Introduction to the 3500/60 133827-01
The Bently Nevada 3500/60 133827-01 is a Speed Monitor module for the 3500 Machinery Monitoring and Protection System. This module is specifically designed to monitor the rotational speed (RPM) and phase angle of rotating machinery. It processes signals from magnetic pickups (MPUs), proximity probes, or photoelectric sensors to provide accurate speed measurements. The 3500/60 is a critical protection module used for overspeed protection, underspeed detection, and for providing timing references (via Keyphasor simulation) for other monitoring modules within the rack. It is essential for safeguarding turbines, compressors, and other high-speed machinery where speed is a primary control and safety parameter.
Technical Parameters
The key technical specifications for the 3500/60 Speed Monitor are as follows:
| Parameter | Specification |
|---|---|
| Part Number | 3500/60 133827-01 |
| Description | Speed Monitor (Dual Channel) |
| Channels | 2 independent speed monitoring channels |
| Input Type | Accepts signals from Magnetic Pickups (MPUs), Proximity Probes, or other speed sensors. |
| Speed Range | From zero speed to a high maximum (e.g., 99999 RPM), configurable for the application. |
| Key Functions | Overspeed & Underspeed detection, Zero Speed detection, Rate-of-Change, and Keyphasor simulation. |
| Alarm Settings | User-configurable setpoints for Alert and Danger (Trip) for various speed-based conditions. |
| Power Supply | Powered by the 3500 rack backplane. |
| Dimensions (H x W x D) | Approx. 70 mm x 213 mm x 200 mm (Occupies one slot in a standard 3500 rack frame) |
| Weight | Approx. 1.5 kg (3.3 lbs) |
| Mounting | Installs in any compatible slot (except the two left-most power supply slots) of a 3500 rack frame. |
| Communication | Configures and communicates via the 3500 rack framework. |
| Operating Temperature | 0°C to +65°C (32°F to 149°F) |
| Compatibility | Fully compatible with other 3500 series modules and supported by System 1® software. |
Application Scenarios
The 3500/60 monitor is deployed wherever precise speed monitoring and protection are critical for machine safety and operation.
Overspeed Protection for Turbines:
Gas & Steam Turbines: This is its most critical application. It continuously monitors turbine speed and initiates an immediate shutdown (trip) if the speed exceeds a pre-set dangerous limit, preventing catastrophic mechanical failure.
Hydro Turbines: Protecting hydroelectric turbines from runaway speed conditions.
Compressor and Pump Control:
Monitoring the speed of large centrifugal compressors and pumps for control purposes and to protect against overspeed conditions.
Providing critical permissive signals (e.g., "zero speed") to ensure a machine has completely stopped before allowing maintenance.
Turbo-expanders and Critical Motors:
Protecting high-speed turbo-expanders used in process industries and monitoring the speed of large driven equipment.
Sequencing and Control:
Providing speed-based signals for engine start sequencing or for engaging clutches and other auxiliary systems at specific speeds.
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