Description

Overview of Multi Turn Explosion-proof Actuator BD200-C8

The multi turn explosion-proof actuator represents the pinnacle of valve automation technology, and the BD200-C8 series from Bonray exemplifies this evolution.

This series combines robust mechanical construction with advanced digital intelligence, offering a comprehensive solution for quarter-turn and multi-turn valve applications. Unlike traditional actuators that require cumbersome setup, the BD200-C8 multi turn explosion-proof actuator features a non-intrusive design, allowing operators to configure, control, and diagnose the unit without removing the electrical cover. This preserves the IP68 environmental seal, ensuring reliability in the harshest conditions. The actuator leverages a proprietary absolute encoder position sensor that retains valve position data even during a power outage, eliminating the need for backup batteries and ensuring data integrity. Our factory integrates high-grade, lifelong lubrication within the gear train, significantly reducing maintenance costs and extending the operational lifespan of the unit.

Features of Multi Turn Explosion-proof Actuator BD200-C8

• Non-Intrusive, Magnetically Coupled Control: The BD200-C8 multi turn explosion-proof actuator eliminates the need for open shafts that penetrate the housing. Instead, magnetic switches (Hall sensors) interpret user commands from external knobs or an infrared setting tool. This design prevents moisture, dust, and corrosive gases from entering the control compartment, dramatically enhancing long-term reliability.

  

• Intuitive HMI (Human-Machine Interface): The high-resolution dot-matrix LCD displays valve position, torque values, and diagnostic alarms in clear, easy-to-understand text and graphics. Dual LED indicators (red for closed, green for open) provide immediate visual status confirmation from a distance.

  

• Advanced Mechanical Design: We designed the housing from lightweight, high-strength aluminum alloy. A double-sealing structure protects the terminal compartment, allowing maintenance personnel to wire the unit without exposing internal electronics to the elements. The handwheel includes a patented anti-misoperation pin that physically locks out manual override when not in use.
• Bluetooth Connectivity (Optional): Operators can connect to the actuator wirelessly via a mobile device. This feature facilitates parameter setting, real-time monitoring, and data logging for predictive maintenance, bringing valve control into the Industry 4.0 era.

Protect Function of Multi Turn Explosion-proof Actuator 

Our factory engineers built this series with a “safety-first” philosophy. The BD200-C8 multi turn explosion-proof actuator integrates multiple layers of protection:

• Phase Protection: It automatically detects and corrects the incoming three-phase power supply sequence, eliminating the risk of motor damage due to incorrect wiring. It also halts operation if a phase is lost, preventing single-phasing burnout.
• Torque and Thermal Management: The actuator employs continuous torque measurement, allowing the user to set precise torque limits to protect the valve stem from damage. Additionally, a thermal relay embedded in the motor windings provides real-time temperature monitoring, shutting down the unit before overheating occurs.
• Instantaneous Reversal Protection: The logic circuit introduces a user-defined delay when a reverse command is received. This prevents hammering effects on the valve seat and gearbox, preserving mechanical integrity.

Control Methods

The BD200-C8 multi turn explosion-proof actuator supports an extensive array of control strategies, making it a versatile asset for any process control system:

• Local Control: Using the “Local/Stop/Remote” selector knob, operators can control the valve directly at the site in “Jog” or “Hold” modes.
• Remote Discrete Control: Accepts standard open/close/stop commands via dry contacts or high-voltage signals.
• Remote Analog Control: Provides precise positioning via a standard 4-20 mA input, with 4-20 mA position feedback.
• ESD (Emergency Shutdown): Overrides all other control signals to drive the valve to a predefined safe position (open, close, or hold) upon an emergency signal.
• Fieldbus Control: Supports Profibus-DP, Modbus, DeviceNet, Foundation Fieldbus, and HART via plug-in modules, allowing seamless integration into DCS or PLC networks.

  

Model and Type

Bonray structures the series to match specific duty cycles:

• BD-C8 (On-Off/Intermittent Duty): Ideal for general-purpose applications with moderate cycling (up to 60 starts/hour). It offers robust torque outputs ranging from 50 N.m to 3500 N.m.
• BDM-C8 (Modulating Duty): Designed for high-frequency applications such as flow or pressure control. It utilizes solid-state relays for silent, wear-free operation, achieving up to 1200 starts/hour (600 for single-phase) with a duty cycle of 50%.

Specifications

• Power Supply: Standard 380V/50Hz/3Ph (Optional: 220V/1Ph, 400V, 415V, 440V, 110V).
• Control Signal: 4-20 mA, Dry Contacts, Profibus-DP, Modbus RTU.
• Feedback Signal: 4-20 mA (Isolated), 4 user-configurable bistable relay outputs.
• Ambient Temperature: -30°C to +70°C (Extended range available).
• Enclosure Protection: IP68 (Submersible).
  

  BD200-C8 Three Phase
  Output Speed (rpm)	Rated Torque (N.m)	Motor Power (KW)	Locked Current (A)	Rated Current (A)	Weight (kg)
  24	2050	4	66.19	12	126
  36	2050	4	66.19	12
  48	1600	5	82.73	15
  72	1400	8	141.39	28
  96	1100	8	141.39	28
  144	900	8	141.39	28

Related product

BD/BDM-C8F (Split Type) multi turn explosion-proof actuator: Ideal for high-temperature or high-vibration environments. We separate the electrical control unit from the mechanical actuator, connecting them via a 10-meter cable, allowing the control unit to be mounted in a safe, accessible location while the actuator operates in the harsh zone.

Can I use this actuator in a hazardous environment?

Yes. Our factory produces explosion-proof (Ex db IIC T4 Gb) and dust-ignition-proof (Ex tb IIIC T130°C Db) versions. Please specify this in your order.