Product Description

Overview

The A6220 module from EPRO (also known as MMS 6220) is a precision dual-channel shaft eccentricity monitor within the MMS 6000 Series. It is designed for early detection of shaft bow or bending during startup and shutdown phases in large turbomachinery. By measuring radial displacement with high accuracy, the A6220 ensures safe operation and protects critical machinery from bearing or seal contact caused by shaft eccentricity.

Key Features

• Dual independent measurement channels for redundant or multi-point monitoring

• Optimized for very low rotational speeds (0.017 Hz to 70 Hz / 1–4200 RPM)

• Peak-to-peak shaft displacement measurement to quantify eccentricity

• Run-up/Run-down memory storing maximum shaft displacement for trend analysis

• Microprocessor-based signal conditioning and linearized output

• Continuous sensor and cabling health monitoring with “OK Logic” relay

• Redundant power supply support for uninterrupted monitoring

• Analog 0/4–20 mA outputs proportional to shaft displacement

• Front-panel SMB connectors for raw signal diagnostics

• RS-232 and RS-485 digital communication interfaces for local and network integration

• LED indicators for “Run,” “Sensor OK,” and alarm/trip status

Technical Specifications

Applications

• Turbine startup: Ensures shafts clear critical resonance speeds without internal contact

• Turning gear monitoring: Prevents thermal bow during slow shaft rotation

• Machinery health diagnostics: Tracks long-term eccentricity trends to detect misalignment, sag, or deformation

• SIL-rated safety monitoring environments for critical machinery

FAQ

Q: Why is shaft eccentricity monitoring critical?
A: Eccentricity measures radial displacement caused by thermal sag or bow. High eccentricity at startup or high speed can damage bearings or seals.

Q: Can the A6220 monitor multiple shaft locations?
A: Yes, dual channels allow independent monitoring at two locations or redundant measurements at a single location.

Q: How does it prevent false alarms?
A: Continuous sensor and cable monitoring (“OK Logic”) ensures alarms trigger only when true shaft issues are detected.

Q: Is it compatible with other MMS 6000 modules?
A: Yes, it integrates fully with MMS 6000 system racks and configuration software for centralized monitoring.