Product Introduction: 3500/64M 140734-05
The 3500/64M 140734-05 is a TMR (Triple Modular Redundant) Digital Speed Input Module for the Bently Nevada 3500 Machinery Protection System. This module is a highly reliable, fault-tolerant component designed to monitor shaft speed and provide critical overspeed protection. It accepts signals from multiple speed sensors (typically magnetic pickups) and uses a triple-redundant (TMR) voting architecture to process the data. This design ensures that a single failure within the module itself will not cause a spurious trip or a failure to trip on a genuine overspeed condition, making it ideal for protecting critical turbomachinery where overspeed events can be catastrophic.
Technical Parameters
The key technical parameters for the 3500/64M 140734-05 module are summarized in the table below.
| Parameter Category | Specification |
|---|---|
| Model & Part Number | 3500/64M 140734-05 |
| Module Type | TMR (Triple Modular Redundant) Digital Speed Input |
| Input Channels | 3 independent sensor input channels (for TMR voting on a single shaft). |
| Input Signal Type | Magnetic Pickup (MPU) or other digital pulse train. |
| Speed Measurement Range | From 0 RPM to the maximum capable range of the sensors (e.g., >20,000 RPM). |
| Trip Logic | 2-out-of-3 (2oo3) voting per measurement point for high fault tolerance. |
| Safety Certification | Designed to meet IEC 61508 SIL 2 / SIL 3 requirements for safety-related systems. |
| Module Dimensions (H x W x D) | Approx. 190 mm x 60 mm x 140 mm (7.5 in x 2.4 in x 5.5 in) [Standard 3500 rack slot] |
| Module Weight | Approx. 0.8 kg (1.8 lbs) |
| Mounting | Slides into a single slot in a 3500 series rack. |
| Power Requirement | Powered by the 3500 rack backplane. |
| Operating Temperature | 0°C to +65°C (+32°F to +149°F) |
| Key Features | • Prevents spurious overspeed trips • Ensures trip on demand for genuine overspeed • Continuous self-diagnostics • Configurable ramp rates and delay times |
Note: The dimensions and weight are standard for a module in a 3500 series frame. The specific speed ranges and voting logic are configured via the 3500 configuration software.
Application Scenarios
The 3500/64M TMR Digital Speed Module is deployed in the most critical applications where reliable overspeed protection is non-negotiable.
Turbine Overspeed Protection: The primary application is for protecting gas turbines and steam turbines from catastrophic overspeed events, which is the most critical protection function for these assets.
Compressor and Turbo-expander Protection: Monitoring and protecting high-speed compressors and turbo-expanders in critical process service.
Safety Instrumented Systems (SIS): Serving as the primary sensor interface and logic solver for the overspeed protection function within a SIL 2 or SIL 3 certified safety loop.
Aero-derivative and Heavy-duty Gas Turbines: Where the consequences of overspeed are severe and the highest level of reliability is required from the protection system.
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