Technical Specifications Multi‑channel RTD sensor input channels, back‑plane system bus interface. Support standard PT100 RTD sensor type. Operating temperature ‑20 ℃ to +65 ℃, storage temperature ‑40 ℃ to +85 ℃, relative humidity 5%‑95% non‑condensing. Plug‑in chassis mounting structure.
Functional Features Acquires resistance signal from field RTD temperature sensors. Completes resistance‑to‑temperature conversion calculation. Transmits real‑time temperature value to main protection unit. Supports over‑temperature alarm and trip threshold configuration. Detects RTD sensor open‑circuit and short‑circuit fault condition. Provides temperature data for event record.
Application Scenarios Temperature monitoring spare expansion module for GE 239 series motor protection relays. Used for large motor winding and bearing temperature supervision in power plants, water pump stations and industrial production sites.
Performance Parameters High‑accuracy RTD temperature conversion, fast sensor fault detection response, stable multi‑channel temperature data transmission.
Material Composition Flame‑retardant plastic module housing. Multilayer glass‑fiber epoxy printed circuit board. RTD signal conditioning and conversion circuit, back‑plane bus interface assembly. Chassis plug‑in gold‑plated contact connectors.
Structural Characteristics Standard plug‑in module shape. Rear edge connector mates with main unit chassis back‑plane bus. Front panel provides RTD field wiring screw terminals. Module locking buckle secures module into chassis slot. Front panel equipped with channel status LED indicators.
Working Principle Module obtains working power from chassis back‑plane bus. RTD resistance signals from motor temperature sensors connect to front‑panel terminals. Internal circuit measures resistance value and converts to corresponding temperature value. Temperature data is uploaded through back‑plane bus to main protection relay for thermal monitoring and protection logic processing.
Installation Requirements Wire field RTD sensor cables onto front‑panel screw terminals. Restore chassis power supply, configure sensor type and temperature threshold parameters via setting software, verify real‑time temperature reading.
Usage Notes Only match compatible main protection relay hardware series. RTD field wiring shall adopt shielded cable to reduce interference.
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