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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | A6500-RC |
| Function | System relay / alarm output logic |
| Relay Outputs | 16 × SPDT |
| Logic Inputs | 66 (channel clear / alert / danger, etc.) |
| Logic Networks | Up to 16 |
| Relay Contact Rating | 32 VDC / 48 VAC, up to 2 A (depending on load type) |
| Form Factor | 3U, 2-slot (10 TE wide) plug-in module |
| System Compatibility | AMS 6500 ATG / A6500-SR rack |
| Standards | API 670 compliant, hot-swappable |
| Special Features | Boolean logic, time delays, graphical configuration |
4. Product Introduction
The Emerson A6500-RC is the 16-channel System Relay Card for the AMS 6500 ATG machinery protection system. It accepts alarm, alert, and clear signals from measurement modules in the rack, applies user-configured Boolean logic and time delays, and drives 16 SPDT relay outputs for machine trips, alarms, or interlocks.
The module occupies two slots and is designed for high-reliability protection of critical rotating equipment such as steam turbines, gas turbines, compressors, and hydro machines. Configuration is performed with graphical drag-and-drop logic software. Confirm rack type (A6500-SR) and overall system architecture before installation.
A6500-RC
A6500-RC
A6500-RC
A6500-RC
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Relays not energizing | Configuration or power issue | ✅ High | Verify logic configuration and module power | Check logic networks and power supply |
| Unexpected relay trips | Incorrect logic or input mapping | ✅ High | Review graphical logic and input assignments | Correct logic equations and time delays |
| One or more relays fail | Contact wear or output fault | ✅ High | Test individual relay outputs | Replace module if contacts are damaged |
| Logic inputs not recognized | Wiring or signal level problem | ✅ Medium | Measure input voltage levels (active 13–32 V) | Check field wiring and signal sources |
| Module not recognized by system | Slot or backplane issue | ❌ Medium | Reseat module; check adjacent cards | Confirm proper seating and system power cycle |
| Configuration will not load | Software or card error | ✅ Medium | Re-send configuration; check for card events | Replace card if EEPROM or flash errors persist |
If problems continue, record exact system events, logic configuration screenshots, and relay wiring details.
6. Frequently Asked Questions (FAQ)
Q: What does the A6500-RC do?
A: It is the system relay card that takes alarm/alert signals from the measurement modules, applies Boolean logic and time delays, and drives 16 SPDT relay outputs for trips and interlocks.
Q: How many relays and logic inputs does it have?
A: 16 SPDT relay outputs and 66 logic inputs. Up to 16 independent logic networks can be defined.
Q: Is it hot-swappable?
A: Yes, it is designed as an API 670 compliant hot-swappable module. Follow Emerson AMS 6500 ATG procedures for safe replacement.
Q: What rack does it fit?
A: It is a 10 TE wide module intended for the A6500-SR system rack used with the AMS 6500 ATG.
Q: Can I configure complex voting logic?
A: Yes. The graphical logic engine supports AND, OR, XOR, SR, RS, MooN, and other functions with time delays.
Q: What should I check before ordering a replacement?
A: Confirm the exact part number, rack type, current logic configuration, and any system event logs. Photograph the front panel and labels.
Q: Is the A6500-RC still in production?
A: Availability of new modules varies. Many units on the market are new surplus or carefully tested. Confirm current stock and revision when ordering.
