Description

On-off Multi-turn Actuator Overview

Selecting the correct on-off multi-turn actuator for your valve is critical to ensuring reliable, long-term performance. To address this need, Bonray developed the BD150-C8 series to offer a wide range of options, allowing you to find the perfect fit for your specific application. In this guide, we will help you navigate the selection process, from understanding torque and speed requirements to choosing the right control type, gearbox, and special options. Our goal is to make your decision straightforward, ensuring you get a multi-turn electric actuator that integrates seamlessly with your system and operates flawlessly in your plant environment. Furthermore, the engineering team at our Bonray factory designed this series with modularity in mind, so you can build a solution that precisely meets your needs without paying for unnecessary features.

How do I choose between the On-off Multi-turn Actuator BD-C8 and BDM-C8 series?

The choice depends on your duty cycle and control requirements. Specifically, the on-off multi-turn actuator BD-C8 series (On-Off and Intermittent Modulating) is ideal for applications with up to 60 starts per hour and a 33.3% duty cycle. In contrast, the BDM-C8 Frequent Modulating type, with its solid-state relays and advanced cooling, handles up to 1200 starts per hour and a 50% duty cycle. Therefore, for modulating control on continuous processes, the BDM-C8 is the superior multi-turn electric actuator. Meanwhile, for simpler open/close tasks, the BD-C8 is a perfect fit.

On-off Multi-turn Actuator Features

We designed the BD150-C8 series on-off multi-turn actuator for maximum flexibility. The non-intrusive setup means you can commission the multi-turn electric actuator without ever opening the electrical cover, a significant advantage after installation in a difficult-to-reach location. The dual-seal design allows for safe wiring, even in dusty or wet environments, because the inner seal protects the electronics while you are working on the terminal block.

The clear dot-matrix display provides immediate, local feedback on torque and position, making setup and troubleshooting easy. The manual operation system includes a “pull-and-push” handwheel that is easy to engage and includes a lockout point, providing a secure method for manual override. These user-centric features, standard across all models from Suzhou Bonray, simplify both the initial installation and ongoing maintenance tasks.

Protect Function

All protective features listed for the BD150-C8 series on-off multi-turn actuator are standard. This means every multi-turn electric actuator from Bonray comes with automatic phase correction, phase loss protection, motor thermal protection, torque overload protection, and instantaneous reversal protection. You do not have to choose these as options; they are core to the design.

This comprehensive standard protection suite ensures that regardless of the model you select, you get a device that will actively prevent damage to itself and your valve. For example, the “valve seizure protection” is a standard feature that can help free a stuck valve without external intervention. This reliability-first approach is what you can expect from Suzhou Bonray.

Control 

When you order your on-off multi-turn electric actuator, you determine its control capabilities by selecting the base type and any optional cards. The standard BD-C8 On-Off Type includes remote switch control and local control. For analog control, you must specify the BD-C8 Intermittent Modulating Type. For fieldbus capabilities, you select the appropriate bus card from the options (Profibus-DP, Modbus, etc.).

Model and Type

BD/BDM-C8 Series Multi-turn Intelligent Electric Actuator is available in three types: On-Off Type, Intermittent Modulating Type, and Frequent Modulating Type.

• BD-C8 On-Off Type Actuator: Does not have proportional control functionality. Suitable for applications where the operating frequency does not exceed 60 times per hour, continuous operation time does not exceed 15 minutes, and the duty cycle does not exceed 33.3%.
• BD-C8 Intermittent Modulating Type Actuator: Features proportional control functionality. Suitable for applications where the operating frequency does not exceed 60 times per hour (for three-phase models, short-term operating frequency can reach up to 600 times per hour), continuous operation time does not exceed 15 minutes, and the duty cycle does not exceed 33.3%.
• BDM-C8 Frequent Modulating Type Actuator: Adopts a motor capable of frequent starting and stopping. The motor control drive unit uses contactless solid-state relays. By employing higher-speed and higher-precision control chips and components, along with further optimized programs and control circuits, it achieves an operating frequency of up to 1200 times per hour (600 times per hour for single-phase models) under modulating torque, with a duty cycle of up to 50%.

The Frequent Modulating Type Actuator offers higher positioning accuracy than the On-Off Type and the Intermittent Modulating Type actuators, and is well suited to meet the requirements of the actuating unit in closed-loop automatic control loops for most industrial applications.

Specifications

• Power Supply: 380VAC ±10%, 50Hz ±2% (3-phase), or 220VAC ±10%, 50Hz ±2% (1-phase). Other voltages/frequencies (110V, 115V, 208V, 230V, 400V, 415V, 440V at 50/60Hz) are available.
• Control Input: 4-20mA analog, dry contacts, 24VDC, 220VAC pulse/level signals, and fieldbus protocols.
• Feedback Output: 4-20mA analog, 4 configurable bi-stable output contacts, 1 remote indication contact, 1 fault alarm contact.
• Output Torque: 50 N.m to 3500 N.m (up to 300,000 N.m with gearboxes).
• Output Speed: 12 rpm to 144 rpm 
• Ambient Temperature: -30°C to +70°C.
• Protection Class: IP68 (waterproof), optional Ex db IIC T4 Gb (gas explosion-proof), Ex tb IIIC T130℃ Db (dust explosion-proof).
• Mounting: Complies with ISO 5210:2017 (GB/T12222-2023) and JB2920-81.