Product No.: 3500/40 126615-01 - General Introduction
This product is a Signal Conditioner / Isolator Module designed for the Bently Nevada 3500 Machinery Protection System. The 3500/40 designation refers to the module's function, and the 126615-01 suffix is its specific hardware part number, denoting revisions and configuration details.
The 3500/40 module is a flexible, general-purpose analog interface. Its primary functions are to isolate, condition, and monitor 4-20 mA or voltage signals from various plant transmitters (e.g., pressure, temperature, flow, level) and convert them into a standardized format for the 3500 rack. It provides vital alarm relay outputs based on user-configured setpoints, enabling critical process monitoring and protection alongside vibration data.
Detailed Parameters
| Parameter Category | Specification | Details / Notes |
|---|---|---|
| Module Type | 3500/40 - Analog Signal Isolator/Monitor | A single-slot monitor module for a 3500 series rack. |
| Physical Dimensions (Module) | Height: 318.0 mm (12.52 in) Width: 20.0 mm (0.79 in) - 1 Slot Depth: 193.0 mm (7.60 in) | Standard dimensions for all 3500 monitor modules. Designed for mounting in a 3500/15 or 3500/22 rack. |
| Module Weight | Approx. 0.45 kg (1.0 lb) | Typical weight for an electronic module of this type. |
| Input Channels | One (1) Isolated Channel | Accepts one analog input signal. |
| Input Types | 4 to 20 mA (Active or Passive) Voltage (0-10 VDC, etc.) Potentiometer (for position) | Configurable via software (using the 3500 Rack Configuration Software) and internal jumpers. |
| Input Impedance | For Voltage: > 100 kΩ For Current: ~ 50 Ω (typical for 4-20 mA) | |
| Power Requirement | Powered by the +24 VDC backplane of the 3500 rack. No external power needed. | Typical power consumption: ~ 5 Watts. |
| Isolation | Channel-to-Channel & Channel-to-Ground Isolation | Typically 500 Vrms. Prevents ground loops and protects the rack from field-side transients. |
| Outputs | • 4-20 mA Retransmission (Isolated) • Two (2) Alarm Relay Outputs (Danger, Alert) • OK Relay Output • Digital Data to Rack Interface | Relays are Form C (SPDT), rated typically for 2A @ 30VDC. Alarm setpoints are fully programmable. |
| Display | 5-character, multi-color LED display on the front panel. | Shows channel label, measured value (% or engineering units), and alarm status. |
| Configuration | Via 3500 Rack Configuration Software connected to the rack's 3500/92 Communication Gateway. | All parameters (range, alarms, damping, label) are set digitally. |
| Operating Temperature | 0°C to +65°C (+32°F to +149°F) | Standard industrial operating range. |
| Key Features | • Point-to-Point (P2P) Communication with other 3500 modules. • Built-in Sensor Power Supply (can source loop power for passive 4-20 mA transmitters). • Comprehensive diagnostics. |
Primary Application Scenarios
The 3500/40 is used to integrate vital process parameters into a centralized machinery protection system, providing a unified view of machine health.
Turbine & Compressor Support System Monitoring:
Lube Oil Pressure/Temperature: Monitors critical bearing oil supply pressure and temperature. A low pressure or high temperature signal can trigger an Alert or Danger shutdown to prevent bearing damage.
Seal Gas Differential Pressure: For compressors, monitors the pressure differential across dry gas seals, a critical parameter for safe operation.
Pump Performance & Protection:
Differential Pressure Across Filters: Monitors pump inlet filter condition to warn of clogging.
Discharge Pressure & Bearing Temperature: Provides alarms for high discharge pressure (blocked line) or overheating pump bearings.
General Process Monitoring in Critical Machinery Trains:
Cooling Water Flow/Temperature: Ensures adequate heat exchanger performance for intercoolers and aftercoolers on compressors.
Fuel Gas Pressure: Monitors supply pressure to gas turbine combustors.
Level in Important Sumps or Reservoirs: Monitors level in lube oil or control oil tanks.
Position Monitoring (via Potentiometer):
IGV/Actuator Position: Monitors the feedback signal from Inlet Guide Vane (IGV) actuators or other valve positioners on turbines and compressors to ensure proper control response.
Plant Integration & Redundancy:
Interface with DCS/PLC: The conditioned 4-20 mA output can be sent to a plant Distributed Control System (DCS) while the alarm relays provide hardwired backup protection, creating a 2-out-of-3 voting system for ultra-critical shutdown functions when used with other sensors.
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