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Phone: +86 16626708626Description
Key Technical Specifications
- Channels: 2 independent Keyphasor channels per module
- Input Signal Range (non‑isolated I/O): +0.8 V to −21.0 V
- Input Signal Range (isolated I/O): +5 V to −11 V
- Speed/Frequency Input Range: 1 to 1,200,000 cpm (0.017 to 20 kHz)
- Output Frequency Range: 1 to 99,999 cpm (0.017 to 1,667 Hz)
- Accuracy: ±1% up to 20 kHz at +25°C
- Transducer Power Supply: −24 Vdc, 40 mA max per channel
- Buffered Outputs: 2 coaxial (front) + 2 Euro‑style (rear) buffered Keyphasor outputs
- Maximum Buffered Output Impedance: 504 Ω
- Power Consumption: 3.2 W typical
- Operating Temperature: −30°C to +65°C (varies with I/O module type; barrier versions 0°C to +65°C)
- Storage Temperature: −40°C to +85°C
- Humidity: Up to 95% non‑condensing
- Dimensions (H × W × D): 119.9 mm × 24.4 mm × 256.5 mm (4.72 × 0.96 × 10.10 in)
- Mounting: Half‑height slot in 3500 rack; supports up to 4 Keyphasor signals per rack in standard config (8 in paired)
Product Introduction
The Bently Nevada 3500/25 is an Enhanced Keyphasor Module for the 3500 Machinery Protection System. It takes raw proximity probe or magnetic pickup tach signals and conditions them into precise digital Keyphasor pulses used for speed, phase, and order‑tracking measurements across the rack.
Field teams choose the 3500/25 for its clean thresholding, dual‑channel density in a half‑height slot, and buffered outputs that feed both monitors and external diagnostic gear without loading the transducer circuit. It’s a direct replacement for existing 3500/25 cards when you need to restore phase reference for orbit plots, startup/coast‑down analysis, and vector vibration diagnostics.
3500/25
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No Keyphasor LEDs / no buffered output | Rack power or backplane issue | ❌ Low | Measure rack supply at the 3500 power module; verify adjacent modules power up | Fix rack power/backplane before swapping the 3500/25 |
| ERR/FAULT LED on 3500/25 | Module self‑test fail or bad I/O config | ✅ High | Read 3500 System 1 status in System 1 or 3500 config software; check module fault codes | Replace 3500/25 if fault persists after power cycle and config verify |
| Keyphasor missing on one channel only | Transducer wiring, gap, or sensor failure | ❌ Low | Check transducer supply (−24 Vdc) and signal at terminals with oscilloscope; verify gap/voltage | Repair/replace probe or wiring; 3500/25 often fine |
| Erratic phase readings, jittery 1X | Threshold set incorrectly or noisy input | ⚠️ Medium | Observe input waveform; compare auto vs manual threshold behavior in config | Adjust threshold; add shielding/grounding per manual |
| No phase on any channel, but rack OK | 3500/25 not seated or backplane contact issue | ⚠️ Medium | Power down, reseat module; inspect backplane pins for damage | If still dead on both channels, swap with known‑good 3500/25 |
| Buffered outputs dead, but rack sees Keyphasor | Front coax or rear Euro connector fault | ⚠️ Medium | Measure buffered output with scope while shaft rotates; check connector continuity | Repair/replace connector harness; module may still be good |
If you’re stuck, send photos of the rack layout, module LEDs, and a screenshot of the diagnostic buffer. We’ll walk through a targeted check before you pull the card.
Frequently Asked Questions (FAQ)
Q: Is the 3500/25 hot‑swappable in a live 3500 rack?
A: No. The 3500 system is not designed for hot‑swap of I/O modules like the 3500/25. Pulling or inserting under power can cause backplane arcing and corrupt rack configuration. Kill the rack power, wait for capacitors to discharge, then swap.
Q: What’s the difference between 3500/25‑01‑01‑00 and 3500/25‑01‑01‑02?
A: The base “3500/25” is the module type; the suffix defines I/O module type, terminations, and agency options. For example, “‑01‑01‑00” = single half‑height 2‑channel card with internal terminations and no special agency option; “‑01‑01‑02” changes the agency/approval option. Functionally they’re both 2‑channel Enhanced Keyphasor cards; verify the exact suffix against your existing rack BOM before ordering.
Q: Will this work as a direct replacement for my failed 3500/25?
A: Yes, if your existing card is a 3500/25 Enhanced Keyphasor Module. Match the suffix (e.g., 3500/25‑01‑01‑00 vs 3500/25‑01‑03‑00) to ensure the same I/O module type (internal terminations vs internal barrier, etc.). Mismatched I/O types can change wiring and termination behavior.
Q: How many Keyphasor channels can I run in one 3500 rack?
A: A standard 3500 rack supports up to four Keyphasor signals. In a paired configuration, the system can accept up to eight. Each 3500/25 module provides two channels, so two modules cover the full four‑channel standard config.
Q: What condition are these units in, and why is the price lower than factory?
A: We sell New Original / New Surplus units: factory‑spec hardware that may be from canceled projects, overstock, or verified surplus. They’re inspected and functionally tested, but not sold as “factory sealed with active OEM warranty.” That’s why pricing is below current OEM list while still being genuine Bently Nevada hardware.
Q: Do I need to reprogram the 3500/25 when I swap it?
A: The 3500/25 itself doesn’t hold user logic; configuration lives in the 3500 rack’s system configuration (System 1 / 3500 config software). After installing the replacement, verify the Keyphasor channel settings (threshold mode, scaling, etc.) match the original. If you’re unsure, export the existing rack config before the swap.
Q: What warranty do you provide?
A: 1‑year warranty against functional failure from date of shipment. If the module fails under normal use within that period, we replace or refund. We also provide a test summary on request for traceability.
