3500/50M-01-01 Bently Nevada Tachometer Module - 3500 Series

System Overview: Bently Nevada 3500/50M-01-01

The Bently Nevada 3500/50M-01-01 serves as a high-precision Tachometer Module within the 3500 Monitoring System. Engineered for mission-critical rotating equipment, it processes dual transducer inputs to deliver accurate rotor speed and acceleration data. This module integrates seamlessly into the 3500 rack, offering reliable performance for complex industrial speed-sensing applications.

Configuration & Ordering Breakdown

The 3500/50M-01-01 follows a modular ordering structure:

• 3500/50M: Tachometer Module Base Unit
  • I/O Type (01): Internal terminations for I/O module.
  • Agency Approval (01): cNRTLus (Class 1, Division 2 compliant).

Key Technical Specifications

• Input Channels: 2 Independent Transducer Inputs.
• Input Range: +10.0 V to -24.0 V.
• RPM Accuracy: ±1 rpm (100 to 10,000 rpm).
• Frequency Range: Max 20 kHz input frequency.
• Transducer Supply: 24 Vdc, 40 mA maximum per channel.
• Power Consumption: 5.8 Watts (typical).

Diagnostic & Operational Capability

The 3500/50M-01-01 provides real-time health monitoring through front-panel LED indicators: OK LED for operational integrity, TX/RX LED for rack-bus communication, and Bypass LED for maintenance mode. It supports complex logic, including rotor acceleration and zero-speed detection, with advanced filtering to ignore noise in passive magnetic pickups.

Global PLC Spare HUB's Insight

We recommend the 3500/50M for applications involving high-speed turbines and large compressors where precise shaft speed is essential for safety interlocking. Its high input impedance (20 kΩ) ensures signal purity, even when sharing proximity probe outputs with other monitoring instrumentation.

Logistics & Quality Guarantee

• Shipping: Expedited worldwide delivery via FedEx, UPS, and DHL.
• Dispatch: Ready for shipping within 24–48 hours of order confirmation.
• Guarantee: Each unit includes a standard 12-month quality assurance policy.

Professional Frequently Asked Questions

What firmware/software compatibility must I verify before installation?
Ensure your rack utilizes 3500/22M firmware revision 1.70 or later, and that your Configuration Software is updated to version 4.20 or newer to support the 3500/50M module functions.

Can I use this module with both proximity probes and magnetic pickups?
Yes, the module is compatible with both. However, note that passive magnetic pickups require a minimum input frequency of 3.3 Hz for accurate signal detection.

How does the I/O module selection (01) impact my field wiring?
Choosing option 01 provides internal terminations, simplifying the installation process by allowing direct field wire connections to the rear I/O card, reducing the need for external terminal blocks.

Selection Guide: What should I consider for "Zero Speed" applications?
When configuring for zero-speed detection, verify that your target provides a consistent event-per-revolution ratio between 1 and 255. Ensure the proximity probe is properly gapped for the target material.

Why is my module displaying a communication fault (TX/RX LED blinking)?
This typically indicates a rack communication issue. First, verify the module is firmly seated in the backplane. Then, confirm your 3500/22M interface module is correctly communicating with the rack-wide data bus.

Tags