Introduction to the 3500/50-04-00 136703-01
The Bently Nevada 3500/50-04-00 136703-01 is a Thrust Position Monitor module for the 3500 Machinery Monitoring and Protection System. This module is specifically designed to monitor the axial position of a rotor, a critical parameter for detecting thrust bearing wear and preventing catastrophic failure in machines with significant axial loads. It typically uses two opposing proximity probes to measure the position of the rotor's thrust collar. By monitoring the differential position, it can detect if the rotor is shifting beyond its safe operating limits, providing both early warning (Alert) and immediate shutdown (Danger/Trip) commands to protect the machine.
Technical Parameters
The key technical specifications for the 3500/50-04-00 Thrust Position Monitor are as follows:
| Parameter | Specification |
|---|---|
| Part Number | 3500/50-04-00 136703-01 |
| Description | Thrust Position Monitor (Dual Channel) |
| Channels | 2 independent monitoring channels (for two opposing probes) |
| Input Type | Accepts signals from two proximity probes. |
| Measured Parameter | Axial Shaft Position (Thrust Position) |
| Measurement | Monitors the differential position to determine rotor movement towards either active or inactive thrust bearing. |
| Dynamic Signals | Provides buffered output of Gap Voltage for each probe. |
| Alarm Settings | User-configurable Alert and Danger (Trip) setpoints for both directions of axial movement. |
| 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 3500/50 monitor is critically important for protecting machinery where axial thrust forces are generated during operation.
Steam and Gas Turbines:
Protecting turbines from excessive axial movement that could cause blade rubbing, diaphragm damage, or catastrophic thrust bearing failure.
Centrifugal and Axial Compressors:
This is a primary application. Compressors generate significant axial thrust, and the 3500/50 is essential for monitoring thrust bearing wear and preventing rotor seizure or bearing wipe.
Large Pumps:
Monitoring multi-stage centrifugal pumps, such as boiler feed pumps, which are subject to high axial forces. The module protects against thrust bearing failure caused by impeller wear or pressure imbalances.
Marine Propulsion Systems:
Monitoring the thrust position on the main propulsion turbines or gearboxes of ships.
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