The Foxboro FBMSVH is an electro-hydraulic servo control card specifically designed for industrial scenarios, primarily compatible with Foxboro Distributed Control Systems (DCS). Its core function is to achieve closed-loop precision control of pneumatic or hydraulic servo mechanisms. By receiving control commands from the upper-level system and adjusting them in conjunction with feedback component signals, it drives servo valves to regulate key parameters such as the position, speed, and force of hydraulic actuators. Equipped with comprehensive signal output, fault diagnosis, and protection capabilities, the card is widely used in industrial sectors with high control precision requirements—including petrochemicals, power generation, and pharmaceuticals—thanks to its strong compatibility and high reliability.
Core Functions
Servo Closed-Loop Control: Accepts 4-20mA current or 0-10VDC voltage control commands. Combined with 0-10V signals fed back by Linear Variable Differential Transformers (LVDTs), it performs proportional or proportional-integral (P/PI) regulation and outputs ±27mA current to drive servo valves. This enables precise control of position, speed, and force for hydraulic actuators such as hydraulic cylinders and hydraulic motors.
Signal Output & Diagnosis: Provides 0-20mA valve position signals (50Ω impedance) to facilitate real-time status monitoring of actuators by the upper-level system. Equipped with built-in protection circuits, external shutdown contacts, and self-diagnostic functionality, it allows maintenance personnel to quickly locate faults and conduct repairs efficiently.
Key Technical Parameters
| Parameter Category | Details |
|---|---|
| Power Supply Specifications | Adopts ±15VDC power supply; current of each ±15V power supply loop is 250mA; voltage regulation accuracy and ripple/noise are both ±1%. |
| Input Parameters | Current input impedance: 500Ω; voltage input impedance: 4.3kΩ; maximum command current: 21mA; maximum command voltage: 11.0VDC; LVDT demodulator maximum input: 18Vpp (6.36Vrms); oscillator standard frequency: 1000Hz (error: ±10%). |
| Control Precision | Command input control precision: ±1%; feedback input precision: ±5%; response time: 50ms. |
| Temperature Range | Operating temperature: 0°C - 50°C; storage temperature: -40°C - 70°C. |
Core Features
Highly Adjustable Parameters: Supports zero point and full-scale adjustment of command inputs, as well as amplitude adjustment of LVDT modems. Proportional gain and integral time constants can be configured on demand to adapt to different working conditions.
Strong Compatibility: Compatible with various feedback components such as LVDTs and can interface with different types of servo mechanisms (pneumatic, hydraulic, etc.), meeting the diverse actuator control needs in industrial scenarios.
Safety & Reliability: Integrates multiple protection circuits (overload, overvoltage, overcurrent, etc.) and is equipped with external shutdown contacts. This effectively prevents equipment damage caused by abnormal working conditions and ensures stable system operation.
Application Scenarios
With its precise servo control capability, this control card is widely used in industrial sectors requiring high precision for actuator control. Typical applications include process control and safety interlock systems in the petrochemical industry, hydraulic mechanism control in power plants of the power generation sector, and precise regulation of production processes in the pharmaceutical industry. It is also compatible with servo equipment control scenarios in water treatment, mechanical processing, and other fields.
Customers who purchased this product are also browsing the following products:
BENTLY NEVADA 3701/44 175794-01 Turbine Monitor Module
FOXBORO RH916XZ Discrete Input Module
Bently Nevada 3500/42M-01-00 Proximitor Seismic Monitor
ABB 500TRM02 1MRB150011R0001 CONTROL CARD
3005319639