Product Overview

• PN: 125720-01
• Brand: Bently Nevada (Baker Hughes)
• Series: 3500 Turbomachinery Protection TSI System
• Type: 3500/32M Four-Channel Relay I/O Front Module

• Function: Standard relay output module installed on any slot behind the 3500/22M communication card. It receives Alert, Danger, rack fault and channel abnormal status signals from all monitoring modules on the rack. Four groups of independent relay contacts can be configured with AND/OR voting logic to trigger on-site audible and visual alarms, or send hardwired trip commands to external safety interlock and distributed control systems, realizing physical signal isolation between the monitoring rack and external control loop.

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Core Features

• Four fully isolated programmable relay channels, each channel supports custom alarm trigger logic
• Compatible with single-point alarm, multi-point voting interlock, rack system fault and module offline signal output
• Front panel LED indicators display channel relay pull-in status and module operating health
• Support hot swapping under dual redundant rack power supply without overall power cut during maintenance replacement
• PCB conformal coating treatment, anti-moisture, anti-dust and anti-electromagnetic interference inside industrial control cabinets
• Directly plugs into 3500/05 rack backplane for bus communication, no extra wiring for signal acquisition

• Original version has been phased out by manufacturer, upgraded replacement model is 125720-02

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Technical Specifications

• Power Input: 12~36VDC wide range DC power supply
• Relay Contact Capacity: Max 250VA, rated 10A
• Operating Temperature: -40℃ ~ +85℃
• Storage Temperature: -40℃ ~ +85℃
• Overall Dimension: Standard 3500 series single-slot module size
• Net Weight: Approx 0.38kg
• HS Code: 8538900000
• Certifications: CE, UL

• Product Status: OEM discontinued production; brand new original sealed and fully tested refurbished modules available in stock

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Compatibility

• Applicable Chassis: All 3500/05 12-slot and 14-slot standard rack frames
• Mandatory Preceding Module: Must be used after 3500/22M TDI communication module
• Matching Rear I/O Board: Corresponding dedicated rear terminal wiring board for relay signal outward transmission
• Compatible Software: Official 3500 rack configuration tool, Bently Nevada System 1 diagnostic platform

• Incompatible Restriction: Cannot be mounted in the first two slots occupied by power supply and communication card

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Application

• On-site alarm signal distribution and safety trip interlock for steam turbine, gas turbine and compressor 3500 monitoring cabinets in power and petrochemical industries
• Centralized output of multi-channel vibration, displacement, temperature and process parameter abnormal alarms
• Rack overall fault status feedback to factory central control room for equipment remote monitoring
• Spare replacement and interlock logic expansion upgrade for legacy 3500 series TSI protection racks