3500/32M 125720-02 Spare 4-Channel Output Module

3500/32M 125720-02 Standby 4-channel output module core analysis
I. Product Positioning and Functions
125720-02 is a backup 4-channel relay output module in the Bently Nevada 3500 monitoring system. It belongs to the 3500/32M series and is specifically designed for the industrial automation field. Its core functions include:
Multi-channel control: Provides 4 independent relay output channels, supporting the simultaneous control of multiple electrical appliances and equipment.
Flexible deployment: Can be placed in any slot on the right side of the transient data interface module (TDI), supporting the overlay use of multiple modules to meet complex monitoring requirements.
Alarm driving logic: Each channel has built-in alarm driving logic, supporting AND/OR logic programming, capable of receiving alarm inputs (such as alarms, dangerous states, uncertain states) or combined signals from any monitoring channel in the rack, achieving customized alarm triggering.
High reliability: Relay contacts have a lifespan of 100,000 times (5A, 24Vdc or 120Vdc), ensuring long-term stable operation.

Technical Specifications and Features
Electrical Parameters
Input Voltage Range: 12 – 48VDC
Output Voltage: 5VDC
Output Current: Maximum 10A
Power Consumption: Generally 6W
Arc Suppression Condition: 250Vrms (standard installation)
Physical Parameters
Size: 170mm × 105mm × 32mm
Weight: 0.7 kilograms
Shell Material: Epoxy resin sealed, suitable for harsh industrial environments
Relay Type
Two single-pole double-throw (SPDT) relays, which can be combined into a double-pole double-throw (DPDT) form to meet different control requirements.
Indicator Lights and Status
OK LED: The module flashes when it is working normally.
TX/RX LED: The module flashes when it communicates normally with other modules in the frame.
CH ALARM LED: The channel flashes when it is in an alarm state.
Environmental Adaptability
Operating Temperature: -20°C to +50°C or -30°C to +65°C
Storage Temperature: -40°C to +70°C or -40°C to +85°C
Humidity: 5% to 95% relative humidity (no condensation)

Typical application scenarios
Electric power industry
Used for alarm and protection control of equipment such as steam turbines and generators, such as emergency shutdown signals for faults like excessive axial displacement and vibration exceeding limits.
Petrochemical industry
In key equipment such as compressors and expanders, achieve联动 control of alarms like low lubricating oil pressure and high bearing temperature.
Steel and metallurgy
Used for axial clearance monitoring of equipment such as blast furnace fans and rolling mills， triggering power cut-off or activation of backup equipment when an alarm is triggered.
General machinery
Applicable to fault protection of rotating machinery such as pumps and motors， such as alarm signals for high bearing temperature and abnormal rotation speed.

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