Description
Product Core Brief
- Model: 133396‑01
- Brand: BENTLY
- Series: 3500 Machinery Protection System (3500/53)
- Core Function: Provides high‑speed electronic overspeed detection for rotating assets. Accepts pulse inputs from proximity probes or magnetic pickups, executes fast‑acting overspeed trip logic, and supports 2‑out‑of‑2 or 2‑out‑of‑3 voting for safety‑critical turbine and compressor protection.
- Product Type: Electronic Overspeed Detection Module
- Key Specs: 3 independent speed input channels | Full‑height slot | Probe / magnetic pickup compatible | Fast trip response
Note: OEM discontinued; available as new surplus and field‑tested used stock.
Key Technical Specifications
- Input Channels: 3 independent speed‑monitoring input channels
- Supported Sensors: 3300‑series eddy‑current proximity probes, magnetic pickups
- Input Frequency Range: 3.3 Hz to 20 kHz
- Maximum RPM Range: 99999 RPM
- RPM Measurement Accuracy: ±0.1 RPM below 100 RPM; ±1 RPM 100‑10000 RPM; ±0.01 % above 10000 RPM
- Backplane Power Draw: 380 mA @ +24 VDC
- Form Factor: Full‑height slot for 3500‑series rack
- Safety Logic: Configurable 2‑out‑of‑2, 2‑out‑of‑3 voting; overspeed trip, alarm setpoints
- Analog Output: 4‑20 mA per channel for speed value transmission to host systems
- Operating Temperature: ‑30 °C to +65 °C
- Weight: 0.44 kg
- Dimensions: 241 mm × 114 mm × 25 mm
- Humidity: 5‑95 % non‑condensing
- Agency Compliance: CSA‑NRTL/C, designed for API 670 overspeed‑protection applications
BENTLY 133396-01BENTLY 133396-01
Product Introduction
This safety‑focused module delivers dedicated overspeed protection inside the 3500 rack. It processes pulse signals from shaft‑mounted sensors, computes real‑time shaft speed, and executes user‑configured voting logic for overspeed alarms and trips.
It is intended for safety‑critical rotating‑machinery applications. Multiple 3500/53 modules can populate one rack to build fault‑tolerant overspeed protection architectures. Speed data publishes across the backplane to the communications gateway for plant‑system visibility.
QA & Testing SOP
- Incoming Inspection: Match part number and serial number against OEM documentation. Inspect PCB for solder damage, connector wear, and counterfeit marking inconsistencies. Log serial numbers for traceability.
- Live Testing: Seat inside genuine 3500 rack, apply rated backplane power. Establish comms handshake with rack configuration software. Inject variable‑frequency pulse signals to each channel; verify speed readings, alarm activation, and voting‑logic behavior during continuous 24‑hour load test.
- Electrical Testing: Use Fluke 115 and insulation tester. Verify insulation resistance >10 MΩ between signal circuits and chassis ground. Confirm chassis‑to‑rack‑earth continuity.
- Firmware/Config Backup: Record exact firmware revision loaded on the unit. Capture screenshots of overspeed setpoints, voting mode, and sensor‑type assignments before reset. Photograph front‑panel LED indicators for reference records.
- Final QC & Packaging: Place unit inside anti‑static shielding bag. Apply printed QC pass tag with test‑date stamp. Pack with shock‑absorbent foam for transit.
Installation Pitfalls & Guide
❗ Firmware Rev Mismatch: Mismatched rack and module firmware produces incorrect speed readings, missed overspeed events, or broken voting‑logic execution. Confirm firmware compatibility before commissioning safety trips.❗ Slot Location Error: This hardware requires a full‑height rack slot. Partial seating breaks backplane communications and disables safety‑trip capability. Photograph old hardware layout prior to removal.❗ Wiring Incompatibilities: Proximity‑probe and magnetic‑pickup wiring have different termination requirements. Cross‑reference OEM datasheet before landing field cabling; wrong wiring yields zero speed pulses and defeats overspeed protection.❗ Power Draw Changes: Adding this unit increases total rack backplane load. Calculate aggregate slot‑by‑slot current consumption to avoid overloading rack power supplies on safety‑critical racks.❗ ESD Dangers: Unprotected handling can destroy high‑speed pulse‑conditioning safety circuits. Field cases show ESD‑damaged spare units valued over $2000 before power‑on. Always use grounded ESD wrist straps.
4‑step replacement guide1. Pre‑install: De‑energize rack power, don ESD wrist strap, validate firmware compatibility. Lock‑out external trip‑circuit outputs. Document overspeed setpoints, voting configuration, and sensor assignments.2. Removal: Release front‑panel latch, slide out old unit, document all field‑wiring assignments.3. Install: Slide replacement firmly into full‑height slot until latch fully engages. Reconnect field wiring per datasheet pinout.4. Power‑on Test: Restore rack power, confirm backplane communication. Inject simulated shaft‑speed pulses, validate RPM readings, alarm thresholds, and voting‑trip response. Complete full safety‑function proof‑test before returning machine to service.
FAQ
Q: Does this unit support hot‑swap operation?A: No. It draws power directly from the main system backplane. Live removal creates voltage transients that can corrupt adjacent safety‑related modules or damage backplane traces. Full rack power‑down is mandatory.
Q: Can I mix proximity probes and magnetic pickups across its three channels?A: Yes, each channel supports independent sensor‑type configuration. Re‑validate every channel setting after module replacement.
Q: What happens when stored configuration is lost after power‑cycle?A: All overspeed thresholds, voting mode and sensor‑type parameters live in volatile memory. Power loss erases custom safety‑related settings. Reload rack configuration and perform complete overspeed proof‑test after power restoration.
Q: Is brand‑new factory stock available?A: Original OEM manufacturing has ceased. Available stock comes from new‑surplus or field‑tested used inventory. Lead‑times shift with lot availability.
Q: What warranty applies to surplus stock?A: Third‑party inventory carries limited‑time functional warranty covering hardware defects. It excludes damage caused by site‑side over‑voltage events, mis‑wiring, or incorrect safety‑configuration. OEM factory warranty is no longer offered.
Q: Does this module carry stand‑alone SIL certification?A: It supports safety‑voting architectures for overspeed protection, but it does not have standalone SIL certification. The complete safety loop including sensors, wiring, voting logic, and trip devices must undergo full site‑specific safety assessment and periodic proof‑testing. Verify with OEM datasheet.
Q: Can the 3500/50M tachometer module serve as a direct drop‑in replacement?A: Physical form factor matches, but the 3500/50M lacks the fast‑response safety‑oriented overspeed trip and multi‑channel voting capability of the 3500/53. Direct substitution for safety‑critical overspeed protection is not allowed.
