Woodward 5441-693

3. Technical Specifications

• Official Part Number: 5441-693
• Rated Working Power Supply: 24 VDC, allowable input fluctuation range 18 VDC ~ 32 VDC; maximum overall operating power consumption 7.2 W
• Digital Input Configuration: Total 24-channel isolated DC digital input, rated input trigger voltage 24 VDC, input off-state threshold ≤5 VDC, input on-state threshold ≥18 VDC
• Relay Output Configuration: Total 12-channel Form C isolated relay output, single contact rated load: 10 A / 28 VDC resistive load, mechanical service life ≥10 million switching times per contact
• Communication Interface: Onboard dedicated internal backplane bus for data interaction with MicroNet main controller; reserved auxiliary RS485 debugging port conforming to Modbus RTU protocol for field parameter reading
• Galvanic Isolation Index: 1500 VDC isolation strength between input circuit, output relay circuit and internal core control circuit to block surge cross-circuit interference
• Operating Ambient Temperature Range: -20 ℃ ~ +70 ℃; storage environment temperature: -40 ℃ ~ +85 ℃
• Applicable Working Humidity: 5% ~ 95% relative humidity under non-condensing indoor cabinet environment
• Overall Outer Dimension: 105 mm (Width) × 35 mm (Thickness) × 120 mm (Depth); net single-unit weight: 420 g
• Mounting Standard: Comply with EN60715 standard 35 mm top-hat DIN rail fixed installation specification
• Enclosure Protection Grade: IP20, exclusively for indoor electrical cabinet closed installation

4. Functional Characteristics

1. Collect passive contact switching signals from field limit switches, pressure switches, temperature auxiliary contacts and generator auxiliary protection relays through 24 independent digital input channels, complete input signal filtering and level normalization processing inside module circuit.
2. Convert upper MicroNet main controller issued digital logic commands into mechanical relay contact on-off actions via 12 groups of isolated Form C relay outputs to drive field solenoid valves, auxiliary contactors and indicator lamps directly.
3. Independent RC filter circuit is configured for each input channel to suppress on-site power frequency clutter interference and eliminate false triggering caused by transient voltage burr of field wiring.
4. Onboard front panel independent LED status indicators for every input and output channel; input LED lights up when channel receives valid 24VDC trigger signal, output LED lights up synchronously with relay pull-in action.
5. Internal hardware-level signal interlock protection design avoids simultaneous short-circuit output of multi-channel relays under abnormal power fluctuation of field load circuit.
6. Transmit all collected input status and output feedback status data to MicroNet main controller via dedicated backplane bus in fixed 1 ms cyclic refresh cycle for upper system logic judgment and fault alarm processing.
7. Support offline channel single-point detection via RS485 debugging port, realize forced on/off control of any single output channel for pre-commissioning wiring verification work.

5. Performance Parameters

• Single channel input signal response delay: ≤2.5 ms from valid voltage access to internal signal latch completion
• Relay output action closing delay: ≤8 ms from command reception to contact mechanical pull-in stabilization
• Vibration resistance standard: Pass 10 Hz ~ 150 Hz random vibration test under 5g continuous acceleration without channel loose contact or component failure
• Impact resistance standard: 30g peak acceleration under running status, 50g peak acceleration under storage transportation status without internal circuit breakage
• Full-load continuous operation MTBF: ≥285000 hours under rated temperature and humidity working condition
• Channel crosstalk interference value: Zero valid signal error generated between adjacent input/output channels under full 24 input +12 output full-load running state
• EMC compliance standard: Conform to IEC61000-6-2 industrial anti-interference specification and IEC61000-6-3 electromagnetic emission control specification
• Input channel withstand overvoltage: Each input terminal can continuously bear 40 VDC transient overvoltage without internal circuit damage

6. Material Composition

1. Outer Module Housing: UL94-V0 flame retardant modified PA66 engineering plastic with anti-aging additive modification, integral injection molding structure
2. Core Main Circuit Board: High-Tg FR4 epoxy glass fiber flame retardant copper-clad substrate, all contact pads adopt immersion gold surface treatment with gold thickness ≥0.03 μm; all internal electronic components adopt full through-hole welding layout without SMD chip arrangement
3. Input/Output Terminal Spring Clamp: High-elasticity phosphor bronze alloy with nickel pre-plating + surface hard gold plating ≥0.4 μm for anti-oxidation and anti-loosening
4. Internal Isolation Components: High-reliability optocoupler chip and ceramic isolation capacitor to realize 1500VDC electrical isolation between different functional areas
5. Built-in Electromagnetic Relay: Silver alloy contact relay with epoxy sealed housing, internal coil wound with high-temperature enameled copper wire
6. DIN Rail Fixed Buckle: Glass fiber reinforced PA66 plastic integrated injection molding component with high mechanical fatigue resistance
7. Internal Fixed Fasteners: SUS304 stainless steel miniature anti-rust positioning screws and insulating plastic spacer

7. Structural Features

1. Integral split three-section structure including front indicator terminal panel, middle main PCB control circuit board and rear DIN rail fixed buckle component, all parts locked into an integral whole via four positioning screws.
2. Front panel centralized layout: upper area arranged with 24-channel digital input terminal blocks and corresponding input status LED, lower area arranged with 12-channel relay output terminal blocks and matched output status LED, RS485 debugging jack reserved on the right side of front panel.
3. Internal PCB partition zoning layout: independent separated regions for input signal conditioning area, relay drive power area, core bus logic control area to realize physical separation of strong-current output circuit and weak-current input signal circuit for anti-interference optimization.
4. Rear side integrated elastic clamping DIN rail buckle structure, buckle opening and closing controlled by embedded plastic toggle for rapid disassembly from standard DIN rail without extra tools.
5. Independent closed plastic isolation baffle between input optocoupler group and output relay group to block internal electromagnetic radiation mutual interference.
6. All wiring terminals adopt spring-type quick wiring structure without screw locking, support direct insertion of 0.5~2.5 mm² single-strand copper wire for on-site rapid wiring construction.

8. Working Principle

9. Advantage Highlights

1. Original Woodward factory OEM standardized accessory with complete batch production traceability, direct seamless docking with all Woodward MicroNet series main control units without extra adapter conversion module.
2. Full-channel hardware electrical isolation design completely isolates field-side surge voltage and interference clutter from upper core control system, effectively avoiding main control board damage caused by field wiring short-circuit fault.
3. Fixed 24DI+12DO unified channel configuration realizes standardized cabinet layout for generator and turbine control system, reducing spare part stocking variety and on-site inventory cost.
4. Full through-hole component circuit layout improves module anti-vibration performance, adapting to long-term vibration environment of on-site engine room and compressor station equipment.
5. Front panel full-channel LED real-time status display shortens field fault point location time and reduces equipment downtime during routine maintenance.
6. Comply with global mainstream industrial safety certification standards, can be directly matched for power generation equipment exported to European, American and Southeast Asian markets without additional certification modification.

10. Applicable Industries

• Thermal Power & Cogeneration Power Generation Industry: Steam turbine/genset auxiliary protection signal collection and auxiliary actuator drive control
• Oil & Gas Exploitation Industry: Oilfield compressor unit, gas gathering station turbine control cabinet discrete signal acquisition
• Petrochemical Refining Industry: Refinery process gas turbine, high-pressure compressor safety interlock control system
• Biogas & Distributed New Energy Power Industry: Distributed diesel/gas generator set parallel cabinet signal matching
• Marine Power Equipment Industry: Ship main diesel engine auxiliary monitoring and control cabinet signal expansion
• Industrial Central Air Compressor Station Industry: Large reciprocating/screw compressor safety interlock and auxiliary equipment control

11. Applicable Model Series

• Matching Main Control Series: Full Woodward MicroNet family main controller including 505, 5500, NetCon series turbine/generator governors
• Peer Product Series of Same Lineup: Woodward 5441-691, 5441-692, 5441-694 multi-spec MicroNet I/O modules with different channel allocation
• Supporting Field Auxiliary Parts: Woodward matched standard wiring terminal row, DIN rail mounting accessories and dedicated communication backplane connectors

12. Installation Requirements

1. Select indoor IP30 and above closed electrical cabinet internal installation position, reserve minimum 40 mm upper and lower ventilation gap around module body for natural heat dissipation, forbid fully sealed enclosed installation without air circulation space.
2. Snap rear elastic buckle onto standard 35 mm EN60715 DIN rail horizontally, toggle buckle switch to lock module tightly on rail and confirm no loose shaking under slight cabinet vibration.
3. Complete all field input/output wiring operation under full power-off status of module and matched MicroNet main controller; insert field signal wire into corresponding spring terminal hole and lock wire via terminal built-in spring structure, avoid bare copper wire exposure outside terminal.
4. Connect 24VDC working power line to dedicated module power terminal strictly following positive and negative polarity definition, forbid reverse power access to prevent internal circuit burnout.
5. Insert module backplane bus connector into MicroNet rack backplane slot vertically after wiring completion, lock front panel fixing screws with 0.5 N·m standardized tightening torque.
6. Complete single-channel point-by-point wiring verification via RS485 debugging port before system overall power-on, execute input trigger test and output forced action test sequentially before formal equipment startup operation.

13. Usage Precautions

1. Strictly prohibit hot plugging/unplugging of module from MicroNet main rack backplane under powered running state to avoid instantaneous surge current damaging internal core logic chip and backplane bus circuit.
2. Prevent conductive metal scrap, engine oil, cutting fluid and corrosive chemical liquid splashing onto module front panel and wiring terminal area; cut off module input power supply immediately once liquid infiltration occurs and place module in dry constant-temperature environment for 72-hour drying maintenance before repower test.
3. Do not connect field load exceeding single relay rated 10A/28VDC load parameter onto output terminals, overload load will lead to relay contact ablation and permanent channel failure.
4. Conduct quarterly routine maintenance inspection: check terminal wiring fastening status, LED indicator working state, cabinet internal dust accumulation thickness, record all inspection data into equipment maintenance log.
5. Store spare unused modules inside original factory anti-static sealed packaging box under 15 ℃~25 ℃ dry indoor environment, forbid long-term outdoor storage under direct sunlight, damp high-temperature or rain immersion environment.
6. Keep module external field signal wiring separated from high-voltage power cable with minimum 12 cm wiring spacing to reduce power frequency electromagnetic interference leading to input channel false trigger fault.