Product Overview
The Bently Nevada 3500/50-01-00-01 Tachometer Module (Part Number 288062-02) is a 2-channel speed monitoring module for the 3500 Machinery Protection System. It accepts signals from proximity probe transducers (Proximitor® systems) or magnetic pickups to measure rotating shaft speed, rotor acceleration, and reverse rotation. The module compares measured values with user-programmable alarm setpoints and communicates alarm status to the 3500 rack.
Unlike an overspeed protection device, the 3500/50M is intended for continuous speed monitoring and machinery protection and is commonly used in turbine supervisory instrumentation (TSI) systems.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model | 3500/50 Tachometer Module |
| Part Number | 288062-02 |
| Ordering Number | 3500/50-01-00-01 |
| Channels | 2 |
| Inputs | Proximity probes or magnetic pickups |
| Measurements | Shaft speed, rotor acceleration, reverse rotation |
| Power Consumption | Approximately 5.8 W (typical) |
| Transducer Supply | 24 VDC, 40 mA maximum per channel |
| Rack Slot | One full-height front slot |
| Rear Module | One matching I/O module |
| Configuration Software | 3500 Rack Configuration Software |
Typical Applications
The 3500/50-01-00-01 is widely used on:
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Steam turbines
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Gas turbines
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Compressors
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Pumps
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Electric motors
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Generators
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Fans
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Gearboxes
Typical monitoring functions include:
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Shaft rotational speed
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Rotor acceleration
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Reverse rotation
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Zero-speed indication
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Turbine supervisory instrumentation (TSI)
Key Features
Dual-Channel Speed Monitoring
The module accepts two independent transducer inputs for monitoring rotating machinery speed and direction.
Multiple Monitoring Modes
Supported applications include:
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Speed monitoring
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Speed band alarming
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Zero-speed detection
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Rotor acceleration monitoring
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Reverse rotation detection
Integrated Keyphasor® Signal Distribution
The module can distribute conditioned Keyphasor® signals to the 3500 rack backplane, allowing other compatible monitor modules to use the reference signal without requiring a separate Keyphasor module in many applications.
Peak Hold Function
The module records:
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Highest forward speed
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Highest reverse speed
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Reverse rotation events
These values can be reset through the system software.
Programmable Alarm Setpoints
Alarm thresholds are configured using the 3500 Rack Configuration Software, enabling integration with the rack's relay logic and machinery protection functions.
Frequently Asked Questions
1. What does the 3500/50 module measure?
It measures shaft rotational speed, rotor acceleration, and reverse rotation using proximity probes or magnetic pickups.
2. How many input channels are available?
The module provides two independent input channels.
3. Can it replace a Keyphasor® module?
For many applications, it can provide conditioned Keyphasor® signals to other monitor modules through the rack backplane, reducing the need for a separate Keyphasor module.
4. Is this module suitable for overspeed protection?
No. The 3500/50M is not designed as an overspeed protection device; it is intended for monitoring and alarm functions.
5. What transducers are compatible?
The module accepts inputs from:
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Bently Nevada Proximitor® probe systems
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Magnetic pickup sensors
6. What does the "-01-00-01" configuration indicate?
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01 – Internal termination I/O module
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00 – No hazardous-area approvals
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01 – Standard configuration/version
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