Description

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The EPRO PR6423/002-040 is an industrial-grade dual-channel bearing vibration monitoring module developed by Emerson Process Management (formerly EPRO Germany). It is specifically designed for condition monitoring and protection systems of rotating machinery (such as steam turbines, compressors, fans, gearboxes, etc.). As a core component of the MMS 6000 series, it uses an electric speed sensor to collect bearing vibration signals in real time, achieving high-precision, high-reliability vibration parameter analysis and alarm triggering. It is widely used in key industrial fields such as power, petrochemical, and metallurgy.

　　Core Functions and Working Principle

Dual-channel independent measurement: The module contains two completely independent measurement channels, allowing simultaneous real-time monitoring of two monitoring points.

Sensor Compatibility: Primarily used with motorized speed sensors (such as the PR9268 series) to measure the absolute vibration velocity or displacement of bearing housings.

Operating Status Monitoring: Real-time comparison with set alarm limits; if vibration exceeds the limit, an alarm or shutdown protection signal will be triggered to prevent major mechanical accidents.

Module Key Features:

Hot-Swap Support: Can be swapped out while the system is running without affecting the normal operation of other monitoring modules.

Configurable Software: Measurement range, alarm delay, channel parameters, etc., can all be flexibly adjusted through dedicated configuration software.

High Reliability Design: Built-in self-test system automatically identifies sensor disconnections, short circuits, or internal channel faults within the module.

　　Main Technical Parameters

　　Parameter Specifications

Sensor Input: 2 independent motorized velocity sensors (PR9266/…, PR9268/…), electrically isolated

Input Impedance: >100 kΩ

Input Voltage Range: -5 ~ +15 V DC (±10V permissible)

Measurement Range (Vibration Velocity VRMS): 5 ~ 100 mm/s (corresponding displacement ±25 ~ ±500 μm)

Frequency Range: 10 ~ 1000 Hz (refer to VDI2056/DIN45666/ISO3945); selectable 5/10 ~ 50 ~ 1000/1600 Hz

Boost Coil Current: 0 ~ 8 mA (configurable, 40 μA steps), accuracy ±0.5% FS / ±0.5% setpoint

Key Phase Pulse Input: 24V Logic, ≥13V, 1 pulse per revolution, used for speed control and spectrum analysis

Control Input (ES disabled): Shared by 2 channels, 24V logic

　　Signal Output

Output Type, Channel Specification, Remarks

Current Output (characteristic value): Ch1: I1+/I1- (z18/b18); Ch2: I2+/I2- (z20/b20) 0/4~20 mA, configurable load <500Ω, accuracy ±1% FS

Voltage Output (characteristic value): Ch1: EO1 (d14); Ch2: EO2 (d16) 0 ~ 10 V DC, load >10 kΩ

Dynamic Signal Output (for spectrum analysis): Ch1: AC1 (z14); Ch2: AC2 (z16) 0 ~ 20 Vpp, frequency range 0.1 ~ 5 kHz (±20%/3dB), load >10 kΩ kΩ

Alarm Output: Dangerous D1-C/D1-E, A1-C/A1-E; D2-C/D2-E, A2-C/A2-E Normally Open/Normally Closed Selectable (SC-A/SC-D Control) Alarm Retention Type, Requires Software Reset

Channel Normal Output: C1-C/C1-E, C2-C/C2-E Normally Closed Contact

　　Alarm and Protection Functions

　　Function Description

Alarm Value/Danger Value: Independently set for each channel, rising edge triggered

Alarm Hysteresis: Full scale 1% ~ 10% Selectable, falling edge triggered, prevents repeated jumps near the limit

Limit Multiplier: Multiplication factor X = 1.00 ~ 5.00, used to avoid false alarms when exceeding critical speed (requires d18 = low level)

Alarm Retention: Alarm state is retained, requires software to send a Reset latch to channel 1/2 Command Reset

Channel Fault Detection: Automatic detection and indication of sensor short circuit/open circuit, input over-limit, overload, etc.

Self-Test and Diagnostic Functions

Extended Self-Test: Built-in sensor self-test function

　　Password Protection (Operator Level)

RS-232/RS-485 Communication Port: Supports on-site configuration, parameter setting, measurement value reading, and spectrum analysis

Stores the most recent start/stop process data, which can be displayed on a computer

Redundant Power Input: Supports hot-swappable replacement during operation

　　Built-in Linearization Processor

Can be combined with other MMS6000 series modules (such as Eccentric MMS6220, Displacement MMS6210, Overspeed MMS6312, Differential Expansion MMS6410, etc.) to form a complete turbomachinery protection system, and can be connected to DCS, analysis and diagnostic systems, WAN/LAN/Ethernet, etc.

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