Description
Product Core Brief
- Model: 3500/53 (Part: 133388-01)
- Brand: Bently Nevada
- Series: 3500 Machinery Protection System
- Core Function: Provides highly reliable, fast-response redundant tachometer system specifically for overspeed protection.
- Product Type: Electronic Overspeed Detection Module
- Key Specs: 2oo3 Voting Logic | API 670/612 Compliant | Redundant Power Required
- Condition: New Original (New Surplus)
BENTLY 3500/53 133388-01
Product Introduction
BENTLY 3500/53 133388-01 is an electronic overspeed detection module designed for the Bently Nevada 3500 Machinery Protection System. It provides a highly reliable, fast-response, redundant tachometer system intended specifically for use as part of a critical overspeed protection system.
The 133388-01 is designed to meet the stringent requirements of American Petroleum Institute (API) Standards 670 and 612 pertaining to overspeed protection. This module receives speed pulse input signals from proximity or magnetic sensors and drives alarm relays to protect the machinery. For maximum safety, 3500/53 modules can be combined to build a 2-out-of-2 or a 3-out-of-2 (recommended) voting system.
Key Technical Specifications
- Module Type: Electronic Overspeed Detection Monitor
- Form Factor: Full-Height
- Input Sensors: Eddy Current Proximity Probes (e.g., 3300 XL, 7200 series) or Magnetic Pickups
- Input Signal Range: +10.0 V to -24.0 V (Signals outside this range are internally limited)
- Outputs: Four fast-response alarm relay outputs per module
- Voting Logic: 2-out-of-2 or 3-out-of-2 (TMR)
- Power Requirement: Requires a 3500 rack with redundant power supplies
- Software Requirements: 3500 Rack Configuration Software
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: Trace source via serial number. Inspect front panel connectors and rear Euro-connector for physical damage.
- Visual Inspection: Verify module seating alignment and check for any PCB corrosion or flux residue.
- Live Functional Test: Install in rack. Verify communication with RIM/TDI and confirm “OK” LED illuminates.
- Signal Path Test: Inject simulated tachometer pulse signal. Verify accurate RPM calculation and alarm relay triggering in software.
- Final QC & Packaging: Seal in anti-static bag. Apply QC Passed label with date.
BENTLY 3500/53 133388-01
Replacement Pitfall Guide
❗ Redundant Power Mandatory: The overspeed detection system requires the use of a 3500 rack equipped with redundant power supplies. A single power supply failure must not compromise overspeed protection.
❗ Factory Unconfigured: When shipped from the factory, the 3500/53 module is unconfigured. It must be installed into a 3500 framework and configured using the 3500 Rack Configuration Software to achieve the required monitoring and voting functions.
❗ Slot Placement Rules: The 3500/53 modules can be installed in any slot to the right of the Rack Interface Module (slots 2-15). However, if configuring a three-module group (3-out-of-2 voting), the three modules must be installed in adjacent slots. Only one overspeed protection group is allowed per 3500 frame.
❗ Sensor Compatibility: This module accepts inputs from Bently Nevada eddy current proximity probes (3300 XL, 7200, 3300 RAM) or magnetic sensors. Ensure the selected sensor type matches the module’s input configuration.
❗ Fast Response Relays: Each module provides four fast-response alarm relay outputs specifically designed for machinery protection. Ensure these are wired to your Emergency Trip System (ETS) or DCS according to your plant’s safety logic.
Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
- 3500/53 133388-01 → 3500/50 : Alternative — Use 3500/50 for standard speed/acceleration monitoring (non-API overspeed protection)
- 3500/53 133388-01 → 3500/22M : Complementary — Requires TDI module for rack communication
- 3500/53 133388-01 → 3300 XL / 7200 Probes : Compatible — Standard eddy current and magnetic speed sensors
Benchmarks:
- Alarm Response Time: Fast-response relay output (< 50 ms typical)
- Input Signal Clipping: Signals outside +10.0 V to -24.0 V range are internally limited
