Description
Product Overview
The Emerson A6220 (EPRO) is a 3U single-slot plug-in TSI module designed for AMS 6500 / CSI 6500 Machinery Health Monitor rack system. This dual-channel eccentricity monitor tracks shaft bow and slow-roll eccentricity on large steam turbines, gas turbines and high-speed rotating machinery, especially critical during turning gear, startup and warm-up phases. It interfaces with EPRO eddy current proximity probes (PR642x series), filters high-frequency vibration and extracts low-speed shaft eccentricity measurements to prevent rub damage. The module complies with API 670 for machinery protection, providing configurable alarm and trip outputs for safety interlock.
Technical Specifications
| Item | Parameter |
|---|---|
| Part Number | A6220 |
| Manufacturer | Emerson Automation Solutions (EPRO) |
| Series | AMS 6500 / CSI 6500 |
| Product Type | Dual Channel Shaft Eccentricity Monitor |
| Channels | 2 independent eddy current input channels |
| Supported Sensors | EPRO PR6422, PR6423, PR6424, PR6425 eddy current proximity probes |
| Measurement Bandwidth | 0.017 Hz ~ 70 Hz (1 ~ 4200 rpm) |
| Input Signal | -1 V ~ -23 V DC probe signal |
| Accuracy | ±1% of full scale |
| Galvanic Isolation | Channel-to-backplane isolation |
| Power Supply | 24 VDC ±10%, max 5W |
| Form Factor | 3U Eurocard single slot |
| Dimensions | 30(W) ×128.4(H) ×160(D) mm |
| Weight | ~300g |
| Analog Output | 0/4–20mA or 0–10V buffered proportional output |
| Front Panel Signal | SMB buffered raw signal for test / diagnostics |
| 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 channels for shaft eccentricity and slow roll monitoring, focused on low-speed turbine startup conditions.
- Native interface for EPRO eddy current proximity probes, measuring shaft bow to detect thermal bending before turbine acceleration.
- Built-in sensor diagnostics for probe open circuit, short circuit and cable fault detection.
- Configurable alert and danger trip thresholds with adjustable time delay and hysteresis for machinery protection logic.
- Buffered analog outputs (4–20mA / 0–10V) for transmitting eccentricity values to DCS or SCADA systems.
- Front-panel SMB test port for technicians to capture raw probe signal without disturbing field wiring.
- Hot-swappable 3U Eurocard design, allowing replacement during rack online operation with controlled maintenance procedures.
- Setup and diagnostics managed via AMS 6500 configuration software, password protected to prevent unauthorized changes.
Installation Notes
- Install only in Emerson AMS6500 19-inch rack, confirm firmware compatibility with existing rack processor.
- Pair with EPRO PR642x series eddy current probes and matching extension cables for eccentricity measurement.
- Separate low-level proximity probe signal wiring from high-power AC cables to reduce EMI interference.
- Use ESD wrist strap when handling the Eurocard module to avoid static damage to PCB components.
- Follow plant lockout/tagout procedures even during hot-swap maintenance.
- After module replacement, perform probe gap calibration, loop test and protection trip proof test before turbine startup.
- Set proper alarm/trip limits in AMS 6500 software according to turbine OEM specifications.
Testing Procedure
- Visual inspection: Inspect front panel, PCB, edge connector for cracks, bent pins or corrosion.
- Insert A6220 module into AMS6500 rack, apply 24VDC rack power and confirm power-up self-test passes.
- Connect eddy current probe simulator to both input channels.
- Simulate different shaft gap/eccentricity values, verify readings in AMS 6500 software and analog output terminals.
- Simulate probe open/short faults to confirm module diagnostic alarms activate correctly.
- Validate alert and danger trip 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 A6220 used for? A: It is a dual-channel shaft eccentricity monitor for AMS6500 TSI systems, measuring shaft bow and slow roll eccentricity during turbine turning gear and startup.
Q: What sensors work with A6220? A: EPRO PR6422, PR6423, PR6424, PR6425 series eddy current proximity probes.
Q: Is A6220 hot swappable? A: Yes, it is hot-swappable in AMS6500 racks, under approved site maintenance procedures.
Q: What is the frequency range for eccentricity measurement? A: 0.017 Hz to 70 Hz, optimized for low-speed slow roll and startup monitoring.
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