Description
⚙️ Product Introduction
The BENTLY NEVADA 3500/50, part number 133388-02, is a two-channel Tachometer Module for the 3500 Machinery Protection System. It accepts signals from compatible proximity probes or magnetic pickups to monitor shaft rotational speed, rotor acceleration, and rotor direction.
The module compares measured values against user-programmable alarm setpoints and generates alarms when configured limits are exceeded. It can also provide conditioned Keyphasor signals to the 3500 rack backplane for use by other monitoring modules.
🔧 Monitoring Function
The 3500/50 is designed for machinery condition monitoring rather than direct speed control. Its two input channels can be used for speed-related measurements and configured for functions such as speed-band alarming, zero-speed notification, rotor acceleration alarming, or reverse-rotation notification.
The module also provides peak-hold information, allowing the highest measured speed, highest reverse speed, or number of reverse rotations to be retained and reset by the user.
🏭 Typical Applications
• Steam and gas turbine monitoring
• Compressor machinery
• Pumps and rotating equipment
• Generator systems
• Industrial machinery protection
• Power plant condition monitoring
• Bently Nevada 3500 monitoring racks
• Machinery diagnostic systems
📋 Product Datasheet
| Parameter | Specification |
|---|---|
| Manufacturer | BENTLY NEVADA |
| Model | 3500/50 |
| Part Number | 133388-02 |
| Product Type | Tachometer Module |
| Number of Channels | 2 |
| Input Type | Proximity Probe / Magnetic Pickup |
| Measurement Functions | Shaft Speed, Rotor Acceleration, Rotor Direction |
| Alarm Function | User-Programmable Setpoint Alarms |
| Keyphasor Output | Conditioned Signal to 3500 Rack Backplane |
| Input Impedance | 20 kΩ standard |
| Transducer Power Supply | -24 VDC, 40 mA maximum/channel |
| Output Impedance | 550 Ω |
| Rack Space | 1 Full-Height Front Slot |
| Dimensions | 241.3 × 24.4 × 241.8 mm |
| Weight | 0.82 kg (1.8 lb) |
| Operating Temperature | -30°C to +65°C* |
| Storage Temperature | -40°C to +85°C |
| Humidity | Up to 95%, non-condensing |
| Installation | Bently Nevada 3500 Rack |
| Country of Origin | USA* |
*Operating temperature depends on the installed I/O termination configuration.
⚡ Key Features
• 2-channel tachometer monitoring
• Shaft speed measurement
• Rotor acceleration monitoring
• Reverse rotation detection capability
• Programmable alarm setpoints
• Peak-hold functionality
• Conditioned Keyphasor signal output
• Designed for Bently Nevada 3500 rack installation
🔌 System Integration
The 3500/50 is installed in a Bently Nevada 3500 rack and works with compatible I/O modules and rack infrastructure. Configuration is performed through the 3500 Rack Configuration Software.
The conditioned Keyphasor output can provide a processed speed/phase reference to other modules through the rack backplane, reducing the need for a separate Keyphasor module in configurations that support this function.
🛠️ Installation Notes
Before installation, verify the complete identification 3500/50 / 133388-02, I/O termination type, transducer compatibility, rack configuration, and software setup.
Check probe wiring, signal polarity, power supply, and terminal connections before energizing the system. After installation, verify channel status, measured speed, alarm settings, and rack diagnostics.
⚙️ Commissioning Checklist
• Verify module part number
• Confirm 3500 rack compatibility
• Check transducer type
• Verify field wiring
• Confirm -24 VDC transducer supply
• Configure speed parameters
• Set alarm thresholds
• Test tachometer inputs
• Verify Keyphasor output
• Check rack diagnostics
⚠️ Compatibility Notice
The BENTLY NEVADA 3500/50 133388-02 is a tachometer monitoring module, not an overspeed trip controller. Published documentation notes that it is intended for monitoring and annunciation rather than primary overspeed protection or closed-loop speed control.
For replacement applications, confirm the exact part number, I/O termination configuration, transducer type, rack revision, and existing 3500 system configuration before installation.
📦 Product Identification
Brand: BENTLY NEVADA
Model: 3500/50
Part Number: 133388-02
Product Type: Tachometer Module
Channels: 2
Function: Speed / Acceleration / Direction Monitoring
Application: Machinery Protection & Condition Monitoring
System: Bently Nevada 3500 Series
