The Emerson A6312 (9199-00024) Speed/Key Module (8HP) is a dual-channel monitoring device designed for critical speed and phase reference (keyphasor) measurements in rotating machinery protection systems.
1. Key Functions
Speed Monitoring:
Tracks rotational speed (RPM) using eddy current or Hall-effect sensors (e.g., PR6423/PR9376), with configurable thresholds for overspeed/underspeed protection.
Keyphasor Detection:
Provides 24V TTL pulse outputs for phase reference (shaft position), essential for vibration analysis and synchronization.
Redundancy Support:
Allows automatic switchover between primary/backup sensors to ensure continuous operation.
Integration:
Compatible with Emerson Bently Nevada 3500/System 1™ and AMS 6500 platforms for predictive maintenance.
2. Technical Specifications
Inputs: 2 independent channels (supports 0 to -27.3V DC sensor signals).
Outputs:
TTL pulses (0-5V) for speed signals.
4-20mA/relay contacts for alarms/trips (API 670 compliant).
Power Supply: -26.75V DC for sensor excitation.
Certifications: Meets SIL 2/3 for safety-critical applications.
3. Applications
Turbomachinery: Steam/gas turbines, compressors (API 612/670 standards).
Industrial Rotating Equipment: Pumps, fans, and motors requiring speed/phase monitoring.
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