Product Information
Foxboro FBMSVH is a dedicated servo‑valve control card within the FBM series for the I/A Series DCS platform. It is a dedicated fieldbus module designed for electro‑hydraulic servo closed‑loop conditions, rather than an ordinary general‑purpose analog I/O card.
Integrated with LVDT excitation and demodulation circuits, servo‑valve power drive circuits and an on‑board PI control unit, the FBMSVH can directly receive commands from the host control system, acquire LVDT displacement feedback signals to complete closed‑loop valve‑position control, and is compatible with hydraulic servo actuators.
Data exchange between FBMSVH and the controller is realized via the I/A Series backplane bus. It is widely used for retrofitting high‑precision hydraulic regulation loops and spare‑part replacement in large‑scale industrial plants, and is frequently deployed in maintenance projects for legacy I/A systems.
Technical Specifications
Module Model: FBMSVHProduct Family: Foxboro I/A‑Series FBM Fieldbus Module
Drive Output: Bidirectional servo current output ±27 mA, maximum load 80 ΩFeedback Interface: On‑board LVDT excitation and signal demodulation processing circuitCommand Input: Analog control command input: 4‑20 mA, 0‑10 VDCLocal Algorithm: Built‑in PI closed‑loop regulation; proportional gain adjustable 0‑20, integral time adjustable 1‑20 s
Mounting: Installed in dedicated I/A‑Series FBM rack slot, requires separate terminal wiring unitCommunication: I/A Series backplane fieldbusOperating Environment: Operating temperature 0‑60 ℃, humidity 10‑90 % non‑condensingPhysical Dimensions: 140 mm × 110 mm × 32 mmModule Weight: Approx. 0.35 kgPower Supply: DC24 V powered via rack backplane
Product Features
The FBMSVH is dedicated hardware for servo closed‑loop control with fixed hardware architecture. It cannot be used as a general‑purpose replacement for standard AI/AO cards.
The module allows software configuration of PI parameters, LVDT measuring range and servo output limits, to accommodate different models of electro‑hydraulic servo valves.
Real‑time data exchange with I/A controllers is implemented through the backplane bus. Valve position, alarms and loop status can be uploaded to the host HMI.
Channel electrical isolation is adopted to mitigate the impact of field ground‑loop interference on displacement acquisition and servo output.
The card supports rack‑based hot‑swap. Module replacement can be performed without system shutdown to reduce plant downtime.
It fits legacy I/A hardware platforms and is incompatible with Compact200‑series FBM200 rack bases; hardware slots are not interchangeable.
Application Fields
Closed‑loop valve‑position control for hydraulic servo actuators in thermal power and cogeneration generating units
Electro‑hydraulic servo position regulation loops for metallurgical steel rolling production lines
High‑precision servo control for hydraulic test benches and fatigue‑testing equipment
Retrofit of I/A DCS systems for hydraulic governing mechanisms of large‑scale water turbines and steam turbines
Spare‑part replacement and system upgrade for hydraulic servo control systems in heavy‑duty equipment
Closed‑loop monitoring scenarios for hydraulic actuators of large‑scale units in petrochemical industry
Product Comparison
The FBMSVH is a dedicated module for servo‑valve plus LVDT closed‑loop control. FBM07, FBM202 and FBM222 are general‑purpose analog I/O modules, which only provide standard analog input and output. They lack LVDT demodulation, servo‑current drive and on‑board PI closed‑loop functions. Their hardware rack bases are incompatible and cannot directly replace the FBMSVH.
Standard AO cards of the FBM series only output voltage or 4‑20 mA standard signals and cannot supply ±27 mA bidirectional servo drive current. If a conventional analog output card is used to substitute the FBMSVH, the entire hydraulic servo closed‑loop loop will fail to operate properly. The FBMSVH is oriented toward motion‑oriented servo closed‑loop control, while other FBM I/O cards focus on conventional process‑parameter acquisition and regulation.
Compatible Products
Controllers: CP40B, FCP270, I/A‑Series Field Control ProcessorsRack Base: Dedicated I/A‑Series FBM rack, FBMSVH‑specific terminal wiring unitCommunication Module: FCM10E Fieldbus Communication ModulePower Unit: I/A‑Series rack‑mount DC24V power supply moduleField Sensors: Industrial LVDT displacement sensors, electro‑hydraulic servo valves
Operator Station: I/A‑Series operator workstation, ICC configuration tool software
FAQ
Q1: Can FBMSVH be directly used with FBM200‑series racks?A1: No. The FBMSVH belongs to the legacy I/A‑Series FBM hardware platform. Its physical slots are incompatible with Compact200 FBM200 racks. Corresponding legacy‑type FBM racks and terminal units must be adopted.
Q2: Can standard analog output cards directly substitute for FBMSVH?A2: No. Standard AO cards lack LVDT demodulation circuits, ±27 mA bidirectional servo‑current drive and on‑board PI closed‑loop calculation. Due to missing hardware functions, closed‑loop position control for hydraulic servo valves cannot be realized.
Q3: Does the FBMSVH module support hot‑swap?A3: It supports hot‑swap within FBM racks. FBMSVH can be replaced while the system remains operational. After replacement, PI parameters and LVDT calibration parameters shall be verified to prevent control anomalies.
Q4: What key information shall be confirmed when purchasing FBMSVH spare parts?A4: Confirm the existing I/A controller model, rack type, servo‑valve coil impedance, LVDT specifications, and configuration parameters stored in the original FBMSVH, to ensure proper adaptation to working conditions after replacement.
Q5: What are the common causes of valve‑position oscillation on FBMSVH?A5: It is mostly caused by improperly set PI gain parameters, loose LVDT wiring, on‑site electromagnetic interference, or servo‑valve load exceeding the maximum output load of FBMSVH. Troubleshoot parameters, wiring and field operating conditions item by item.
Q6: Is FBMSVH dependent on the host controller to run closed‑loop control?A6: No. FBMSVH features on‑board PI closed‑loop capability and executes local closed‑loop control upon receiving command signals. The controller is mainly responsible for set‑point transmission and alarm‑status acquisition.
Q7: Can FBMSVH accept thermocouple or RTD temperature signals?A7: Not supported. Designed as a servo closed‑loop control card, FBMSVH has no temperature‑signal processing channels. Dedicated FBM‑series analog‑input modules are required for temperature acquisition.
Q8: What is the typical lead‑time for FBMSVH delivery?A8: Shipment will be completed within 3‑7 working days if stock is available. When stock is tight, goods need to be sourced from alternative supplies, and the lead‑time shall be confirmed separately subject to supply sources.
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