Bently 1701-15 Input Monitor

Product Detailed Description

• Function:

• Shaft Relative Radial Vibration (Direct/Overall Vibration): Measures the dynamic movement of a shaft relative to its bearing housing.

• Shaft Radial Position (Gap Voltage): Measures the average position of the shaft within its bearing clearance.

• Shaft Axial Position (Thrust Position): Measures the axial displacement of the rotor, critical for thrust bearing health.

• Receives raw voltage signals from up to two Bently Nevada proximity probes.

• Conditions these signals to provide accurate measurements of:

• Compares these measurements to user-programmable alarm setpoints (Alert and Danger levels).

• Generates alarms when measurements exceed or fall below set thresholds.

• Provides a "NOT OK" condition annunciation for issues with the monitor itself or connected transducers.

• Can transmit current values of measured parameters to a host control system (e.g., DCS, PLC) for indication and trending, often via network adapters like those used with Allen-Bradley Flex I/O.

• Includes embedded self-tests to assess its own integrity and that of its connected transducers.

• Key Features:

• 2-Channel Monitoring: Capable of monitoring two independent points simultaneously.

• Proximity Probe Compatibility: Designed to work seamlessly with Bently Nevada proximity probes and extension cables.

• Radial Vibration & Thrust Position: Specialized for these critical machine health parameters.

• Programmable Alarms: User-configurable Alert and Danger setpoints with adjustable time delays (0.15 to 20 seconds).

• Latching/Non-Latching Alarms: Flexibility in alarm behavior.

• Buffered Output: Provides a buffered output proportional to the processed signal for local analysis or connection to other systems (though not isolated).

• Field-Mounted Design: Allows installation closer to the machinery, reducing wiring costs.

• Embedded Self-Tests: Enhances reliability by continuously checking its own health and connected transducers.

• Integration Capability: Designed for compatibility with distributed process automation and control systems, particularly those using Allen-Bradley's Flex I/O architecture.

Product Parameters

(Note: These are typical parameters for the 1701/15. Always refer to the official Bently Nevada documentation for the specific part number or configuration you have, as minor variations may exist.)

• Channels: 2

• Input: Accepts signals from Bently Nevada proximity probes (e.g., 3300 XL, 7200 Series).

• Measurements: Radial Vibration (Direct/Overall, Gap), Axial Position (Thrust Position).

• Full-Scale Direct (Vibration) Ranges (Programmable):

• Mils pp: 0-3, 0-5, 0-10, 0-15, 0-20, etc. (up to 0-75 mils pp)

• Micrometers pp: 0-100, 0-125, 0-150, 0-200, 0-250, 0-300, 0-400, 0-500 µm pp.

• Full-Scale Gap Range: 24 Volts (typical for Bently Nevada systems, -1V to -23V proportional range).

• Accuracy:

• Direct (Vibration): 1% of full-scale maximum (exclusive of filters).

• Gap: ± 20mV (-1 to -23 V range).

• Resolution:

• Direct: 0.1% of full-scale.

• Gap: 1 mV.

• Alarms:

• Two programmable alarm setpoints per channel (Alert and Danger).

• Setpoint Resolution: 0.5% of full-scale.

• Alarm Time Delays: Selectable from 0.15 to 20 seconds.

• Alarm Latching/Non-Latching options.

• Buffered Output: 30 m (100 ft) cable drive capability at 60 pF/ft. (Not isolated, output impedance 200 Ω).

• Power Input: -24 V, +5 V (from 1701 Power Supply).

• Power Consumption: 1.5 Watt (excluding transducers).

• Operating Temperature: -20°C to +70°C (-4°F to +158°F).

• Storage Temperature: -40°C to +85°C (-40°F to +185°F).

• Operating/Storage Humidity: 5% to 95% non-condensing relative humidity.

• Physical Dimensions (H x W x D): Approx. 127 mm x 21.6 mm x 105 mm (5 in x 0.85 in x 4.15 in).

• Weight: Approx. 314 g (0.69 lb).

• Hazardous Area Approvals: Often Ex nA IIC T4, Class I, Div 2, Groups A, B, C, D (check specific model/certification).

Product Advantages

• Critical Machine Protection: Provides essential monitoring for radial vibration and thrust position, which are fundamental indicators of rotating machinery health, preventing catastrophic failures.

• Reduced Installation Costs: Its field-mounted, distributed I/O architecture minimizes the need for extensive long cable runs back to a central monitoring system, reducing material and labor costs.

• Integration with Control Systems: Designed to integrate with popular distributed control systems (DCS) or PLCs, especially those utilizing Allen-Bradley's Flex I/O, allowing for centralized control and data acquisition.

• Early Fault Detection: Continuous monitoring and precise alarming capabilities enable early detection of developing machinery problems, facilitating proactive maintenance.

• Diagnostic Information: Provides both vibration and gap values, along with self-test diagnostics, offering valuable insights into machine health for troubleshooting.

• Reliability: Bently Nevada products are known for their robust design and reliability in harsh industrial environments.

• Flexibility: Programmable ranges and alarm settings allow customization for various machine types and operating conditions.

Precautions

• Obsolete Status: The 1701 series is considered legacy or discontinued by Bently Nevada/GE. While still operational in many plants, support, spare parts availability, and compatibility with modern systems may be limited.

• Proper Transducer Selection & Installation: Ensure that the correct Bently Nevada proximity probes and extension cables are used and installed precisely according to Bently Nevada's specifications (e.g., gap setting, target material, mounting). Incorrect installation is a common source of measurement errors.

• Clean Power Supply: The module requires a stable and clean -24V and +5V DC power supply from the 1701 Power Supply module. Power quality is crucial for accurate measurements.

• Environmental Limits: Adhere strictly to the specified operating temperature, humidity, and vibration limits to ensure accurate and reliable operation.

• Hazardous Area Compliance: If used in hazardous locations, ensure the specific module has the necessary certifications (e.g., ATEX, FM) and that installation strictly follows hazardous area classification requirements and local codes.

• Calibration: While factory calibrated, periodic field verification or calibration may be necessary to maintain measurement accuracy.

• System Integration: Understand the communication interface (often via a Flex I/O adapter) and ensure proper configuration of the host control system to interpret the module's data and alarms.

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