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Key Technical Specifications
| Parameter | Value |
|---|---|
| Model Number | 135473-01 |
| Manufacturer | Bently Nevada, a Baker Hughes business |
| Product Series | 3500 Machinery Protection System |
| Associated Front Monitor | 3500/25 Enhanced Keyphasor Module |
| Product Type | Keyphasor I/O module with internal barriers and internal terminations |
| Channel Capacity | Two Keyphasor input channels |
| Associated 3500/25 Order Code | 3500/25-01-03-00, subject to site approval option |
| Field Termination Type | Internal terminations on the rear I/O module |
| Barrier Type | Internal barrier interface |
| Primary Input Sources | Proximity-probe/Proximitor systems or magnetic pickups, subject to configured monitor application |
| Primary Signal Function | Shaft-speed and phase-reference signal interface |
| System Role | Converts input events into digital Keyphasor reference signals for the 3500 rack |
| 3500 System Capacity | Up to four Keyphasor signals in normal configuration; up to eight in paired configuration |
| Typical Monitor Power Consumption | 3.2 W typical for the associated 3500/25 Enhanced Keyphasor Module |
| Operating Temperature | 0 to +65 °C when used with the internal-barrier I/O version |
| Storage Temperature | −40 to +85 °C |
| Humidity | Up to 95%, non-condensing |
| Associated Monitor Dimensions | 11.99 × 2.44 × 25.65 cm; front monitor dimensions, not the rear I/O module |
| Service Role | Rear I/O termination and isolation; it does not independently provide rack monitoring or alarm logic |
The 135473-01 is identified as the 3500/25 Keyphasor I/O Module with Internal Barriers and Internal Terminations. It is used with the half-height, two-channel Bently Nevada 3500/25 Enhanced Keyphasor Module. The system uses Keyphasor signals as shaft-speed and phase-reference inputs for monitor functions across the 3500 rack.
Product Introduction
The Bently Nevada 135473-01 is a rear Keyphasor I/O module for the 3500/25 Enhanced Keyphasor Module in a Bently Nevada 3500 Machinery Protection System. It provides internally terminated, internally barriered field connections for Keyphasor reference signals generated by proximity probes or magnetic pickups on rotating equipment.
This module is used where the machinery-protection system needs isolated shaft-speed and phase-reference signals without external barrier hardware. It supports two Keyphasor channels through the associated half-height 3500/25 monitor. Match the existing rear I/O module, internal-termination wiring method, barrier requirement, front-monitor order code, and site hazardous-area documentation before installation.
135473-01
135473-01
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| 3500 rack reports Keyphasor NOT OK | Failed proximity probe, failed magnetic pickup, open cable, shorted cable, incorrect sensor bias, loose I/O terminal | ✅ Medium | Identify the affected channel in the 3500 diagnostic display or Rack Configuration Software. Measure sensor supply and signal at the 135473-01 field terminals using the approved loop drawing. | Verify the field sensor and cable before replacing the I/O module. Most one-channel Keyphasor faults originate outside the rack. |
| Both Keyphasor channels fail together | Rear I/O module not seated, front 3500/25 monitor not seated, backplane issue, rack supply problem | ✅ High | Confirm the 3500/25 front monitor and corresponding 135473-01 rear module are fully seated in the same rack position. Check rack power and nearby monitor status. | Isolate rack power under the approved procedure, reseat both modules, and retest. Replace hardware only if the fault remains isolated to that slot. |
| Speed reading is zero while the machine rotates | No sensor output, incorrect target mark, excessive sensor gap, open circuit, wrong configuration | ✅ Medium | Use an oscilloscope or approved signal analyzer at the I/O terminals to confirm a changing Keyphasor waveform. Check the physical keyway, once-per-turn mark, and probe gap. | Correct target geometry and sensor gap before replacing the 135473-01. |
| Speed reading is unstable or jumps | Electrical noise, poor shield termination, loose terminal, damaged cable, irregular target surface, incorrect trigger level | ✅ Medium | Compare waveform quality at the sensor and at the I/O terminal. Inspect shield and drain-wire termination, cable routing, terminal torque, and the shaft keyphasor target. | Correct noise and target issues. Do not try to mask a bad reference pulse with alarm delays or software averaging. |
| Phase readings shift after replacement | Field wires swapped, wrong channel mapping, changed sensor type, incorrect rack configuration | ✅ High | Photograph wiring before removal. Compare channel assignment and sensor type in Rack Configuration Software with the original installation records. | Restore the original channel mapping and verify phase against a known-good reference before returning the machine to service. |
| Input works only at low speed | Weak magnetic pickup signal, probe-gap issue, wrong input configuration, excessive cable resistance | ✅ Medium | Measure or scope the sensor signal during rundown and run-up. Compare amplitude at low and rated speed with site acceptance criteria. | Adjust or replace the field sensor and inspect cable integrity. The I/O module is not usually the first failure point. |
| Alarm occurs after servicing the rear card | Terminal wiring changed, shield left floating, card inserted in wrong rack position, monitor configuration not restored | ✅ High | Review terminal photos, slot label, configuration backup, and rack event log. Confirm the card is 135473-01 and matches the 3500/25 installation. | Correct wiring and configuration. Do not force the machine back online while the Keyphasor reference remains questionable. |
| Communication or rack-wide alarm occurs | Rack power issue, TDI/communications module problem, front monitor fault | ❌ Low | Review rack status and event logs. Check the TDI, rack supply, and all monitor seating. | The 135473-01 is a rear signal I/O card, not a communications module. Troubleshoot the rack and front monitor before replacing it. |
| Moisture, corrosion, or heat damage is visible | Cabinet ingress, contaminated atmosphere, loose terminal, field transient, improper cable gland | ✅ High | De-energize the rack. Inspect terminals, connector pins, barriers, board surface, and backplane contacts under proper lighting. | Replace damaged hardware and correct the enclosure, terminal, and transient source before installing a replacement. |
❗ Do not mistake this for a vibration monitor or accelerometer. The 135473-01 is a rear Keyphasor I/O module with internal barriers and internal terminations for a 3500/25 system. It handles shaft-reference signal wiring; it does not measure vibration channels or independently generate protection alarms.
❗ Document the original wiring before removal. Take photos of the front 3500/25 monitor label, rear I/O label, field terminals, cable shields, sensor cable, rack slot, and earth connections. One swapped Keyphasor channel can reverse a phase relationship and create confusing machinery diagnostics.
❗ Never use a questionable Keyphasor signal for machine acceptance. A noisy or missing once-per-turn reference can corrupt speed, phase, vector, and tracking measurements across multiple monitors. Validate the waveform during turning gear, run-up, normal operation, and coastdown when the plant procedure permits.
❗ Internal-barrier versions have a tighter operating temperature limit. The associated 3500/25 configuration is listed at 0 to +65 °C for the internal-barrier I/O version, unlike non-internal-barrier arrangements. Check cabinet heat, ventilation, and actual rack temperature before blaming the module.
If the fault remains unresolved, provide technical support with photos of the 135473-01 nameplate, front monitor order code, rack slot, field wiring, sensor type, waveform capture, diagnostic screenshots, and 3500 event logs. Keep these checks in mind and you will save yourself 90% of typical rework time.
Frequently Asked Questions (FAQ)
What is the Bently Nevada 135473-01 used for?
The 135473-01 is a Keyphasor I/O module for a Bently Nevada 3500/25 Enhanced Keyphasor Module. It provides internal barriers and internal terminations for two Keyphasor input channels, allowing the 3500 rack to receive shaft-speed and phase-reference signals from configured proximity-probe or magnetic-pickup sources.
Does the 135473-01 work by itself?
No. It is a rear I/O module and requires a compatible 3500/25 Enhanced Keyphasor front monitor in the corresponding slot. The front monitor processes the input and provides Keyphasor functions within the 3500 Machinery Protection System; the 135473-01 provides the field-signal interface and internal barrier arrangement.
How many Keyphasor channels does it support?
The associated 3500/25 configuration is a two-channel Keyphasor module. Each 135473-01 supports the two corresponding rear I/O signal paths. At the full rack level, the 3500 Machinery Protection System can accept up to four Keyphasor signals in a normal configuration or up to eight signals in a paired configuration.
Is the 135473-01 interchangeable with a standard 3500/25 I/O module?
No, not automatically. The 135473-01 specifically uses internal barriers and internal terminations. Other 3500/25 I/O modules may use external termination assemblies, different isolation arrangements, or alternate certification options. Match the installed rear-module part number and physical field-wiring method exactly.
Can I hot-swap the 135473-01?
Do not assume hot-swapping is permitted. Removing a Keyphasor rear I/O module can create a loss of speed and phase reference, generate NOT OK conditions, and affect protection or diagnostic functions on a running machine. Follow the site’s approved machinery-protection bypass, alarm-management, lockout, and work-permit procedures before removal.
Why does the 3500 system show Keyphasor NOT OK after replacement?
Common causes include incorrect field wiring, swapped channels, poor cable shielding, a loose terminal, wrong I/O module type, incorrect monitor configuration, incorrect probe gap, a failed magnetic pickup, or no usable shaft reference target. Start with the sensor waveform and terminal wiring. The rear I/O module should not be the first suspect when only one channel fails.
Will replacing this module erase the 3500 configuration?
Normally, no. The 3500 system configuration resides in the rack and monitor setup, not in the rear I/O termination module. But a replacement can still create a functional problem if the wiring, sensor assignment, barrier type, or monitor configuration does not match the installed system. Back up the rack configuration and photograph all wiring before the swap.
Is 135473-01 obsolete, and should I keep a spare?
Treat it as a legacy 3500-system spare with supply dependent on OEM availability and surplus inventory. For critical turbines, compressors, generators, and large pumps, hold a verified spare that exactly matches the installed 3500/25 internal-barrier and internal-termination configuration. Store it in ESD-safe packaging and retain the rack configuration, terminal photographs, and loop drawings with the spare.
