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Product Description
The Bently Nevada 3500/50M-01-00 (Functional Part Number 286566-02) is a high-precision 2-channel Tachometer Module engineered for comprehensive speed monitoring within the 3500 Series chassis. It conditions pulse signals from proximity probes or magnetic pickups to track true rotational shaft speed, rotor acceleration, and zero-speed indicators. This 3500/50M device provides robust overspeed detection and critical trip parameters to protect high-speed machine trains from severe inertial mechanical destruction.
Configuration & Option Tree Breakdown
3500/50M - Tachometer Module Assembly (Ref: 286566-02)
|
├── [01] I/O Module Hardware Option
│ └── Internal Terminations Enabled
│ └── Dual Transducer Input Channels
│
└── [00] Regulatory Agency Approvals
└── None (Standard Non-Hazardous Environmental Mounting)
Technical Specifications
| Engineering Parameter | Factory Data Limits |
|---|---|
| Brand & Origin | Bently Nevada (Made in U.S.A) |
| Model & Part Identification | 3500/50M-01-00 / 286566-02 |
| Input Range Limits | +10.0 Vdc to -24.0 Vdc internal clipping threshold |
| Standard Input Impedance | 20 kΩ instrumentation resistance configuration |
| Maximum Frequency Threshold | 20 kHz upper limit bandwidth capacity |
| RPM Measurement Accuracy | Under 100 RPM: ±0.1 RPM | Max Range: ±0.01% of true shaft speed |
| Current Loop Output Resolution | 0.3662 µA per bit conversion accuracy |
| Transducer Power Feed | 24 Vdc constant supply, 40 mA peak per channel limit |
| Hardware Current Loop | +4 to +20 mA linear proportional output, 600 Ω max compliance |
Oiltech Controls Limited’s Insight
From our technical evaluation, the 3500/50M-01-00 represents a critical upgrade over older legacy speed cards because it provides dynamic threshold tracking. Instrument technicians often run into pulse-skipping or false noise triggering when setting up magnetic speed loops on old infrastructure. The Auto Threshold tracking algorithm on this card eliminates manual calibration by adapting dynamically to any pulse signal above 0.0167 Hz. Be aware that the 286566-02 assembly requires a 3500/22M Transient Data Interface firmware revision 1.70 or higher; it will not communicate with legacy 3500/20 standard interfaces.
Target Machinery, Applications & Diagnostic Capabilities
- Target Equipment Profiles: Utility steam turbine generators, industrial gas expanders, turbo-compressor trains, and large induction motors.
- Application Scenarios: Continuous reverse-rotation tracking, phase-angle reference tracking, zero-speed safety interlocking, and rotor deceleration mapping.
- Diagnostic Tracking: Selectable manual hysteresis adjustment ranging from 0.2V to 2.5V to eliminate signal harmonic noise.
- Alarm Delay Control: Discrete dual-level alarm timers with Alarm 2 resolution adjustable down to 0.1-second intervals.
Shipping, Logistics & 12-Month Warranty Terms
- Package Checklist: Includes one Bently Nevada 3500/50M main tachometer monitor card and one rear I/O module with internal terminations.
- 12-Month Warranty Protection: Oiltech Controls Limited secures this item with a full 1-year replacement warranty valid from the date of site delivery.
- International Carrier Options: Rapid dispatch worldwide handled exclusively via FedEx, UPS, or DHL air express lines.
Industrial Procurement & Technical FAQ
- What are the critical hardware compatibility rules when introducing the 3500/50M-01-00 to an old rack?
You must check your 3500/01 configuration software version. It requires Version 4.20 or later, alongside module firmware revision 5.30. It will fail to initialize if paired with an old 3500/20 interface card. - How do the signal requirements differ between passive magnetic pickups and active proximity probes?
Proximity probes capture ultra-slow rotation down to 0.0167 Hz (1 RPM). In contrast, passive magnetic pickups require a minimum input frequency of 3.3 Hz to generate the necessary voltage amplitude. - Can a short circuit on the analog recorder outputs disrupt the primary machine trip logic?
No. The +4 to +20 mA recorder loops are electronically isolated. A direct short circuit across the recorder terminals will not affect monitor operation or alarm processing. - How do I configure the card to detect rapid rotor acceleration during startup?
You must program the module channel type via software to Rotor Acceleration mode, ensuring your Keyphasor or multi-tooth event count per revolution is set within the 1 to 255 event limit. - What is the main benefit of buying the internal termination option over external termination blocks?
The 01 internal termination option allows field transducer wires to land directly on the rear I/O module connectors. This eliminates external DIN-rail terminal assemblies, reducing intermediate connection failure points.
Technical Documentation Download
Review the internal loop wiring parameters and sensor threshold requirements before field installation:
- Please reach out to our team to obtain the comprehensive Bently Nevada 3500 series installation manual.
- To request a formal commercial quotation or availability status updates, email info@oiltechcontrols.com.
- Connect directly with an application engineering specialist via WhatsApp at +86 158 8020 0923.
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