3500 System Monitor 3500/45 Input Module
The 3500/45 differential expansion monitor is a four channel monitor that receives input signals from eddy current sensors and uses this signal to drive alarms. Using the 3500 Rack Configuration Software to program 3500/45, it is possible to perform any of the following functions: differential expansion, compensated input differential expansion, and casing expansion (CH3, CH4 only). The 3500/45 monitor uses a displacement input/output module that can receive input signals from the following Bentley sensors.
Eddy current sensors: 25, 35, and 50mm extended range sensors and LVDT.
The basic function of the 3500/45 monitor is to provide 1) mechanical protection, which drives alarms by continuously comparing the rotor displacement with the alarm set point at that time. 2) important rotor displacement information is provided to operators and maintenance personnel. The alarm set points can be set using the 3500 rack configuration software. Alarm setpoints can be set for each valid proportional value, or danger setpoints can be set for each or both valid proportional values based on the monitor type.
When away from the manufacturer, the 3500/45 is delivered in an unconfigured form. When needed, the 3500/45 can be installed into the 3500 rack for configuration to perform the required monitoring functions.
The 3500/45 differential expansion/axial position monitor is a 4-channel monitor that can receive input signals from proximity eddy current sensors, rotary position sensors (RPT), DC linear variable differential converters (DCLVDT), AC linear variable differential converters (AC LVDT), and rotary potentiometers.
3500 rack configuration software, 3500/45 can be programmed to perform the following functions:
Axial (lateral) position;
Differential expansion;
Standard single slope differential expansion;
Non standard single slope differential expansion;
Double slope differential expansion;
Compensatory differential expansion;
Shell swelling;
Valve position
Monitor channels are programmed in pairs, capable of completing up to two functions at a time. Channels 1 and 2 can perform one function, while channels 3 and 4 can perform another (or the same) function. However, only channels 3 and 4 can achieve shell expansion monitoring.
Sensor sensitivity axial position: 3.937 mV/mm (100 mV/mil) or 7.874 mV/mm (200 mV/mil)
Differential expansion: 0.394 V/mm (10 mV/mil) or 0.787 V/mm (20 mV/mil)
Slanted differential expansion: 0.394 V/mm (10 mV/mil) or 0.787 V/mm (20 mV/mil) or 3.937 V/mm (100 mV/mil) or 7.874 V/mm (200 mV/mil)
Compensated input differential expansion: 0.394 V/mm (10 mV/mil) or 0.787 V/mm (20 mV/mil) or 3.937 V/mm (100 mV/mil)
DC LVDT shell expansion: 0.05 V/mm (1.25 V/in) or 0.08 V/mm (1.90 V/in) or 0.10 V/mm (2.50 V/in) or 0.18 V/mm (4.50 V/in) or 0.20 V/mm (5.00 V/in) or 0.22 V/mm (5.70 V/in)
AC LVDT shell expansion: 28.74 mV/V/mm (0.73 mV/V/mil) or 15.35 mV/V/mm (0.39 mV/V/mil) or 9.45 mV/V/mm (0.24 mV/V/mil)
Differential Expansion/Axial Position Monitor 3500/45-AXX-BXX Option Description
A: I/O modules
0 1 position I/O module with internal terminals (eddy current sensor, RPT, DC LVDT)
0 2-position I/O module with external terminals (eddy current sensor, RPT, DC LVDT)
0 3 decentralized TMR position I/O module with external terminals (eddy current sensor or DC LVDT)
0 4 bus connection TMR position I/O module with external terminals (eddy current sensor)
0 5 AC LVDT position I/O module with internal terminals
0
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