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Phone: +86 16626708626Description
Key Technical Specifications
| Parameter | Specification Value |
| Channel Capacity | 2 continuous monitoring channels (single or redundant pair) |
| Input Transducers | Proximity probes, Magnetic Pickups, Optical Pickups |
| Speed Range | 1 to 99,999 RPM (up to 20 kHz pulse input frequency) |
| Supported Functions | Speed Monitoring, Overspeed Detection, Acceleration, Zero Speed, Rotor Acceleration |
| Input Impedance | 20 kΩ minimum (Proximitor), 10 kΩ (Magnetic Pickup) |
| Transducer Power Output | -24 V DC available per channel |
| Power Consumption | 5.8 W typical (Main module + I/O card) |
| Alarm Setpoints | Independent Alert and Danger speed setpoints per channel |
| Accuracy | Within ±1 RPM (1 to 9,999 RPM), ±0.01% of full scale (10,000 to 99,999 RPM) |
| Analog Recorder Outputs | +4 to +20 mA proportional current loop per channel (0 to 600 Ω load) |
| Operating Temperature | −30 °C to +65 °C (−22 °F to +150 °F) |
| Main Module Dimensions | 241.3 mm x 24.4 mm x 241.8 mm (9.50 in x 0.96 in x 9.52 in) |
Product Introduction & Supply Chain Strategy
The Bently Nevada 3500/50-01-00 is a 2-channel tachometer monitor designed to accept inputs from speed sensors to measure rotational speed, rotor acceleration, and zero speed. It compares incoming speed signals against programmed alarm thresholds to trip relays during destructive overspeed events or abnormal machine spin-up/spin-down sequences.
Maintaining this option -01-00 (Internal Termination I/O) module in buffer stock mitigates the severe risks associated with overspeed monitoring hardware failures. Sourcing genuine New Surplus guarantees zero backplane contact wear, uncompromised signal processing ICs, and full OEM reliability to prevent million-dollar turbomachinery catastrophic failures.
- 3500/50-01-00
Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
- Execute lockout/tagout procedures on machine trip circuits connected to the 3500 rack relay modules.
- Put on an anti-static wrist strap securely grounded to the cabinet frame.
- Open 3500 Rack Configuration Software and save a full backup file of the active system settings (
.350file). - Note the DIP switch settings, node addresses, speed sensor type, and event wheel tooth count (K-factor) configured for the slot.
Stage 2: Removal
- Unfasten the top and bottom captive screws on the 3500/50 main tachometer card.
- Pull both ejector handles outward simultaneously to unseat the card from the 3500 backplane.
- Slide the card straight out along the guide rails and place it immediately into an ESD shielding bag.
Stage 3: Installation (Clone & Seat)
- Confirm the replacement 3500/50 module matches the hardware revision and jumper layout of the original unit.
- Align the module circuit board with the top and bottom slot guide channels in the rack.
- Push the card in firmly until it seats into the backplane connector, pivot the ejector handles shut, and tighten the captive retention screws.
Stage 4: Power-On & Testing
- Restore 24 V DC power to the 3500 rack.
- Verify the front-panel OK LED illuminates solid green and the TX/RX LED flashes during backplane polling.
- Inject a calibrated pulse frequency via a signal generator at the front buffered BNC connectors to confirm RPM scaling and overspeed setpoint trip logic prior to clearing software bypasses.
Firmware/Software Versions & Upgrade Notes
- Recommended Firmware: Firmware Revision 2.10 or later (configured via 3500 Rack Configuration Software v4.0 or higher).
- Compatibility Notice: Option -01 designates the 133388-01 Tachometer I/O Module with Internal Terminations. Ensure the channel configuration in software specifically designates the Internal Termination I/O option; selecting an External Termination or Isolated I/O layout will generate a hardware configuration fault code.
- Upgrade/Downgrade Risk Warning: Never update card firmware while the monitored machine is running. Downloading new firmware resets the 3500/50 internal microprocessors, forcing speed outputs to zero and dropping the system OK relay, which can trigger an accidental plant trip if not put into software bypass.
Frequently Asked Questions (FAQ)
What does the “-01-00” option breakdown mean for the 3500/50?
Option -01 specifies the 133388-01 Tachometer I/O Module with Internal Terminations (screw-terminal connectors mounted directly on the rear card). Option -00 indicates standard agency approvals (cNRTLus Class 1, Division 2 / Zone 2).
Is this Bently Nevada 3500/50-01-00 card guaranteed to be unused?
Yes. We exclusively supply Brand New Surplus units in original OEM anti-static packaging. These modules originate from verified surplus stocks, show no backplane pin insertion marks, and undergo complete functional verification before shipment.
Why should I purchase New Surplus instead of cheaper refurbished tachometer cards?
Refurbished speed processing cards often suffer from aged electrolytic capacitors and degraded high-speed optocouplers due to continuous high-temperature panel operation. A failure in an overspeed protection circuit can cause catastrophic rotor burst; spending 20% to 30% more for New Surplus guarantees OEM reliability and peace of mind.
Can the 3500/50 be used as an Electronic Overspeed Shutdown System?
While the 3500/50 provides overspeed alarm generation and relay drive logic, it is designed as a machinery protection monitor. For API 612 compliant dedicated triple-modular redundant overspeed protection, Bently Nevada recommends the dedicated 3500/15 or 3701/55 Overspeed Protection System alongside the 3500/50.
How do I swap a faulty 3500/50 module without stopping the turbine?
Open the 3500 Rack Configuration Software, connect to the rack, and place the 3500/50 slot into Software Bypass. This inhibits the tachometer module from firing system trip relays during physical removal and insertion.
What warranty is provided with this New Surplus tachometer card?
Each New Surplus Bently Nevada 3500/50-01-00 includes a full 1-year replacement warranty, a verified serial number tag, and a comprehensive QC test certificate.
