Description
ALSTOM LC105A-1
Technical Specifications Multi-channel digital input and relay output; Input voltage range 24VDC; Relay contact rating 250VAC / 3A; Backplane bus communication; Powered by turbine rack backplane; Protection class IP20.
Functional Features Acquire field discrete contact status for turbine interlock condition; Relay output for turbine auxiliary actuator and interlock control; Channel open circuit and short circuit diagnosis; Onboard hardware self-test during power-up; Transmit channel state to turbine main controller via backplane bus; LED status indicator for each channel; Surge protection for field wiring terminals.
Application Scenarios Thermal power plant steam turbine control system; Combined cycle gas turbine interlock protection; Power generation turbine auxiliary equipment control cabinet; Industrial heavy-duty turbine safety interlock circuit.
Performance Parameters Operating ambient temperature 0℃ to +60℃; Storage temperature -40℃ to +85℃; Relative humidity 5% to 90%, no condensation; Vibration resistance meets power generation control standard.
Material Composition Flame-retardant plastic module housing; Multi-layer glass fiber PCB; Optocoupler signal isolation components; Electromechanical control relays; Surge suppression TVS diodes; Gold-plated backplane connectors; LED channel status indicators.
Structural Characteristics Single slot rack plug-in module; Back gold finger connects to turbine control backplane; Front terminal block for field switch and actuator wiring; Front panel LED indicators for power, input and output channel status; Internal isolation between field circuit and backplane bus circuit.
Working Principle Field switch contact signals enter module through terminal block. Optocoupler isolates raw signal and converts to standard digital logic level. The module reads input status and transmits data to turbine main controller via backplane bus. When controller sends output command, onboard relay acts to drive field solenoid or interlock device. Built-in diagnostic circuit monitors channel wiring fault continuously.
Installation Requirements Cut off turbine rack power before inserting module. Insert module into empty rack slot and lock buckle. Connect field discrete wiring to terminal block. Configure channel definition in turbine control software, download configuration and test each input and output channel. Ensure cabinet reliable protective earthing.
Usage Notes Do not hot swap module when turbine control system is running. Backup turbine interlock logic before module replacement. Check relay contact aging periodically. Separate field signal cable and high voltage power cable. Do not modify internal circuit components.
