Core Functions

1. Triple‑channel independent speed measurement via Magnetic Pickup (MPU), 2‑out‑of‑3 voting logic for high safety integrity

2. Overspeed, over‑acceleration detection and hardwired trip relay output for emergency shutdown

3. Real‑time speed display, trip event recording, fault self‑diagnosis and alarm logging

4. Dual power supply input (24 VDC + high‑voltage AC/DC), redundant power backup

5. Modbus‑RTU communication for remote monitoring, parameter configuration and system integration

6. Panel‑mount human‑machine interface with LCD display and keypad for on‑site operation

Technical Specifications

• Voting Architecture: 2‑out‑of‑3 triple modular redundant (TMR)

• Speed Input: Magnetic Pickup (MPU), frequency range 0–25 000 Hz

• Power Supply: Low‑voltage: 24 VDC (18–32 VDC); High‑voltage: 115/240 VAC / 125 VDC

• Trip Output: Dual redundant safety relays, dry contact shutdown signal

• Communication: RS‑485 Modbus‑RTU

• Accuracy: Speed measurement ±0.05% full‑scale

• Operating Temperature: −20 °C ~ +60 °C

• Storage Temperature: −20 °C ~ +65 °C

• Protection Grade: Front panel IP56

• Dimensions: 330 × 445 × 159 mm (13 × 17.5 × 6.25 in)

• Weight: Approx. 10 kg (22 lb)

• Certifications: ATEX II 3G, IECEx, UL Class I Div 2 hazardous area approved

Mechanical & Environmental Features

• Mounting: Front panel‑mount for control cabinet installation

• Enclosure: Rugged metal housing, dust‑proof, moisture‑proof, vibration‑resistant

• Hot‑swappable modules for online maintenance without system shutdown

• Conformal‑coated circuit board for harsh industrial environments

Typical Applications

• Gas/steam turbine overspeed safety protection in thermal power plants

• Oil‑gas compressor and large reciprocating engine safety shutdown system

• Hydroelectric turbine speed monitoring and protection

• Offshore platform and marine prime mover overspeed control