Description
MRN3-11D is an independent dual-channel overspeed safety protection module specially designed by Woodward for gas turbines, steam turbines, and diesel/gas generator sets. It is independent of the main speed control controller and serves as a second mechanical overspeed electronic protection measure. It meets the SIL safety protection standards for power plants and offshore platforms, preventing the unit from overspeeding and damaging the core equipment.
Core Product Specifications
- Brand: Woodward
- Model: MRN3-11D
- Availability: In Stock
- Delivery Time: Within 3 working days after payment confirmation
- Guarantee: 12 months warranty
- Condition: Brand New Original
Electrical Parameters
- Auxiliary Power: 24VDC wide voltage (18~32VDC)
- Speed Input: 2-channel redundant magnetic pickup sensor input, signal range 0.5–32 Vrms
- Speed Measuring Range: 0~10000 RPM
- Overspeed Trip Threshold: Adjustable 105%~120% rated speed
- Response Time: ≤20ms ultra-fast trip output
- Relay Output: Dual independent trip relays (250VAC / 10A contact capacity)
- Communication: Optional RS485 Modbus RTU for remote monitoring & fault upload
Mechanical & Environment
- Mounting: Standard DIN 35mm rail cabinet installation
- Operating Temperature: -40℃ ~ +70℃
- Protection Class: IP20 cabinet internal type; explosion-proof variant MRN3-11D-Ex (Ex d IIB T4, IP65)
- Dimension: Compact industrial housing, low cabinet space occupation
Key Features & Advantages
- Dual Redundant Speed Channel Design, High Safety Reliability
Two independent magnetic pickup signal acquisition circuits, logic voting judgment to avoid single sensor open/short circuit causing false trip or protection failure; independent hardware circuit separate from main governor, form redundant overspeed protection system, meet API 670 and SIL2 safety requirements.
- Independent Emergency Shutdown Protection Logic
Operates completely independent of main speed controller. Once rotational speed exceeds set threshold, instantly drives fuel cut-off solenoid and unit trip circuit, fast response prevents turbine/engine overspeed damage.
- Multi-Stage Configurable Alarm & Trip Logic
Support separate pre-overspeed warning relay + final emergency trip relay; threshold, delay time freely set via front potentiometer or PC configuration software, adapt steam turbine, gas turbine, diesel generator different protection standards.
- Complete Real-Time Self-Diagnosis Function
Continuously monitor sensor wiring break, signal loss, internal power supply abnormal; front panel LED indicators display power, channel signal, overspeed alarm, trip status, quickly locate on-site faults without extra test tools.
- Wide Industrial & Marine Environmental Adaptability
Wide temperature, anti-vibration, anti-EMI design; explosion-proof version available for oil & gas hazardous Zone1/Zone2 production sites.
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