Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | Bently Nevada 3500/62 |
| Product Type | 6-Channel Process Variable Monitor |
| Brand | Bently Nevada |
| Series | 3500 Machinery Protection System |
| Origin | Not specified in the provided data |
| Input Channels | 6 channels |
| Input Signal – Current | +4 to +20 mA |
| Input Signal – Voltage | -10 VDC to +10 VDC |
| Voltage Input Impedance | 1 Mohm typical |
| Current Input Impedance | 50 ohm |
| Measurement Accuracy | +/- 0.33% of full scale typical; +/- 1% maximum |
| Alarm Setpoints | Alert and Danger, programmable from 0% to 100% of full scale |
| Alarm Setpoint Accuracy | Within 0.13% of the desired value |
| Alert Time Delay | 1 to 60 seconds, adjustable in 1-second increments |
| Danger Time Delay | 0.5 to 60 seconds |
| Power Consumption | 7.0 W typical, depending on configuration |
| Transducer Power Supply | +24 VDC +/- 5% at 250 mA maximum, internal barrier I/O only |
| Operating Temp | -30 deg C to +65 deg C |
| Storage Temp | -40 deg C to +85 deg C |
| Humidity | Up to 95%, non-condensing |
| Dimensions | 241.3 mm x 24.4 mm x 241.8 mm |
| Weight | 0.82 kg |
Process Variable Signal Processing
The 3500/62 conditions incoming analog signals before comparing measured values with configured alarm thresholds. Therefore, each channel can monitor a separate process variable while the rack evaluates Alert and Danger conditions.
The module supports both current and voltage signal interfaces. Current inputs use a 50 ohm input impedance, while voltage inputs present a 1 Mohm typical impedance. This arrangement allows the monitor to interface with standard process transmitters and proportional voltage sources.
The monitor provides programmable alarm logic for both under-limit and over-limit conditions. Additionally, configurable time delays prevent short-duration signal excursions from immediately producing an alarm condition.
For installations using internal barrier I/O, the module can provide +24 VDC +/- 5% at up to 250 mA for compatible transducer circuits. The exact I/O configuration must match the selected 3500/62 hardware arrangement.
Frequently Asked Questions
Q: How many process variables can one 3500/62 module monitor?
A: The module provides six independent input channels for process variable monitoring.
Q: What analog signals can the 3500/62 accept?
A: It accepts +4 to +20 mA current signals and proportional voltage signals from -10 VDC to +10 VDC.
Q: Can the alarm response time be configured?
A: Yes. Alert delay can be configured from 1 to 60 seconds, while Danger delay ranges from 0.5 to 60 seconds.
Field Installation Guidelines
- Install the monitor in an approved Bently Nevada 3500 rack position and follow the rack wiring arrangement.
- Verify the selected I/O module configuration before connecting field wiring.
- Match each transmitter output range with the corresponding channel configuration.
- Route analog signal wiring separately from high-voltage and high-current conductors where practical.
- Use appropriately shielded instrumentation cable for low-level analog signals.
- Terminate cable shields according to the plant grounding design and avoid creating unintended ground loops.
- Verify signal polarity before energizing the input circuits.
- For voltage inputs, confirm that the external source remains within the specified -10 VDC to +10 VDC range.
- For 4-20 mA circuits, verify loop wiring and transmitter supply requirements before commissioning.
- Confirm Alert and Danger setpoints through the 3500 Rack Configuration Software before placing the channel into service.
- Check the front-panel OK, TX/RX, and Bypass indicators during commissioning.
- After installation, verify each channel against the connected process transmitter or calibrated signal source.
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