Overview
Functional Characteristics
The module handles transducer signals used to monitor machinery operating conditions. Its four-channel capacity supports multiple measurement channels within the monitoring rack. The actual measurement function and supported sensor arrangement must match the installed module configuration.
The listed gap filter has a -3 dB point at 0.09 Hz. This parameter describes the filter’s frequency response near the specified cutoff. The Smax range and vector filter characteristics define additional signal-processing conditions for the documented configuration.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 3500/42 125672-02 |
| Brand | Bently Nevada |
| Product Family | 3500 System |
| Component Type | Machinery Monitoring Module |
| Channel Capacity | 4 channels |
| Rack Space | One full-height slot |
| Input Type | Condition-monitoring transducer |
| Signal Inputs | 1 to 4 proximity transducer inputs |
| Gap Filter | -3 dB at 0.09 Hz |
| Smax Range | 0.125 to 15.8 times running speed |
| 1X and 2X Vector Filter | Constant Q filter |
| Minimum Stopband Rejection | -57.7 dB for 1X and 2X vector filtering |
| Input Impedance | 10 kOhm, standard |
| Output Impedance | 550 Ohm |
| Voltage Compliance | 0 to +12 VDC across load |
| Power Consumption | 7.7 W, typical |
Signal Processing and Configuration
The 1X and 2X vector filters separate vibration components associated with shaft rotational frequency and twice that frequency. These measurements can help maintenance teams assess vibration amplitude and phase. The Constant Q filter specification describes the filter response, while the minimum stopband rejection indicates attenuation outside the intended passband.
The Smax measurement represents the maximum shaft displacement derived from orthogonal probe measurements. Its usable range depends on the configured measurement and machine speed. The listed range should be checked against the intended operating conditions before selecting this module for a specific monitoring task.
Installation and Selection Considerations
The module uses one full-height slot in the 3500 rack. Before replacement, verify the complete part number, installed I/O module, transducer type, termination arrangement, and channel configuration. The main monitor and its associated I/O hardware must match the required signal inputs and measurement functions.
Frequently Asked Questions
Q: How many signal channels does the 3500/42 125672-02 support?
A: The module supports four monitoring channels and accepts between one and four signal inputs. The actual measurement functions depend on the channel configuration and installed transducer arrangement.
Q: What is the purpose of the 1X and 2X vector filters?
A: They isolate vibration components at shaft rotational frequency and twice shaft rotational frequency. The resulting amplitude and phase measurements can support machinery vibration analysis.
Q: What should be checked before replacing this module?
A: Confirm the complete part number, I/O module type, transducer compatibility, termination arrangement, and existing channel settings. Do not assume that matching the 3500/42 family designation alone confirms compatibility with every installed configuration.
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