RHD250-10 ABB

Description

The ABB RHD250-10 is a compact and robust electrical rotary actuator from ABB’s Contrac series, designed for the precise operation of final control elements with rotary movement, such as flaps, dampers, and valves. This maintenance-free actuator provides continuous positioning with a rated torque of 250 Nm and a rated speed of 10 seconds for a 90° rotation. It is engineered for high control precision and reliable performance in demanding industrial applications. Note that the RHD250-10 requires a separate, microprocessor-controlled electronic unit for signal and power input.

Application Scenarios

In a modern HVAC system within a large commercial building, precise control of airflow through dampers is crucial for maintaining optimal temperature and energy efficiency in different zones. The ABB RHD250-10, when paired with an appropriate Contrac electronic unit, provides the accurate and reliable actuation needed for these dampers. The actuator continuously responds to signals from the building management system, adjusting the damper position to regulate airflow based on temperature sensors and occupancy levels. Its stall-proof design ensures that it can maintain the required position without damage, and the adjustable mechanical limit stops guarantee operation within a defined range, contributing to a comfortable indoor environment and reduced energy consumption.

Parameter

Main Parameters Value/Description Product Model RHD250-10 Manufacturer ABB Product Category Electrical Rotary Actuator (Contrac Series) Rated Torque 250 Nm (200 lbf-ft) The maximum continuous torque the actuator can deliver. Rated Speed 10 s/90° The time required for a 90-degree rotation at rated conditions. Operating Angle Min. 35° / Max. 300° Adjustable range of rotational movement. Control Type Continuous positioning, three-point, or bus control Versatile control options depending on the electronic unit. Protection Class IP66 Dust-tight and protected against powerful water jets. Ambient Temperature Dependent on electronic unit Typically -20°C to +70°C (refer to the electronic unit’s specifications). Duty Cycle S9 – Stall proof According to DIN IEC 2/915/CDV, suitable for continuous operation. Weight Approx. 45 kg (including lever) Approximate weight of the actuator with a standard lever.

Technical Principles and Innovative Values

Innovation Point 1: Stall-Proof Design. The RHD250-10 is designed to be stall-proof, meaning it can hold its position against the maximum torque without requiring position or torque-dependent shut-off mechanisms. This enhances reliability and reduces wear.
Innovation Point 2: High Positioning Accuracy. When used with a Contrac electronic unit, the actuator offers high response sensitivity and positioning accuracy, ensuring excellent control quality for the final control element.
Innovation Point 3: Maintenance-Free Operation. The robust design and oil-lubricated spur gear contribute to a long, maintenance-free service life of up to 10 years, reducing operational costs and downtime.
Innovation Point 4: Adjustable Mechanical Limit Stops. The actuator features adjustable mechanical limit stops, allowing for precise definition of the operating range and protecting the connected equipment.

Application Cases and Industry Value

In a chemical processing plant, precise control of butterfly valves regulating the flow of various fluids is critical for maintaining product quality and safety. The ABB RHD250-10, paired with an appropriate ABB Contrac electronic unit, provides the reliable and accurate actuation required for these valves. The continuous positioning capability ensures that the flow rates are precisely controlled according to the process requirements. The robust IP66 protection class ensures reliable operation even in the challenging environmental conditions of a chemical plant. The maintenance-free design reduces the need for frequent inspections and servicing, contributing to increased plant uptime and reduced operational expenses.

Installation, Maintenance, and Full-Cycle Support

The ABB RHD250-10 is designed for direct mounting to the final control element. Installation requires secure mechanical coupling and proper wiring to a compatible ABB Contrac electronic unit (purchased separately). Refer to the manuals for both the actuator and the electronic unit for detailed installation instructions. The RHD250-10 is designed for a long, maintenance-free service life under normal operating conditions, minimizing the need for routine servicing. However, periodic visual inspections to ensure proper mechanical connections and the absence of damage are recommended. In the event of a malfunction, troubleshooting should focus on the electronic control unit and the input signals. ABB provides comprehensive technical documentation, including installation manuals and wiring diagrams. Our global service network offers support for commissioning, maintenance, and repairs, ensuring the long-term reliability of your ABB actuation system.