The ABB SDCS-UCM-1C (3ADT220090R0008) is a specialized measurement and resistor board designed for use with ABB DCS880 and DCS800 thyristor power converters. This component is specifically engineered for drive frame sizes H1 through H5, where standard internal DC voltage measurement integration may be insufficient for complex configurations such as those utilizing DC-breakers or US-style DC-contactors.

Features

• Enables external DC voltage measurement directly at the motor terminals for H1 to H5 frame sizes.
• Features two integrated resistor chains for effective voltage reduction.
• Designed for external mounting outside the primary drive module.
• Includes dual DC voltage terminal connections (X1 and X2) for flexible wiring based on nominal motor voltage.
• Facilitates accurate voltage feedback to the drive's analog input (AI3) even when DC-breakers are open.

Applications

• Industrial Cranes & Hoists: Support for port, overhead, and shipyard crane winches.
• Conveyor Systems: Reliable control for overland bulk material transport.
• Rolling Mills: High-torque variable-speed control for hot and cold milling processes.
• Wire Drawing Machines: Maintaining continuous tension during metal processing.
• Cable Cars & Ski Lifts: Ensuring smooth acceleration and fail-safe deceleration.

Technical Specifications

Installation Guidelines

• Cable Selection: Always utilize twisted, shielded pair cables for instrumentation feedback lines to minimize electromagnetic interference (EMI).
• Ground Routing: Connect the board’s protective earth (PE) terminal directly to the main drive chassis ground plane.
• Segregation: Maintain high-ohmic segregation by keeping high-voltage resistor measurement paths physically separate from low-voltage control or communication cables.
• Mounting: Ensure the board is securely mounted in an environment protected from excessive dust and moisture, following the specific clearance requirements for the drive cabinet.

FAQ

What is the primary function of the SDCS-UCM-1C board?

The SDCS-UCM-1C acts as a measurement and resistor interface. It allows the drive to obtain an accurate DC voltage measurement from the motor terminals, which is then fed into the drive's analog input (AI3) for closed-loop regulation, particularly useful when a contactor or breaker is installed between the drive and the motor.

Which drive series is this board compatible with?

This board is primarily designed for the ABB DCS880 and DCS800 series thyristor power converters, specifically for frame sizes H1 through H5.

Why is this board necessary for H1-H5 frame sizes?

In these specific frame sizes, the DC voltage measurement is integrated into the internal control board. If a DC-breaker or contactor is opened, the internal measurement cannot see the motor voltage. The SDCS-UCM-1C provides an external measurement path that remains active regardless of the state of the DC-breaker.