Description

Quarter-turn Explosion-proof Electric Actuator Overview

The quarter-turn explosion-proof electric actuator BJ/BJM150-IIC series from Bonray requires minimal maintenance due to its robust design: no brushes, no mechanical shift mechanism, and sealed lubrication. However, to maximize service life (our factory estimates 10+ years in typical duty), you should perform periodic inspections and follow a few troubleshooting steps. This guide, based on our factory’s field service experience, covers routine checks, common error codes, firmware updates, and spare parts management. We also explain how to interpret the LCD alarm messages and use the data logger for predictive maintenance. Because the actuator uses absolute encoders, you never need to recalibrate position after power loss. The self-locking gear train eliminates brake wear. By following the active-voice recommendations below, you will keep your valves operating reliably. Our factory provides a 2-year warranty and lifetime phone support.

What does the “Alarm” LED and relay indicate?

The MONI alarm relay activates (changes from NO to NC) for any of these conditions: phase loss, motor overheat, simultaneous open/close commands, analog signal loss, ESD active, parameter setting mode active, internal board fault, or any user-configured alarm (e.g., torque trip). The LCD shows a specific message. Our factory recommends wiring the alarm relay to your DCS for remote notification.

Quarter-turn Explosion-proof Electric Actuator Features

From a maintenance perspective, these features reduce downtime:

Non-Intrusive Configuration

Because you never open the cover to adjust settings, the internal electronics stay clean and dry. This eliminates common faults like corrosion on potentiometers or loose ribbon cables. Our factory seals the control board with conformal coating.

Absolute Encoder – No Battery

Competitor actuators often use incremental encoders that require battery backup to retain position. Our BM12 absolute encoder needs no battery. You never face a “dead battery – position lost” scenario. Our factory provides a 10-year data retention guarantee.

Self-Diagnostic Power-Up

Every time you apply power, the actuator checks:

• Encoder communication (CRC)

• Torque sensor zero offset

• Memory checksum for all parameters

• Relay coil integrity

• Thermal switch continuity
  If any test fails, the actuator shows a specific error code and prevents motor operation. This protects your valve from uncontrolled movement.

Data Logger for Predictive Maintenance

The logger stores the last 100 events with a timestamp (in seconds from power-up). Events include:

• Each open/close cycle (with peak torque)

• Torque trip occurrences

• ESD activations

• Power loss (duration)

• Motor overheat

• Phase loss
  You can retrieve this log via Modbus or the front panel. Our factory uses this data to recommend preventive replacement of worn valves.

  

Removable Terminal Block 

For quick replacement, order the plug-in terminal block. You pre-wire the removable half; to swap the actuator, unplug the block, remove four bolts, and install a new unit. No rewiring. Our factory ships the CB1 option with a spare terminal block.

Wear-Free Solid-State Outputs

BJM models use solid-state relays for motor control and signal outputs. No arcing, no contact welding, no noise. This suits applications with frequent starts (e.g., 600-1200 per hour). Our factory guarantees the solid-state outputs for 10 years.

Handwheel with Free Clutch

Because you can operate the handwheel while the motor is running, you never need to pull a shift lever that could break. The handwheel rotates when the motor runs (slowly), so keep hands clear. Our factory provides a warning label on the handwheel.

Data Sheet

Specifications