Key Technical Specifications
| Parameter | Specification |
|---|---|
| Full Model | A6220 |
| OEM Part Reference | 9199-00009 (shaft eccentricity monitor) |
| Manufacturer | Emerson / EPRO |
| Product Family | AMS 6500 machinery protection monitors |
| Module Type | Shaft eccentricity monitor |
| Channels | 2 independent channels |
| Mechanical Format | 3U, 1-slot plug-in module |
| Standards Alignment | API 670 machinery protection compatibility |
| Hot-Swap | Supported |
| Analog Outputs | Buffered/proportional 0/4-20 mA and 0-10 V |
| Alarm/Trip | Relay outputs driven by configured setpoints |
| Compatible Sensors | EPRO displacement probes 6422, 6423, 6424, 6425 and associated drivers |
| Diagnostics | Hardware self-check, power input monitoring, temperature monitoring, sensor/cable monitoring |
| Remote Functions | Remote limit multiplication and trip bypass selection |
| Power Supply | Verify on nameplate; some listings cite 220 V AC, but this must be confirmed before installation |
| Replacement Status | Obsolete; verify firmware/revision compatibility with existing AMS 6500 rack |
Product Introduction
If you are still running an AMS 6500 rack on a steam turbine or compressor train, the A6220 is one of those cards you do not want to find dead during a startup. It is not a generic analog input card. It is a shaft eccentricity monitor, and it sits in the machinery protection chain where false trips and missed trips both hurt.The A6220 gives you two monitored channels, buffered analog outputs, relay trips, and self-diagnostics that actually cover the sensor and cable side — not just the module itself. That matters when a probe cable gets oil-soaked, a connector works loose, or a prox probe drifts after maintenance. It fits into the 3U AMS 6500 architecture and plays well with keyphasor, vibration, and process-input modules. Just do not treat it like a plug-and-play I/O card. Sensor type, gap voltage, setpoints, and bypass logic all need to match the machine protection philosophy.
Quality SOP & Tech Pitfalls
The Lab Report (SOP)
We start with a visual check: nameplate, part number 9199-00009, serial number, connector pins, front-panel condition, and any signs of rework. Then it goes into a compatible AMS 6500 test rack for live power-up, channel verification, analog output checks, relay trip verification, and diagnostic status review. We confirm the module is recognized by the rack, log any firmware/revision markings, and verify that sensor fault indications behave correctly. Final steps are insulation/continuity checks where appropriate, anti-static packaging, and reinforced shipping. Test photos and a basic test report can be provided.The Engineer’s Warning (Pitfalls)
- Wrong probe pairing kills accuracy. The A6220 is meant for shaft eccentricity using compatible EPRO displacement probes and drivers. Feeding it the wrong sensor type or mismatched driver will give you garbage readings.
- Do not ignore the bypass/limit settings. Remote limit multiplication and trip bypass are useful, but if they are left in the wrong state after a swap, you either lose protection or create an nuisance trip.
- Power supply must be verified. Some sources mention 220 V AC, but you must read the actual nameplate before wiring. Putting the wrong supply on a 3U monitor module is a fast way to smoke it.
- Hot-swap is not “no planning.” Yes, it supports hot replacement, but you still need to confirm bypass status, relay states, and DCS/annunciator behavior before pulling the old card.
Installation & Configuration Guide
- Pre-Installation
- Notify operations and confirm the machine protection strategy.
- Photograph the existing module: label, setpoints, bypass status, relay assignments, and alarm indications.
- Verify probe type, driver module, and cable condition.
- Removal
- ⚠️ Confirm trip bypass or maintenance mode per site procedure.
- Label all sensor and output connections.
- Remove the module carefully and place it in an anti-static bag.
- Installation
- Verify the replacement A6220 nameplate matches 9199-00009 and the required revision.
- Confirm power supply rating before energizing.
- Seat the module firmly into the AMS 6500 rack.
- Reconnect probes, analog outputs, and relay wiring exactly as labeled.
- Power-On & Testing
- Check module power and diagnostic LEDs/display.
- Verify sensor fault indication with a known-good probe or simulator.
- Confirm 0/4-20 mA and 0-10 V outputs track correctly.
- Test alarm and trip relays under controlled conditions.
- Remove bypass only after all readings and outputs are verified.
Compatible Replacement Models
| Replacement | Compatibility | Notes |
|---|---|---|
| Emerson/EPRO A6220 (9199-00009) | ✅ Drop-in | Same module. Match revision, setpoints, and sensor configuration. |
| AMS 6500 updated monitor module | ⚠️ Engineering review | Emerson may have updated AMS 6500 modules. Confirm slot compatibility, sensor support, and configuration migration. |
| Third-party API 670 monitor | ❌ Not a direct swap | Would require rewiring, reconfiguration, and possible rack changes. Treat as a system upgrade, not a spare swap. |
Frequently Asked Questions (FAQ)
Is the A6220 a vibration module or an eccentricity module?
It is a shaft eccentricity monitor. It belongs to the AMS 6500 family alongside vibration, speed/keyphasor, and process-input modules, but its primary job is eccentricity.Can I hot-swap it safely?
The module is listed as hot-swappable, but you must follow site procedures for trip bypass, relay state, and protection coverage before removing it.What sensors does it work with?
It is designed to work with EPRO displacement probes such as 6422, 6423, 6424, and 6425, plus the associated driver/keyphasor modules.Does it support 4-20 mA output?
Yes. It provides buffered/proportional 0/4-20 mA and 0-10 V outputs.Is it still in production?
No. It is considered obsolete. Availability is typically new surplus or removed-from-service stock.What should I send before ordering?
A photo of the nameplate, the existing setpoint sheet, probe type, driver module type, rack slot position, and any observed fault messages. That avoids buying the wrong revision.Can I mix it with non-EPRO probes?
Not without verification. Sensor sensitivity, driver compatibility, and gap voltage must match the module’s design. If the OEM manual does not list the probe, do not assume it will work.
