Description
Product Overview
The Emerson A6120 (EPRO) is a 3U single-slot plug-in TSI protection module for AMS 6500 / CSI 6500 Machinery Health Monitor rack system. This dual-channel seismic vibration monitor measures absolute bearing housing vibration (case velocity) using electro-dynamic velocity transducers. It provides continuous machinery protection for steam turbines, gas turbines, centrifugal compressors, hydro turbines and large critical pumps in power generation, oil & gas and petrochemical facilities. The module complies fully with API 670 for turbomachinery protection, offering configurable alarm and trip relay outputs for safety interlock.
Technical Specifications
| Item | Parameter |
|---|---|
| Part Number | A6120 |
| Manufacturer | Emerson Automation Solutions (EPRO) |
| Series | AMS 6500 / CSI 6500 |
| Product Type | Dual Channel Case Seismic Vibration Monitor |
| Channels | 2 independent differential galvanically isolated input channels |
| Supported Sensors | EPRO electro-dynamic velocity sensors: PR9266, PR9267, PR9268 |
| Measurement Parameter | Vibration velocity (mm/s RMS or in/s RMS) |
| Frequency Band | Low cutoff:1Hz /5Hz selectable; High cutoff 50~2000Hz adjustable |
| Measurement Range | Software configurable 5–100 mm/s RMS |
| Accuracy | ±0.5% full scale |
| Galvanic Isolation | Channel-to-backplane isolation |
| Power Supply | 24 VDC ±10%, max 6W |
| Form Factor | 3U Eurocard single slot, DIN41494 |
| Dimensions | 30(W) ×128.4(H) ×160(D) mm |
| Weight | ~300g |
| Analog Output | 0/4–20mA or 0–10V buffered proportional output, front and rear terminals |
| Front Panel | SMB buffered raw signal, LED health / alarm / trip indicators |
| Remote Function | Remote trip bypass and limit multiply function |
| Operating Temp | 0°C ~ +60°C |
| Storage Temp | -40°C ~ +85°C |
| Humidity | 5–95% non-condensing |
| Certifications | CE, UL, API 670 compliant |
| Hot Swap | Yes |
Key Features
- Dual independent differential input channels for bearing housing absolute seismic vibration monitoring, measuring velocity of machine casing.
- Designed for electro-dynamic velocity transducers PR9266 / PR9267 / PR9268, built-in sensor lifting coil excitation.
- Continuous onboard diagnostics for transducer open circuit, short circuit, cable failure and module hardware faults.
- Configurable Alert and Danger trip thresholds with adjustable time delay and hysteresis to prevent nuisance trips during machine transients.
- Front and rear buffered analog outputs (4–20mA / 0–10V) to transmit real-time vibration values to DCS/SCADA.
- Remote trip bypass and limit multiply capability, supporting maintenance proof testing without disabling full rack protection.
- Hot-swappable 3U Eurocard design for online replacement under controlled maintenance procedures without rack shutdown.
- Configuration, calibration and diagnostics via AMS 6500 configuration software with password protection.
Installation Notes
- Install only in Emerson AMS6500 19-inch rack, confirm firmware compatibility with existing rack processor.
- Pair with EPRO PR9266, PR9267 or PR9268 electro-dynamic seismic velocity sensors.
- Separate low-level transducer signal wiring from high-power AC cables to minimize EMI interference.
- Wear ESD wrist strap during handling to avoid static damage to PCB electronics.
- Follow plant lockout/tagout procedures even for hot-swap maintenance work.
- After module replacement, perform sensor calibration, loop test and vibration protection proof test before returning rotating equipment online.
- Set alarm and trip parameters strictly following machine OEM protection specifications.
Testing Procedure
- Visual inspection: Inspect front panel LEDs, PCB and edge connector for scratches, bent pins or corrosion.
- Insert A6120 module into AMS6500 rack, apply 24VDC rack power and confirm power-up self-test passes.
- Connect vibration signal simulator to both input channels.
- Simulate different vibration velocity values, verify readings inside AMS6500 software and analog output terminals.
- Simulate transducer open/short faults to validate module diagnostic alarms trigger correctly.
- Test alert and danger trip relay functions, verify threshold hysteresis and time delay settings.
- Save configuration backup, record calibration data and tag module for spare inventory.
FAQ
Q: What is Emerson A6120 used for? A: It is dual-channel seismic vibration TSI monitor, used for bearing housing absolute vibration velocity monitoring and machinery protection for turbines and compressors.
Q: What sensors are compatible with A6120? A: EPRO PR9266, PR9267, PR9268 electro-dynamic velocity seismic transducers.
Q: Is A6120 hot swappable? A: Yes, hot swap is supported on AMS6500 racks under approved site maintenance procedures.
Q: What is the difference between A6120 and A6125? A: A6120 is for electro-dynamic velocity sensors; A6125 is designed for piezoelectric accelerometer inputs.
Start Chat
Send an Email
