Introduction to Part 3500/62-01-00 163179-03
The 3500/62-01-00 is a Speed Monitor / Tachometer Module for the Bently Nevada 3500 system. Its primary function is to monitor the rotational speed (RPM) of a shaft using signals from a Keyphasor transducer (like a proximity probe or magnetic pickup). It provides critical speed-related protection functions, including overspeed and underspeed detection, by comparing the measured speed against user-configured setpoints. This module is essential for protecting turbomachinery during startup, shutdown, and normal operation.
Parameters / Specifications
The key technical parameters for the 3500/62-01-00 module are summarized in the table below.
| Parameter | Specification | Notes / Explanation |
|---|---|---|
| Model Number | 3500/62-01-00 | Bently Nevada Speed Monitor / Tachometer Module |
| Assembly/Revision Code | 163179-03 | Manufacturer's internal assembly number. |
| Product Type | Rack-Mount Monitoring Module | |
| Compatible Rack | Bently Nevada 3500 Rack | Requires a 3500 series frame for operation. |
| Module Slot Size | Single Slot | Occupies one slot in the 3500 rack. |
| Dimensions (H x W x D) | Approx. 193mm x 55mm x 200mm | Standard dimensions for a 3500 series module. |
| Weight | Approx. 0.6 kg (1.3 lbs) | |
| Power Requirement | +24 VDC (from rack backplane) | Powered by the main rack power supplies. |
| Input Signal | • From 3500/25 Keyphasor Module (TTL Pulse) • Direct from Magnetic Pickup (MPU) | Accepts a digital pulse or raw MPU signal. |
| Speed Range | 0 to 9999 RPM (or higher, model-dependent) | Capable of monitoring from zero speed to very high RPM. |
| Setpoints | 2 or 4 Programmable Setpoints (Danger, Alert, etc.) | Used for Overspeed, Underspeed, or Zero Speed detection. |
| Outputs | Relay Outputs for each Setpoint | Form A or Form C relays to trip machinery or activate alarms. |
| Accuracy | High (e.g., ±1 RPM) | Suitable for critical overspeed protection. |
| Front Panel Indicators | OK, Alert, Danger, Bypass, Power | LED status indicators for module and channel status. |
| Operating Temperature | -20°C to +65°C | Standard for industrial monitoring hardware. |
Application Scenarios
The 3500/62 Speed Monitor is a critical protection module used in a wide range of industries where rotational speed is a key parameter for machine safety and reliability.
Overspeed Protection: The primary application is to prevent catastrophic failure by tripping the machine (e.g., a steam or gas turbine) if its speed exceeds a safe maximum limit.
Turbine Control: Monitoring speed during startup and shutdown sequences, ensuring the machine passes through critical speeds quickly and operates within safe ranges.
Compressor and Pump Monitoring: Protecting large compressors and pumps from damage due to underspeed conditions or loss of prime, which can lead to mechanical issues.
Zero Speed Detection: Used in systems like lube oil pumps to confirm that a shaft has completely stopped before initiating maintenance or other procedures.
Casualty Monitoring: Ensuring that driven equipment (like a generator) does not motor the prime mover after a trip event.
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