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The A6220 is a high-precision vibration acquisition module designed for the Emerson AMS 6500 and MMS 6000 machinery protection systems. It specializes in measuring eccentricity, a key parameter for monitoring the shaft's mechanical bow or thermal distortion...
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The A6220 is a high-precision vibration acquisition module designed for the Emerson AMS 6500 and MMS 6000 machinery protection systems. It specializes in measuring eccentricity, a key parameter for monitoring the shaft's mechanical bow or thermal distortion (runout) during startup and shutdown of large-scale steam and gas turbines. The A6220 ensures that the rotor remains sufficiently straight before the turbine reaches operational speeds, preventing catastrophic damage like blade-to-casing contact caused by uneven thermal expansion.
The module processes signals from dual eddy current (proximity) probes to provide peak-to-peak displacement data. It is crucial for Turning Gear and Warm-up monitoring, filtering out high-frequency noise and focusing on the low-speed rotational dynamics essential during turbine warm-up phases.
| Specification | Details |
|---|---|
| Model Number | A6220 |
| Primary Function | Dual-Channel Eccentricity / Slow-Roll Vibration Monitoring |
| Input Configuration | 2 independent eddy current sensor inputs |
| Measurement Type | Peak-to-Peak displacement (mils or microns) |
| Frequency Range | 0.1 Hz to 200 Hz (Optimized for low-speed rotation) |
| Internal Processing | Automatic peak-to-peak detection and linearization |
| System Bus | Integrated AMS 6500 / MMS 6000 backplane interface |
| Buffered Outputs | Dual front-panel SMB/BNC connectors for portable data collectors |
| Isolation | Galvanic isolation between field inputs and logic circuits |
| Status Indicators | Front-panel LEDs for Channel OK, Alert, and Danger status |
| Dimensions | 3.1 cm x 19.0 cm x 12.8 cm |
| Weight | 0.3 kg |
The A6220 is primarily used in utility-scale power generation during the Turning Gear operation. It ensures that the rotor does not develop a temporary bow after a hot trip. If eccentricity exceeds predefined limits, the module triggers interlocks to prevent the turbine from accelerating, protecting critical components like thrust bearings and internal seals.
How does eccentricity monitoring differ from standard vibration monitoring?
Standard vibration monitoring measures high-frequency dynamic motion, while the A6220 focuses on low-speed shaft bow (static-like displacement) at very low RPMs. This is essential during turbine warm-up or slow-roll operations where traditional vibration modules may filter out low-frequency signals as noise.
Can this module be used for standard radial vibration?
While the A6220 shares some hardware similarities with the A6110 radial vibration module, it is specifically tuned and optimized for eccentricity monitoring. For high-speed radial vibration, the A6110 is the recommended module.
Are the sensors powered by the module?
Yes, the A6220 provides the necessary negative voltage (typically -24VDC) to power standard Emerson/ePRO proximity transducers.
