Description
BRAUN E1667.111
Technical Specifications:
- Input: Magnetic pick-up sensor pulse input
- Frequency Measurement Range: 0 Hz to 50 kHz
- Measurement Accuracy: ±0.005% of reading
- Power Supply: Universal power input 20 to 265 V AC/DC
- Analog Output: 4-20mA proportional to rotational speed
- Relay Outputs: Safety trip relay and alarm relay contacts
- Communication: RS232 or PROFIBUS serial interface
- Operating Temperature: -10°C to +60°C
- Storage Temperature: -40°C to +85°C
- Safety Level: SIL2 compliant
Function Features:
- High precision rotational speed calculation from magnetic pick-up pulse signals
- Rotation direction detection and standstill monitoring
- Three programmable speed setpoints for overspeed trip, warning and underspeed alarm
- Built-in sensor cable break and short circuit diagnosis
- Continuous self-test of internal measurement circuitry
- 4-20mA analog output for speed value transmission to DCS/PLC
- Relay contact outputs for hardwired trip and alarm logic
- Fast response time for critical machinery overspeed protection
Application Scenarios:
- Gas and steam turbine overspeed protection systems
- Centrifugal compressor speed monitoring
- Generator rotating machinery protection
- Petrochemical plant rotating equipment safety monitoring
- Power plant turbine protection rack spare replacement
Material Composition:
- Substrate: Multilayer FR4 fiberglass printed circuit board
- Core Components: Pulse counting logic chips, precision timing quartz oscillator, relay drivers
- Relays: Safety rated electromechanical relays
- Connectors: Gold-plated rack edge connectors for backplane connection
- Housing: Metal rack card front panel with status LEDs
Structural Features:
- Standard rack plug-in card design for chassis installation
- Front panel with red LED digital speed display and status LEDs
- Edge connector for backplane signal and power connection
- Metal front panel for electromagnetic shielding
- Push-fit card locking mechanism for rack mounting
Working Principle: Magnetic pick-up sensor generates pulse signals proportional to rotating speed. The module counts pulse intervals using high precision quartz timing circuit and calculates RPM value. Internal logic compares measured speed against three programmable setpoints. When speed exceeds trip threshold, safety relay contact changes state to trigger machine trip. Sensor fault detection monitors input signal integrity and triggers alarm for open or shorted sensor wiring. 4-20mA analog signal sends speed value to upper control system.
Installation Requirements:
- Insert module into dedicated BRAUN E16 series rack chassis
- Wear anti-static wristband during handling and replacement
- Verify backplane connector cleanliness before insertion
- Use shielded twisted pair cable for magnetic pick-up sensor wiring
- Separate sensor signal cables from high voltage power cables
- Implement reliable rack protective grounding
Usage Notes:
- Program speed setpoints and hysteresis parameters before machinery commissioning
- Perform function test of overspeed trip circuit during plant outage
- Do not exceed rated input frequency range
- Inspect gold-plated edge connectors for dust and corrosion periodically
