Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3500/77M 176449-07 |
| Base Model | 3500/77M |
| Brand | Bently Nevada |
| Product Type | Recip Cylinder Pressure Monitor |
| Series | 3500 Reciprocating Compressor Monitoring System |
| Input Channels | Four |
| Input Signal | Cylinder pressure transducers |
| Measured Variables | Peak compression and tension |
| Rod Reversal Output | Degree of rod reversal |
| Recorder Output | 4-20 mA |
| Recorder Load | 600 ohm maximum |
| Recorder Update | 100 ms or less |
| Buffered Outputs | One coaxial output per channel |
| Channel Configuration | Rack configuration software |
| Alarm Functions | Alert and Danger levels |
| Rack Allocation | One full-height front slot |
| Companion I/O | Cylinder pressure I/O module |
Reciprocating Machinery Signal Processing
The 3500/77M receives cylinder pressure transducer signals through the associated cylinder pressure I/O module. Its four-channel configuration supports measurement of peak compression and tension values. The monitor also provides degree-of-rod-reversal output for reciprocating machinery analysis.
The recorder interface provides a 4-20 mA output with a maximum recorder load of 600 ohm. Recorder updates occur at 100 ms or less according to the supplied specification. Each channel also provides one coaxial buffered output for signal access.
Frequently Asked Questions
Q: How many cylinder pressure input channels does the 3500/77M 176449-07 provide?
A: The supplied specification identifies four input channels for cylinder pressure transducers.
Q: What electrical recorder output is provided?
A: The monitor provides a 4-20 mA recorder output with a maximum specified recorder load of 600 ohm.
Q: Does the monitor require a separate I/O module?
A: Yes. The specified companion I/O is a cylinder pressure I/O module. Confirm the installed rack and I/O configuration before wiring.
Field Installation Guidelines
Install the monitor in the designated full-height front slot of the compatible 3500 rack. Verify the rack configuration software settings before commissioning the channels.
Connect cylinder pressure transducer wiring through the specified cylinder pressure I/O module. Keep transducer signal wiring separated from high-current power conductors and other strong electrical noise sources. Follow the installed system grounding and shield termination practices.
Verify channel assignment, recorder output wiring, buffered coaxial connections, and alarm configuration before applying the monitor to operating machinery. Confirm that the connected transducers and I/O module match the configured channel requirements.
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