Bently Nevada 3500/50M-01-01-01 Tachometer Module Speed Monitoring

Description

Product Introduction

The Bently Nevada 3500/50M-01-01-01 Tachometer Module is a dual-channel speed monitor for rotating machinery. It reads proximity probe or magnetic pickup signals. It captures shaft speed, acceleration, and direction. And it supports alarm setpoints for protection. It fits into the 3500 rack and uses the Rack Configuration Software. It suits turbines, compressors, motors, and high-value assets.

Core Functions

• Speed Monitoring for rotating assets
• Setpoint Alarming with user-defined thresholds
• Speed Band Alarming for dynamic zones
• Zero Speed Notification for shutdown feedback
• Reverse Rotation Notification for protection
• Rotor Acceleration Alarming for safety logic

Technical Data (MECE and Priority Ordered)

• Brand: Bently Nevada
• Model: 3500/50M-01-01-01 Tachometer Module
• Channels: 2 independent input channels
• Signal Type: Proximity probes or magnetic pickups
• Input Range: +10.0 V to -24.0 V
• Input Impedance: 20 kΩ Standard, 40 kΩ TMR, 7.15 kΩ Internal Barrier
• Power Consumption: 5.8 W typical
• Recorder Output: +4 to +20 mA scaling to full range
• Voltage Compliance: 0 to +12 Vdc, max 600 Ω load
• Update Rate: 100 ms typical
• Resolution: 0.3662 µA/bit, ±0.25% room, ±0.7% temp span
• Output Impedance: 550 Ω
• Transducer Supply: 24 Vdc, 40 mA per channel
• Front Indicators: OK / TX-RX / BYPASS status LEDs
• Dimensions: 241.3 x 24.4 x 241.8 mm
• Weight: 0.82 kg
• Rack Slot: Full-height front slot
• Environment: Industrial control-room grade
• EMI/Noise Immunity: Anti-interference design

Installation Guidance

• Install into a 3500 rack front slot
• Wire transducers to I/O module terminals
• Connect buffered outputs for diagnostics
• Commission using 3500 Rack Configuration Software
• Verify alarm setpoints before startup

Commissioning and Maintenance

• Direct recorder output review without service removal
• Front coaxial jacks allow online signal tests
• Fast module swap without rewiring
• Stable alarm logic simplifies diagnostics

Compatibility

• 3500 Machinery Protection System
• Proximity probe systems (Bently Nevada standard)
• Magnetic pickup speed sensors (within limits)

Certifications

• Industrial compliance for rotating machinery platforms
• Application standard per 3500 system rules

Packaging & Shipping

• 1× 3500/50M Tachometer Module
• 1× I/O terminal set
• 12-month warranty
• Ships by FedEx, UPS, DHL

Typical Applications

• Steam turbines and gas turbines
• Centrifugal compressors
• Pumps and critical electric motors
• Generators and industrial fans
• Condition monitoring and shutdown logic

Diagnostic Capability

• Detects overspeed and low-speed events
• Identifies reverse rotation events early
• Supports trend tracking via buffered output

FAQ

Q: What sensor type works best for critical speed protection?

A: Proximity probes provide the most stable measurement in high-value assets.
Q: Can I read live diagnostic signals without shutdown?

A: Yes, use the coaxial buffered jacks for real-time testing.
Q: Does the module force rack communication settings?

A: It follows the existing rack bus rules defined in configuration.
Q: What is the best practice before enabling alarms?

A: Confirm setpoint values and validate shutdown logic during a dry-run test.
Q: Can recorder output feed a PLC or DCS loop?

A: Yes, 4-20 mA output supports standard analog input cards.

Warranty & Contact

• 12-month limited warranty
• Technical support available on request
• Phone Support: +86 158 8020 0923

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Contact: +86 158 8020 0923