Key Technical Specifications
| Parameter | Details |
|---|---|
| Order number | 1900/65A-01-02-01-00-00 |
| Product family | Bently Nevada 1900/65A General Purpose Equipment Monitor |
| Vibration inputs | 4 channels; configurable for 2-/3-wire accelerometers, velocity sensors or proximity sensors |
| Temperature inputs | 4 channels; Type E, J, K, T thermocouples; 2-/3-wire RTD |
| Relay outputs | 6 configurable relays with voting logic |
| Analog outputs | 4 × 4–20 mA recorder outputs |
| Buffered outputs | Dedicated buffered output per transducer input |
| Communication | Modbus via Ethernet; software-configurable RS232/485 serial port |
| ADC / bandwidth | 24-bit ADC; up to 25 kHz bandwidth |
| Alarm levels | Alert and Danger per channel/variable |
| Power supply | 18–36 V DC (optional 110–220 V AC external supply) |
| Mounting | DIN rail or bulkhead |
| Monitor module size | 196.9 × 149.4 × 74.4 mm (7.75 × 5.88 × 2.93 in) |
| Configuration | 1900 Configuration Software via Ethernet |
| Status | Discontinued / surplus; verify suffix code and firmware revision |
Product Introduction
Bently Nevada 1900/65A-01-02-01-00-00 is a stand-alone general purpose equipment monitor from the 1900/65A family. It provides continuous vibration and temperature monitoring, alarm processing, relay protection and 4–20 mA outputs for pumps, fans, compressors, motors and auxiliary rotating equipment.The 1900/65A is not a rack-based 3500 system module. It runs as a compact DIN-rail or bulkhead-mounted monitor with up to four processed variables per channel, configurable filtering, and Modbus connectivity for DCS, SCADA or PLC integration. The suffix “-01-02-01-00-00” defines communication, display and option content, so replacement units must match the installed configuration or be reconfigured with the 1900 Configuration Software.
Installation & Configuration Guide
Preparation (10 min)
- Photograph the nameplate, terminal labels and current wiring.
- Confirm power source: 18–36 V DC is standard; AC supply requires the correct external option.
- Identify sensor types before connecting: accelerometer, velocity, proximity probe, thermocouple or RTD.
- Download the existing configuration if the unit is still communicating.
Removal (5–10 min)
- De-energize the 24 V DC supply unless a documented hot-work procedure exists.
- Label every terminal before disconnecting.
- Remove DIN rail or bulkhead mounting hardware.
- Store the module in an ESD-safe bag; the front connectors are sensitive to contamination.
Installation (10 min)
- Mount the replacement 1900/65A-01-02-01-00-00 in the same orientation.
- Reconnect transducer, temperature, relay and 4–20 mA wiring per original labels.
- Verify 24 V DC polarity and measure supply voltage before energizing.
- Connect Ethernet for configuration if Modbus is enabled.
Power-On & Test (10 min)
- Apply power and confirm normal LED/status indication.
- Upload or verify the configuration file.
- Check each transducer channel for valid reading and noise level.
- Simulate Alert/Danger conditions to verify relay operation.
- Confirm 4–20 mA outputs and Modbus register values.
- Monitor for 30 minutes under normal operating conditions.
Troubleshooting Quick Reference
| Symptom | Likely cause | First check |
|---|---|---|
| No power LED | Missing or reversed 24 V DC | Measure supply at terminals; confirm 18–36 V DC |
| One channel fault | Sensor wiring or sensor failure | Check cable shield, gap voltage or accelerometer bias |
| All channels noisy | Ground loop or poor shielding | Verify single-point shield grounding |
| Relay does not trip | Wrong setpoint or inhibited relay | Review Alert/Danger setpoints and voting logic |
| Modbus not responding | IP conflict or wrong serial settings | Confirm Ethernet IP, baud rate and RS232/485 mode |
| Configuration lost | Non-volatile memory mismatch | Re-download configuration from 1900 Configuration Software |
| Temperature channel reads open | Broken RTD/TC wiring | Check thermocouple polarity or RTD lead count |
Dimensions, Mounting & Wiring Notes
- Monitor module: 196.9 × 149.4 × 74.4 mm (7.75 × 5.88 × 2.93 in).
- With display module: 196.9 × 149.4 × 97.8 mm (7.75 × 5.88 × 3.85 in).
- Mounting: DIN rail or bulkhead; keep clearance around terminals for wiring and heat dissipation.
- Power: 18–36 V DC preferred for industrial panels; verify AC option if present.
- Sensor wiring: Shielded cable required; proximity probe systems need correct gap voltage.
- Relay outputs: Confirm contact rating and load type before connecting trip circuits.
FAQ
Can I replace any 1900/65A with 1900/65A-01-02-01-00-00?
Not automatically. The base hardware is the same family, but the suffix controls communication, display and option content. Match the suffix or reconfigure the unit before commissioning.Does this module support Modbus to a PLC or DCS?
Yes. The 1900/65A can provide Modbus communication over Ethernet or a configurable RS232/485 serial port, depending on option configuration.Is this a 3500 rack module?
No. The 1900/65A is a stand-alone monitor. It does not plug into a 3500 rack and cannot replace a 3500/40M, 3500/22 or 3500/25 module.What sensors can it accept?
Up to four transducer inputs configurable for 2-/3-wire accelerometers, velocity sensors or Bently Nevada proximity sensors, plus four temperature inputs for thermocouples and RTDs.I lost the configuration file. Can the unit still work?
It may retain its last configuration in non-volatile memory. If not, you must rebuild it using the 1900 Configuration Software and the original setpoint records.Do you test these before shipping?
Yes. Each unit undergoes power-up, communication handshake, I/O simulation and relay verification. Function is verified under test conditions; final performance depends on site sensors and configuration.
