Introduction
The assembly 3500/42M-04-00 135489-01 is a Turbine Supervisory Monitor (TSM) and its associated Speed Input Card for the Bently Nevada 3500 Machinery Protection System. The 3500/42M is a versatile, modular monitor chassis designed to handle a variety of transducer inputs. Paired with the 135489-01 input card, this assembly is specifically configured for speed monitoring and overspeed protection. It processes signals from magnetic pickups (MPUs) or proximity probes to provide accurate rotor speed measurement, which is critical for machine control, sequencing, and protection against catastrophic overspeed events.
Parameters / Specifications
The following table outlines the key technical parameters for this speed monitoring assembly.
| Parameter | Specification |
|---|---|
| Assembly Designation | 3500/42M-04-00 (Monitor) & 135489-01 (Input Card) |
| Description | Turbine Supervisory Monitor with Speed Input Card |
| Monitor: 3500/42M-04-00 | |
| Physical Dimensions (H x W x D) | Approx. 190 mm x 40 mm x 120 mm (Standard 3500 Series frame slot) |
| Weight (Monitor) | Approx. 0.5 kg (1.1 lb) |
| Primary Function | Programmable Monitor for Speed and Overspeed Protection |
| Input Channels | Configurable (typically 2 channels) based on installed input cards |
| Power Supply | Powered by the 3500 rack |
| Operating Temperature | 0°C to +65°C (32°F to 149°F) |
| Input Card: 135489-01 | |
| Description | Speed Input Card |
| Compatible Inputs | Magnetic Pickups (MPUs), Proximity Probes |
| Key Measurements | Rotor Speed, Overspeed Detection |
| Speed Range | Configurable, typically from 0 to over 20,000 RPM |
| Overspeed Function | Dedicated, highly reliable overspeed detection setpoint |
| Total Assembly Weight | Approx. 0.6 kg (1.32 lb) |
*Note: The specific configuration, including speed ranges, overspeed setpoints, and alarm delays, is defined by the "-04-00" suffix and the system's software setup. The 135489-01 card is optimized for processing the AC signals from speed sensors.*
Application Scenarios
This speed monitoring assembly is crucial for protecting machinery where speed measurement and overspeed protection are paramount.
Turbine Overspeed Protection:
The primary application is as a dedicated overspeed protection system for steam and gas turbines. It provides a highly reliable trip signal to the turbine control system to prevent catastrophic failure in the event of an overspeed condition.
Compressor and Pump Speed Monitoring:
Used to monitor the running speed of critical compressors and pumps for control purposes and to ensure they operate within their safe speed envelope.
Zero Speed Detection:
Can be configured to provide a "Zero Speed" signal to indicate that a machine has completely coasted to a stop, which is often an interlock for starting auxiliary systems like turning gear.
API 670 Compliant Machinery Protection:
Serves as the monitoring and alarm unit for speed channels in a machinery protection system designed to meet API 670 standards, providing reliable and standardized protection.
Sequencing and Control Logic:
Provides critical speed signals for machine sequencing during startup and shutdown, such as enabling lube oil pumps at certain speeds or initiating load shedding.
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