1440-VST02-01RA | Allen-Bradley XM-120 Dynamic Measurement Module

The Allen-Bradley 1440-VST02-01RA XM-120 Dynamic Measurement Module belongs to the XM Series, which provides advanced condition monitoring and protection for rotating and reciprocating machinery. This module focuses on measuring eccentricity in rotors, an essential factor for maintaining machinery health and preventing potential issues during operation.

Key Features:

• Type: XM-120 Standard Dynamic
• Part Number: 1440-VST02-01RA
• Brand: Allen-Bradley / Rockwell Automation
• Sub Brand: XM Series

Functionality:

The XM-120 Eccentricity module monitors the eccentricity of rotors, which refers to the amount of bow or distortion. Typically, rotor bow can arise due to mechanical stress, uneven thermal heating, or the weight of the rotor. The module provides key measurements such as:

• Peak-to-peak eccentricity
• Maximum instantaneous DC voltage (max gap)
• Minimum instantaneous DC voltage (min gap)
• Instantaneous DC voltage (gap)

Thanks to these measurements, the module can accurately assess rotor conditions, making it suitable for almost any type of rotating or reciprocating machinery. You can use the module to monitor rotor bow either before startup or during operation.

Eccentricity Monitoring:

The XM-120 accepts input from non-contact eddy current probe systems, which accurately measure rotor eccentricity. Moreover, the module can also take inputs from a tachometer, enabling speed measurements. This feature becomes particularly useful as it can disable eccentricity alarms after the machine starts, ensuring smooth operation.

Relay and Networking:

The XM-120 includes one on-board relay, and it is expandable up to five relays. This provides flexibility in setting up the system to monitor multiple parameters simultaneously. Additionally, the module can operate as a stand-alone device or connect to a DeviceNet network, which allows it to provide real-time data and status updates to other devices such as other XM modules, PLCs, DCS systems, or Condition Monitoring Systems.

Furthermore, users can configure the module remotely through the DeviceNet network or locally by using a serial connection to a PC or laptop.

Technical Specifications:

• Voltage Rating: 24 VDC
• Amperage Rating: 300 mA
• Wattage: 7 W
• Temperature Rating: -20°C to 65°C (-4°F to 149°F)
• Series: XM
• Item Type: Measurement Module
• UPC: 10611320983279

Application:

The 1440-VST02-01RA XM-120 module is indispensable in applications that require precise monitoring of rotor eccentricity, particularly during machine startup. This module is ideal for industries like power generation, manufacturing, and any field where rotating machinery is integral. By monitoring eccentricity, it helps prevent mechanical failure, reduces downtime, and improves machine reliability.

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