summary
Bently Nevada 3500/45-01-00 position monitor is a four-channel module, which is specially designed for displacement measurement and protection of rotating machinery. The module can receive signals from an eddy current sensor, rotary position sensor (RPT), DC/AC linear variable differential transformer (LVDT), and rotary potentiometer, and compare the input with a user-programmable alarm value after conditioning, thus driving mechanical protection action and providing key operation information.
The "01" in the model represents the use of an internal terminal position I/O module (135137-01), which is suitable for eddy current sensor, RPT, or DC LVDT configuration and simplifies field wiring.
Describe
The core function of the 3500/45 position monitor is to protect the machine by continuously comparing monitoring parameters with preset alarm values, and at the same time provide necessary mechanical information for operators and maintenance personnel. The monitoring channel is programmed in pairs, which can perform at most two functions at the same time. For example, channels 1 and 2 may perform a measurement function, while channels 3 and 4 perform the same or different functions.
The module is programmed by 3500 rack configuration software, and each channel can be configured to perform any of the following functions:
Axial (thrust) position: Monitor the axial position of the rotor relative to the thrust bearing.
Differential expansion: Measure the difference in thermal expansion between rotor and cylinder.
Differential expansion of standard single slope/differential expansion of nonstandard single slope/differential expansion of double slope
Compensated differential expansion: double sensor compensation input mode is adopted.
Shell expansion: only for channels 3 and 4.
Valve position: Monitor the opening of the steam turbine control valve.
3500/45-01-00
3500/45-02-00
3500/45-03-00
3500/45-04-00
3500/45-05-00
3500/45-06-00
3500/45-07-00
3500/45-08-00
3500/45-01-01
3500/45-02-01
3500/45-03-01
3500/45-04-01
3500/45-05-01
3500/45-06-01
3500/45-07-01
3500/45-08-01
132242-01
132234-01
125808-06
128015-06
125808-07
128015-07
141208-01
Main features and advantages
Multi-sensor compatibility: Supports eddy current sensors (including 25mm, 35mm, and 50mm extended range probes), RPT, DC/AC LVDT, and rotary potentiometer to meet different measurement requirements.
Paired channel programming: 1/2 and 3/4 channels can be configured with different functions respectively, realizing flexible measurement combination and maximizing module utilization.
Double protection function: it not only provides mechanical protection (tripping logic is driven by alarm setting), but also provides real-time machine state information required by operators.
Internal terminal I/O: The 01 option is equipped with an internal terminal I/O module (135137-01), which eliminates the need for an external terminal block and reduces the wiring complexity in the cabinet.
Front panel LED indicator: equipped with OK, TX/RX, and Bypass LED indicators, which is convenient for quickly judging the running status of the module.
technical specifications
Parameter specification
Model 3500/45-01-00 Position Monitor
Number of channels: 4 channels
Input signal type: eddy current sensor, RPT, DC LVDT, AC LVDT, rotary potentiometer.
I/O module type 01: internal terminal position I/O (eddy current, RPT, DC LVDT)
Input impedances are 10 kω (Proximitor/RPT), 1 MΩ(DC LVDT), 137 kΩ(AC LVDT), and 200 kΩ (potentiometer).
7.7 W typical power consumption (position I/O)
The axial position sensitivity is 3.94mv/μ m (100mv/mil) or 7.87 mV/μm (200 mV/mil).
The differential expansion sensitivity is 0.394 v/mm (10 mv/mil) or 0.787 V/mm (20 mV/mil).
Operating temperature: -40 °C to +85 °C.
Channel Programming Pairwise Programming (1/2 and 3/4)
The alarm set point Alert can configure each valid measurement value; Danger can configure any two valid values.
Model configuration
The complete coding of 3500/45-01-00 is as follows:
3500/45: Basic model of position monitor
01: I/O module type-internal terminal position I/O (for eddy current sensor, RPT, DC LVDT)
00: No institutional certification
Other I/O options include: 02 (external terminal), 03/04(TMR position I/O), 05/06(AC LVDT), 07/08 (rotary potentiometer).
application area
3500/45-01-00 is widely used in rotating machinery requiring accurate displacement monitoring;
Turbo-generator set: Monitor the absolute expansion and axial displacement of the cylinder to protect the safe operation of the unit.
Steam Turbine and Gas Turbine: Differential Expansion Monitoring and Thrust Position Protection
Centrifugal and axial compressors: monitoring of axial displacement and differential expansion
Pump system: position monitoring of thrust bearing
Paper mill and mining equipment: displacement protection of key rotating machinery
Key points of installation and configuration
Compatibility of sensors: When using eddy current sensors, it is necessary to confirm that the sensor range (25/35/50mm extension range) matches the measurement requirements.
Pairwise programming rules: The shell expansion function is limited to channels 3 and 4; Each pair of channels performs at most two functions.
Alarm configuration: use 3500 rack configuration software to set Alert and Danger set points, and the Danger value is limited to any two valid measured values.
Firmware requirements: When adding to the existing 3500 system, 3500 configuration software version 2.41 or higher is required; RPT valve position function requires version 3.00 or higher.
