives outside DCS500/DCS600?
A: It may be compatible with certain DCS800 configurations, but verification is required per drive model.

Q: What protection mechanisms are built in?
A: Includes overcurrent protection, loss-of-field detection, and temperature monitoring.

Q: How is the module cooled?
A: It is air-cooled within the converter cabinet and designed for standard industrial operating conditions.

Q: What is the field current range?
A: Up to 40 A, depending on drive configuration and cooling.

Q: Does installation require modifications?
A: No. It is designed as a plug-in PCB module compatible with ABB drive backplanes.