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Help CenterBently Nevada 3500/25 Enhanced Key Phase Module
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Bently Nevada 3500/25 enhanced key phase module
Performance characteristics:
Dual-channel design: Each module has 2 input channels and can simultaneously receive 2 signals from eddy current
sensors or electromagnetic sensors. The 3500 mechanical protection system can be equipped with 2 key phase
module modules, receiving up to 4 key phase signals at most, meeting various monitoring requirements.
Precise signal conversion: It can precisely convert the input signal from the eddy current sensor or electromagnetic
sensor into a digital key phase signal, which is used to indicate when the key phase mark on the shaft coincides with
the key phase sensor, providing accurate key phase signals for the monitor module in the 3500 framework to measure
vector parameters such as 1X amplitude and phase.
Strong adaptability of input signals: The input signal range of non-insulated I/O modules is -0.8V to -21.0V, while that
of insulated I/O modules is + 5V to -11V. The module can be limited within the range to prevent the signal from
exceeding this range, which can adapt to the output signals of different types of sensors.
It has the ability to measure rotational speed: The key phase sensor module can record the measured rotational speed
value from each key phase sensor. Rotational speed is used as a basic parameter by the communication gateway
module and the frame interface module. Passive electromagnetic sensors require that the shaft rotational speed be
greater than 200rpm (3.3Hz).
Flexible threshold value setting: The minimum signal amplitude triggered by the automatic threshold value is 2V
peak-to-peak, and the minimum frequency is 120rpm (2Hz). The manual threshold value can be used for any input
greater than 0.017Hz (1rpm for one event per revolution). The input range from 0 to 20Vdc can be selected by the user.
The minimum trigger signal amplitude is 500mV peaking to peak. The lag range from 0.2 to 2.5V can also be selected
by the user. It can be flexibly adjusted according to the actual application scenarios.
The status indication is clear: The front panel is equipped with an OK indicator light, which can indicate whether a fault
has been detected in the key phase module. The TX/RX indicator light can issue an indication when the keyphase
module communicates with the frame interface module (RIM), facilitating users to understand the working status of
the module in real time.
Good compatibility and scalability: It is an improved module of the 3500 system, maintaining full backward
compatibility with existing key phase modules in terms of appearance, assembly and functionality, and can be used in
traditional systems. It also has a stronger key signal processing capability, and can generate event signals once per
revolution from the multi-event input terminal per revolution. It supports on-site upgradable firmware and asset
management data reports and other functions, with good scalability.
Application scenarios:
Steam turbine generator set monitoring: In steam turbine generator sets of thermal power plants and nuclear power
plants, it is used to monitor the key phase signal of the steam turbine rotor, and in combination with the vibration
monitoring module, it can achieve 1X vibration amplitude and phase analysis to determine problems such as rotor
imbalance, misalignment or bearing failure.
Wind turbine generator set status monitoring: Real-time feedback of impeller speed, assisting in the adjustment of the
pitch system, and identifying early faults such as gear wear and bearing defects in the gearbox through key phase
reference.
Large-scale rotating machinery protection: In the catalytic cracking unit, the main fan unit uses the key signal provided
by the 3500/25 module, in combination with the shaft displacement and vibration monitoring module, to build a
complete mechanical protection system, ensuring the safe operation of the equipment under high-load conditions.
Reciprocating compressor fault diagnosis: Although the key phase module is mainly used in rotating equipment, in
reciprocating compressors, the periodic movement of the piston can be analyzed through the crankshaft key phase
signal, and combined with the data from the pressure sensor, the fault of the gas valve or the wear of the piston ring
can be determined.
High-speed motor and machine tool spindle monitoring: For equipment such as CNC machine tool spindles and
high-speed centrifuges, the rotational speed needs to be precisely measured through the key phase module (up to
tens of thousands of revolutions per minute), and a phase reference is provided for dynamic balance correction.
Marine power system monitoring: Shafting monitoring of Marine diesel engines and propulsion motors, obtaining
rotational speed and phase information through key phase modules, analyzing power transmission efficiency in
combination with torque sensors, and simultaneously warning of shafting misalignment or torsional vibration faults.
Aero engine bench testing: During the engine research and development and testing phases, the key phase module is
used to collect the key phase signals of the turbine rotor. In conjunction with dynamic strain gauges, temperature
sensors and other equipment, it analyzes the vibration characteristics and fatigue life of the engine under different
working conditions.
Rotating machinery simulation experiment platform: In the mechanical fault simulation experiments of universities and
research institutions, the 3500/25 module can be used as a standard signal source, providing students and researchers
with precise rotational speed and phase references for verifying fault diagnosis algorithms or the performance of new
sensors.
Urban water supply and sewage treatment pump sets: Speed monitoring and phase analysis of large-scale pump units,
optimizing the operational efficiency of pump sets by combining flow and pressure sensor data, and at the same time
identifying impeller wear or bearing faults through key phase references to reduce the risk of water outage.
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