Application Scenarios
In a large steam turbine generator set at a power plant, the axial position of the rotor relative to the thrust bearing must be continuously monitored. Excessive axial displacement indicates thrust bearing wear or steam force imbalance—conditions that can cause catastrophic rotor-to-stator contact if not detected early. The 1440-TPS02-01RB connects to eddy current proximity probes mounted on the turbine casing and processes their signals to provide real-time position measurements. When displacement exceeds a configured danger threshold, the module’s relay output activates a trip signal, protecting the turbine from mechanical damage.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1440-TPS02-01RB |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Category | Position Measurement Module (XM-320) |
| Number of Channels | 2 independent channels |
| Input Signal Types | Eddy current transducers, LVDT, voltage signals |
| Transducer Power | Isolated 24V DC, user-configurable for +24V or −24V wiring |
| Output Signals | Two isolated 4…20 mA outputs (max load 600 Ω); buffered outputs one per channel |
| Communication | DeviceNet (125/250/500 Kbps auto-set); RS-232 serial (19.2 Kbps) for local config |
| Relay Output | 1 on-board DPDT relay; expandable to 4 additional relays with XM-441 module |
| Module Power | 24V DC, 200 mA max, 165 mA typical |
| Operating Temperature | −20°C to 65°C |
| Dimensions (H×W×D) | 97 × 94 × 94 mm |
| Terminal Base | 1440-TB-B |
Technical Principles and Innovative Values
- Multi-Mode Position Measurement Architecture: The 1440-TPS02-01RB supports three measurement modes—Normal (two independent channels), Head-to-Head, and Radial Cancel—allowing adaptation to different turbine supervisory configurations without hardware changes. This flexibility reduces inventory requirements and simplifies engineering for varying machine geometries.
- Integrated Delta Time Buffer for Fault Diagnosis: The module captures 2,048 records of position data at intervals configurable from 1 to 3,600 seconds, triggered by relay activation or a DeviceNet command. This forensic capability enables engineers to reconstruct the conditions leading up to a trip event, accelerating root-cause analysis and reducing investigation time.
- Advanced Alarm and Setpoint Logic: Two alarm/danger pairs per channel support “greater than,” “less than,” “inside range,” and “outside range” operators with configurable hysteresis. Startup inhibit and setpoint multiplication functions allow temporary alarm suppression during turbine startup, preventing nuisance trips during transient conditions.
Reviews
There are no reviews yet.