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　　3500/50 Other Names

　　Monitoring Module 3500/50

　　3500/50 Tachometer Module Front Card

　　Overspeed Detection Module 3500/50

　　Core Parameters

　　Measurement Performance: Measurement range 0-20,000 RPM, accuracy ±0.01% or ±20 RPM/min (under different operating conditions), output 4-20mA analog signal, supports pulse signal input (eddy current/magnetic sensor).

　　Electrical Characteristics: Operating voltage 24V DC, ambient temperature -20℃ to +70℃, storage temperature -40℃ to +85℃, protection rating IP65, weight approximately 0.5kg.

　　Interface and Compatibility: Supports communication with the 3500 frame backplane, providing key phase signals for use by other monitors (such as vibration modules), and is compatible with TMR (Triple Module Redundancy) systems.

　　Functional Features

　　Monitoring Modes: Configurable to four modes via the 3500 frame configuration software:

　　Speed Monitoring + Setpoint/Speed Alarm

　　Zero Speed Indication (Low Speed Threshold Trigger)

　　Rotor Acceleration Alarm (Detects Rate of Speed Change)

　　Reverse Indication (Direction Monitoring)

　　Dual-Channel Monitoring: Can receive signals from eddy current sensors or magnetoresistive sensors to measure shaft speed, rotor acceleration, and rotation direction, supporting dual-channel redundancy design.

　　Alarms and Protection: Supports two-level alarms (warning/danger), adjustable alarm delay (1-60 seconds), peak hold function records the highest speed/reverse speed, and user-resettable.

　　Expandability: Can integrate relay output modules (such as 3500/33) to achieve equipment linkage control, supports external terminal options to simplify wiring (such as rack/wall mounting).

　　Key Phase Signal Output: Provides key phase signals to the 3500 frame backplane for use by other monitors, eliminating the need for an additional key phase module.

　　Peak Hold Function: Records maximum speed, reversal speed, or number of reversals; user reset supported.

　　Technical Specifications

　　Measurement Range: 0-20,000 RPM (some configurations support higher ranges), accuracy ±0.01% FS, resolution 0.01 RPM, response time <10 ms, compliant with API 670 standard.

　　Input Signal: Supports +10.0V to -24.0V pulse signals; input impedance 20kΩ (standard)/40kΩ (TMR redundancy)/7.15kΩ (internal safety barrier).

　　Power Consumption and Protection: Typical power consumption 5.8W, operating temperature -20℃ to +70℃, storage temperature -40℃ to +85℃, protection rating IP65.

　　Output Interface: 4-20mA analog signal, RS485 digital signal, supports Modbus communication. Application Scenarios

　　Industry Coverage: Widely used in power (steam turbines, generators), petrochemicals (compressors, pumps), metallurgy (fans, coal mills), and aviation (gas turbines) industries.

　　Typical Equipment: Monitors the speed, acceleration, and direction of rotation in steam turbines, compressors, gearboxes, motors, and other rotating machinery, preventing overspeed, reverse rotation, abnormal vibration, and other faults.

　　Special Configurations: Supports triple redundancy (TMR) I/O modules, suitable for high-reliability scenarios; a version with built-in safety barriers is suitable for hazardous areas.

　　System Integration: Works in conjunction with other modules of the 3500 system (such as vibration monitors and displacement monitors) to build a complete mechanical protection system, supporting communication with DCS/PLC via Modbus, Ethernet, and other protocols.

　　Installation and Configuration

　　Hardware Installation: Requires insertion into the 3500 frame (full-size 19-inch or mini 12-inch), sharing a rack with power modules and interface modules. Supports hot-swapping; a grounded wrist strap is required during installation to prevent electrostatic discharge; use an IC removal tool for operation.

　　Software Configuration: Alarm thresholds, monitoring modes, key phase output, and other parameters can be set via the 3500 frame configuration software. Firmware upgrades require replacing the IC with specialized tools and reconfiguring the monitor.

　　Wiring Specifications: External terminal options allow field wiring to the ET block (rack wall), connecting I/O modules via pre-fabricated cables to reduce rack congestion; internal terminals connect directly to sensors, requiring attention to the voltage range (+10V to -24V).

　　Frame Integration: Requires insertion into the 3500 monitoring frame. Four monitoring modes are supported through the 3500 frame configuration software:

　　Speed Monitoring + Speed Alarm

　　Speed Monitoring + Zero Speed Indication

　　Speed Monitoring + Acceleration Alarm

　　Speed Monitoring + Reverse Detection

　　I/O Module Options: Offers internal terminal, external terminal, TMR redundancy, and built-in safety barrier versions, allowing users to select according to wiring requirements.

　　Hot-Swap Support: Modules can be safely replaced while the system is running, improving maintenance efficiency.

　　Typical Configuration Examples

　　Standard Kit: 3500/50-01-00-01 (module) + 133442-01 (I/O module), suitable for general speed monitoring.

　　Redundancy Solution: 3500/50-03-00-00 (TMR redundant module) + 133450-01 (external terminal I/O module), suitable for high reliability scenarios.

　　Dual-Channel Kit: 3500/50 288062-02 + 133442-01, designed specifically for critical equipment such as steam turbines and generators, supporting dual-channel redundant measurement and fast alarm response.

　　3500/25 Phase Detection Module

　　Function: Single-channel input, providing speed and phase reference (TTL square wave/sine wave, 0-5V/0-24V selectable); response frequency range 0.1Hz-20kHz, phase accuracy ±1°; suitable for condition monitoring of high-speed rotating equipment such as turbines and generators.

　　Technical Specifications: Power consumption <5W, operating temperature -20℃ to +70℃, dimensions approximately 130×40×180mm; compatible with 3500 series vibration monitoring systems, supports multiple sensor types (photoelectric/magnetic sensing).

　　3500/50M Dual-Channel Speed Module

　　Functions: Supports speed monitoring + setpoint alarm + speed band alarm/zero speed indication/rotor acceleration alarm; configurable to provide key phase signal; peak hold function; hot-swappable.

　　Technical Specifications: Similar to 3500/50, but with a dual-channel redundant design, supports TMR redundant I/O modules, suitable for high-reliability scenarios (such as hazardous areas).

　　Maintenance and Precautions

　　Daily Maintenance: Regularly check sensor signal quality, verify alarm logic, and clean the module and terminals. Avoid electrostatic discharge damage; ground before operation.

　　Troubleshooting: If the module has no output, check the power supply, signal input range, and firmware version; for false alarm triggering, calibrate the threshold or check the sensor installation.

　　Safety Specifications: Not for standalone overspeed protection or speed control. Analog output is only for data logging/display. In non-redundant design scenarios, it must be used in conjunction with other protection modules.

　　Summary: The Bently Nevada 3500/50 tachometer module, with its high precision, multi-mode monitoring, and flexible configuration capabilities, has become a key device for protecting industrial rotating equipment. Its deep integration with the 3500 system, combined with strict installation and maintenance specifications, ensures reliable operation under harsh conditions, effectively preventing accidents caused by equipment failure and guaranteeing production safety and efficiency.