Emerson EPRO A6740-12-N 16-Channel Output Relay Module
A 12 TE output-relay module for machinery-protection shutdown and annunciation logic.
Technical Summary
A6740-12-N is an Emerson EPRO 16-channel Output Relay Module in the A6740 family. The 12 TE-wide relay card is used with IMR 6000/10, IMR 6000/20 and IMR 6000/30 racks in AMS 6500 machinery-protection architectures.
The module receives protection states from the rack and applies configurable logic to sixteen relay outputs. The complete A6740-12-N identity should remain attached to the installed rack arrangement and project trip philosophy.
Specifications
| Manufacturer | Emerson EPRO |
|---|---|
| Model | A6740-12-N |
| Product Family | AMS 6500 machinery protection |
| Product Type | 16-channel Output Relay Module |
| Rack Compatibility | IMR 6000/10, IMR 6000/20 and IMR 6000/30 |
| Module Width | 12 TE |
| Mechanical Format | 3U, 100 × 160 mm Eurocard |
| Relay Outputs | 16 |
| Control Voltage | 13 to 32 VDC |
| Contact Load | 48 V, 1 A |
| Contact Mode | SPDT; normally open or normally closed selectable |
| Energization | Normally energized or normally non-energized selectable |
| Logic Capacity | Up to 30 logic expressions |
| Logic Functions | Off, AND, OR, 2oo3 and AND-AND-OR |
| Output Delay | 0 to 30 seconds |
Features
- Provides sixteen independently assigned relay outputs for protection and annunciation duties.
- Accepts channel Clear, Alert and Danger states as configurable logic inputs.
- Supports normally energized and normally non-energized trip philosophies.
- Allows relay delays and voting logic to be configured for the approved machine-protection design.
- Uses redundant mechanical relays in the documented output architecture.
Compatibility
- Confirm the installed IMR 6000 rack type, slot position and backplane arrangement.
- Preserve the exact A6740-12-N suffix and compare the card label with the removed module.
- Review every relay assignment, contact state, energization state, delay and logic expression before exchange.
- Do not substitute the 10 TE A6740-10 version without confirming rack mechanics and the approved protection design.
Replacement
- Export or document relay logic, delays, contact modes and channel assignments before removal.
- Place the machinery protection system in the approved bypass or outage state and isolate field trip circuits.
- Verify terminal identification and continuity before installing A6740-12-N.
- Proof-test each relay path, alarm route and shutdown action before restoring automatic protection.
FAQ
A6740-12-N: Which project records should accompany a quotation?
Provide the rack model, slot number, front and rear labels, relay schedule, logic printout and photographs of the installed card.
Can A6740-10 replace A6740-12-N?
Not as a visual or part-family substitution; the module width and rack application differ and must be reviewed against the installed chassis.
A6740-12-N: What must be preserved before replacing the relay module?
Retain the complete logic assignment, output delay, contact mode, energization state and field trip-circuit schedule.
A6740-12-N: How should repaired hardware be accepted?
Request channel-by-channel relay operation, contact-load test evidence, isolation checks and traceability to the exact hardware revision.
A6740-12-N: What is the safest commissioning approach?
Use a documented proof test that verifies every alarm and shutdown path without exposing the machine to an unintended trip or an unprotected condition.
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