Application Scenarios
On a large induced-draft fan serving a power-plant boiler, bearing degradation can escalate from a minor vibration anomaly to catastrophic rotor failure in a matter of hours. Maintenance teams that rely on quarterly handheld vibration surveys routinely miss the window between the onset of imbalance and the point of no return. The 1440-VDRS06-06RH closes that gap: six points on the fan — drive-end and non-drive-end bearings on the motor and rotor, plus the gearbox — are wired to IEPE accelerometers, and the module continuously computes the overall vibration value between its selectable high-pass and low-pass filters. When a value crosses the configured Alert or Danger setpoint, the corresponding 4–20 mA output moves out of range and the channel indicator shifts from yellow to red, while the DeviceNet master reports the event to the plant asset-management system. The net effect is a protection layer that sees the fault developing in real time rather than during the next scheduled route.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1440-VDRS06-06RH |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Category | Direct (overall) vibration monitoring module |
| XM Designation | XM-161 — Direct Vibration with 4–20 mA Outputs |
| Input Channels | 6 dynamic vibration / proximity channels |
| Supported Input Signals | IEPE accelerometer, eddy-current transducer (probe), AC-coupled dynamic voltage (velocity or pressure transducer) |
| Sensor Excitation | IEPE constant current 2.69 mA ±20%, sourced from 24 V DC |
| Sensitivity | User-configurable in software |
| Input Impedance | >100 kΩ |
| A/D Conversion | 12-bit |
| Measurement Range | 0…2 ips RMS (integrated 100 mV/g accelerometer @ 1 kHz); 0…20 g RMS; 0…15.6 mils peak (200 mV/mil probe) |
| Measurement Units | Volts, g, ips, mm/s, mils, µm, PSI, Pa |
| Frequency Response | Accuracy ±5% FS over 3 Hz…1 kHz; +5/–10%; ±1% FS typical at 1…5 kHz |
| Low-Pass Filter | 1 kHz or 5 kHz selectable, 2-pole 0.1 dB Chebyshev |
| High-Pass Filter | 3.0 Hz or 10.0 Hz selectable, 2-pole 0.1 dB Chebyshev |
| Overall Low-Pass Filter | 1-pole, –3 dB @ 10 kHz |
| Integrator | Single-stage, selectable; –0.3 dB @ 3 Hz |
| Overall Value Types | RMS; Peak (true or calculated); Peak-to-Peak (true or calculated) |
| Buffered Outputs | 1 active buffer per channel; output impedance 500 Ω; –3 dB @ 16 kHz (down 5% @ 5 kHz) |
| 4–20 mA Outputs | 2 isolated banks of 3 outputs, one per channel; max load 600 Ω; non-powered (external loop supply 7…36 V required) |
| Analog Output Accuracy | ±0.5% FS maximum; ±0.2% FS typical |
| Analog Response Time | 1.5 s (3τ) |
| Alarms | One per channel; operators: greater than / less than / inside range / outside range; user-configurable hysteresis |
| Discrete Switch Input | Relay reset and setpoint multiplier; non-isolated, switch to ground (24 V COM); max 5.1 mA |
| Indicators | Module — red/green; Network — red/green; Channel 1–6 — yellow/red |
| Communication | DeviceNet (standard protocol; EDS file available); RS-232 at 19.2 Kbps for local serial configuration |
| DeviceNet Baud Rate | 125 / 250 / 500 Kbps, set by bus master |
| Configuration | XM Serial Configuration Utility via RS-232 or DeviceNet; nonvolatile memory retains configuration through power cycles |
| Supply Voltage | 24 V DC, Class 2 / SELV |
| Current Consumption | Max 310 mA @ 24 V DC |
| Power Dissipation | Max 7.44 W @ 24 V DC (7.0 W @ 18 V; 8.0 W @ 32 V) |
| Terminal Base | 1440-TB-H (module mounts via key-switch and 96-pin connector) |
| Mounting | DIN rail (terminal base); open-style module |
| Dimensions (H × W × D) | 97 × 94 × 94 mm (3.8 × 3.7 × 3.7 in.) |
| Weight | Approx. 0.17 kg (0.37 lb) |
| Operating Temperature | –20…65 °C (–4…149 °F); max surrounding air 65 °C |
| Storage Temperature | –40…85 °C (–40…185 °F) |
| Humidity | 5…95% RH, non-condensing |
| Operating Vibration | 2 g @ 10…500 Hz |
| Operating Shock | 15 g; non-operating 20 g |
| EMC / Environmental | CISPR 11 Class A; IEC 61000-4-2 (ESD 8 kV air), IEC 61000-4-3 (radiated RF 10 V/m), IEC 61000-4-4 (EFT ±2 kV), IEC 61000-4-5 (surge ±2 kV), IEC 61000-4-6 (conducted RF 10 V rms) |
| Isolation Voltage | Not rated |
| Hazardous Location | T4 temperature code (North American and IEC) |
| Certifications | CE, UL, cUL, C-Tick, KC, Marine (per XM family documentation) |
| Lifecycle Status | Discontinued / obsolete — discontinued 30 December 2016; supplied as new surplus or tested used |