Emerson A6312 Dual Channel Speed and Keystroke Monitor Specifications

Designed for high reliability on the plant's most critical rotating machinery, the Speed and Critical Monitor monitors speed, phase, zero speed and direction of rotation.

This 1-slot monitor is used in conjunction with the AMS 6500 monitor to form a complete API 670 machinery protection monitor.

Applications include steam, gas, compressor and hydraulic turbine machinery.

The speed and key monitors can be configured in redundant mode for automatic switching from primary to standby speed.

Sensor gap voltages and pulse counting/comparison are monitored to trigger the switchover.

When the speed and key monitor is operated in redundant mode, the primary and failover keys or speed displacement sensors must be mounted in the same axial plane to ensure phase continuity during failover.

Velocity measurements consist of displacement sensors mounted inside the machine targeting rotating gears, keyways, or cogwheels on the shaft.

The purpose of the speed measurement is to sound an alarm at zero speed, monitor reverse rotation, and provide speed measurements to track process conditions for advanced analysis.

Key or phase measurements also consist of displacement sensors, but must have a target of one revolution per revolution, rather than a gear or cog as the target.

Phase measurement is a key parameter for detecting changes in machine health.

The AMS 6500 is an integral part of PlantWeb® and AMS software.

PlantWeb combines the Ovation® and DeltaV™ process control systems to provide operators with an integrated view of machine health.

AMS software provides maintenance personnel with advanced predictive and performance diagnostic tools, enabling them to identify machine failures early with confidence and accuracy.

Dual-channel 3U plug-in modules reduce cabinet space requirements by half compared to traditional four-channel 6U cards

API 670-compliant hot-swappable modules

Remotely selectable limit multiplication and trip bypass

Post-buffered proportional outputs, 0/4-20 mA outputs

Self-test features include monitoring hardware, power inputs, hardware temperature, sensors and cables

Used with displacement sensors 6422. 6423. 6424 and 6425 and drivers

con 011/91. 021/91. 041/91

6TE Wide Module for AMS 6000 19" Rack Mount Chassis

8TE wide module for use with AMS 6500 19" rack mount enclosure

Sensor Inputs

Number of Inputs Two, independent

Input Type Eddy Current, Differential

Emerson Sensor Input Part Numbers: 6422. 6423. 6424. 6425

Isolation Galvanic isolation

Isolated from power supply

Input resistance >100 kΩ

Input Voltage Range 0 to ±27.3 VDC

Input Frequency Range 0 - 20.000 Hz at 65.535 RPM

Measurement Range

Range Continuously adjustable via configuration software

Minimum range 2 V

Maximum range 0 - 30 V

Sensor power supply Individually buffered sensor power supply galvanically isolated from all system voltages and system supply voltages Open and short circuit protected

Nominal voltage -26.75 VDC

Available current 20 mA nominal, 35 mA maximum

Front Panel Outputs

Green LED: Two LEDs indicating channel OK for each channel

Yellow LEDs: Four LEDs indicating alarms and hazards for each channel.

Separate display for each channel

Front panel buffered outputs:

Two, ±10 V, signal input level reduction factor 0.15. >100 kΩ load, frequency range 0 Hz - 16 kHz (-3 dB)

Mini DIN configuration socket:

Module interface connection for configuration, parameter and status monitoring

RS-232

Handle: for easy removal of the card and to provide module and transducer identification boards