Product Core Brief
- Model: A6220 (Part: 9199-00009)
- Brand: Emerson (CSI / AMS 6500 Series)
- Core Function: Monitors shaft eccentricity (rotor bow) to prevent catastrophic rubbing during turbine startup, cooldown, and slow-roll operations.
- Product Type: Dual-Channel Shaft Eccentricity Monitor Module
- Key Specs: Dual-Channel | Eddy Current Input | API 670 Compliant | Hot-Swappable | 3U Form Factor
- Condition: New Original / New Surplus
EMERSON A6220
Product Introduction
The EMERSON 9199-00009 is a specialized dual-channel monitor module designed for the AMS 6500 Mechanical Health Monitor. It is engineered to measure shaft eccentricity (also known as rotor bow or shaft bend) in critical rotating machinery, particularly large steam and gas turbines.
Eccentricity monitoring is vital during startup and shutdown phases. If a turbine rotor has excessive bow due to thermal gradients or improper turning gear operation, starting the machine can cause severe rotor-to-stator contact. The continuously calculates the peak-to-peak eccentricity from dual proximity probe inputs and compares it against user-programmable alarm setpoints. It ensures the rotor is within safe mechanical limits before allowing the unit to roll or accelerate.
Compliant with API 670 standards, this hot-swappable 3U module integrates seamlessly with DeltaV and Ovation process automation systems, providing essential protection logic for safe turbine operation.
Key Technical Specifications
- Module Type: Dual-Channel Shaft Eccentricity Monitor
- Form Factor: 3U, 1-Slot Plug-in Module
- Supported Sensors: Non-contact Eddy Current Proximity Probes
- Measurement: Peak-to-Peak Eccentricity (Rotor Bow)
- Compliance: API 670 (Machinery Vibration Monitoring)
- Outputs: Alarm Setpoint Relays, 4-20mA / Digital Signals
- Software Integration: AMS Machinery Manager, DeltaV, Ovation
- Features: Hot-swappable, Dual-channel averaging or independent monitoring
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: Verify part number 9199-00009 and model . Inspect the rear Euro-connector and front panel status LEDs for physical damage.
- Visual Inspection: Check the PCB for corrosion, flux residue, or signs of overheating. Ensure the module slides smoothly into the AMS 6500 chassis.
- Live Functional Test: Install in the AMS 6500 rack. Verify the module is recognized by the AMS software and the “OK” LED illuminates.
- Signal Path Test: Inject simulated dual-channel eddy current signals with a known phase difference. Verify the module correctly calculates eccentricity and triggers alarms at configured setpoints.
- Final QC & Packaging: Seal in an anti-static bag. Apply a QC Passed label with the date.
EMERSON A6220
Replacement Pitfall Guide
❗ Eccentricity vs. Vibration: Do not confuse the with standard vibration modules (e.g., A6110). The is specifically designed for low-speed eccentricity calculations. Using a standard vibration module for eccentricity protection will result in incorrect readings and potential machine damage.
❗ Dual-Channel Requirement: Eccentricity measurement typically requires two proximity probes mounted 90° or 180° apart (depending on the calculation method). Ensure both sensor channels are wired and configured correctly in the AMS software.
❗ Sensor Gap & Sensitivity: Eccentricity calculations are highly sensitive to sensor gap and system sensitivity. Verify that the probe calibration and gap voltage match the module’s configuration parameters. Incorrect gaps will cause false eccentricity readings.
❗ Startup Interlocks: This module is often tied to critical startup permissives in the DCS/Turbine Control System. Before replacing, verify that the bypass or maintenance mode is correctly set in the control logic to prevent spurious trips or blocked startups.
❗ Hot-Swapping Safety: While the module is hot-swappable, always verify that the specific eccentricity protection channels are bypassed or safely managed in the turbine control logic before removal.
Compatibility Matrix & Benchmarks
- → A6110 : Complementary — Use A6110 for standard shaft relative vibration monitoring alongside eccentricity.
- → A6312 : Complementary — Pair with Speed/Keyphasor module to correlate eccentricity with rotor position and speed.
- → A6630 : Complementary — Pair with RTD module to monitor bearing/casing temperature during thermal bow events.
- → AMS 6500 Chassis : System — Requires standard AMS 6500 backplane and power supply.
Benchmarks:
- Measurement Accuracy: High-precision eccentricity calculation for slow-roll protection
- Response Time: Fast relay output for startup interlock logic
- Space Efficiency: 3U form factor saves cabinet space vs. legacy 6U cards
Need me to pull up the matching A6312 Speed/Keyphasor Module or the A6110 Shaft Vibration Module to complete your turbine protection setup? Let me know which one you’d like.
