Description
Bently Nevada 3500/25-01-05-01 Keyphasor Module
The Bently Nevada 3500/25-01-05-01, also cataloged as the 3500/25 Keyphasor module, operates as a dedicated hardware component for phase reference acquisition within the 3500 Machinery Protection System. It processes shaft-mounted proximity probe or magnetic pickup signals into TTL-compatible pulse trains for downstream vibration and speed calculation across the 3500 rack architecture.
Hardware Specifications
| Parameter |
Specification |
| Model |
3500/25-01-05-01 |
| Brand |
Bently Nevada |
| Origin |
USA |
| Operating Temp |
-30 deg C to +65 deg C |
| Power Consumption |
Provided by 3500 rack |
| Module Type |
Two-Channel Keyphasor Module |
| Channels |
2 independent inputs |
| Input Types |
Proximity probes, magnetic pickups |
| Signal Range |
±50 V input capability |
| Pulse Output |
TTL-compatible digital pulses |
| Speed Range |
1 to 120000 RPM |
| Communication |
3500 rack / System 1 |
Eddy Current Phase Reference Conditioning (Bently Nevada Specific Behavior)
The module processes eddy-current probe signals into conditioned timing edges for once-per-revolution indexing.
It performs signal threshold shaping to stabilize phase reference integrity under variable shaft amplitude conditions.
Cross-channel phase alignment supports synchronous averaging and orbit reconstruction within System 1 analytics.
Frequently Asked Questions (FAQ)
Q: Can the module operate with both proximity probes and magnetic pickups simultaneously?
A: Yes. Each channel accepts either input type independently, but signal conditioning is channel-specific.
Q: Does the module generate TTL pulses directly from analog probe signals?
A: Yes. Internal conditioning converts ±50 V analog inputs into TTL-compatible phase pulses.
Q: Is phase output affected during hot-swap operations?
A: If redundant channel configuration exists, phase reference continues through the active channel without interruption.
Field Installation Guidelines
Ensure Keyphasor input cables are routed separately from high-noise power conductors.
Maintain shield termination at rack ground reference point to minimize phase jitter.
Verify probe polarity and gap alignment before commissioning.
Use approved 3500 rack slot insertion procedures to avoid backplane contact stress.
