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SPECIFICATIONS:
Part Number: DS3820LIMA
Manufacturer: General Electric
Series: Mark IV
Function: Logic Signal Isolation and Interface
Signal Type: Digital (TTL / 24V DC logic levels)
Input Voltage Range: 5V DC / 24V DC
Output Voltage Range: TTL Compatible / 24V DC
Mounting Type: Rack/DIN Rail Mount
Storage Temperature: -40°C to +85°C
Board Size: 14.75 cm High x 17.5 cm
Weight: 0.5 kg
Repair: 3-7 Days
Weight: 2.00 lbs
Country of Origin: USA
Availability: In Stock
FUNCTIONAL DESCRIPTION:
DS3820LIMA is a Logic Interface Isolation Module manufactured and designed by General Electric as part of the Mark IV Series used in GE Speedtronic turbine control systems. This module serves to electrically isolate and buffer the logic-level signals that flow between the control system and external field devices. By doing so, it enhances system reliability and prevents issues caused by ground loops, electrical noise, or signal transients. The DS3820LIMA ensures that control signals maintain their integrity across different system boundaries, providing clean, isolated logic communication between sensitive electronic circuits and high-energy field environments. Its use of optical isolation or transformer-based barriers allows for safe and effective transmission of digital signals in gas and steam turbine applications.
INSTALLATION:
The DS3820LIMA is typically mounted within the control cabinet alongside other GE Speedtronic modules. It is designed for rack-based or DIN-rail installation, depending on the panel configuration. Field wiring, such as contact closures, digital sensor outputs, or control relays, is connected to the module’s input side, while the isolated output side is wired directly to the control logic processor or I/O card. Power is typically supplied from the control system’s regulated DC supply, often at 5V or 24V, depending on the system’s design. Proper grounding, cable shielding, and polarity checks are critical during installation to prevent damage and ensure reliable operation.
OPERATION:
The module operates continuously during the turbine control system runtime. It receives incoming digital signals from external devices, conditions them if necessary, and transmits clean, isolated versions of those signals to the turbine control logic. The optical or magnetic isolation used within the module effectively blocks any electrical disturbances that may be present in field wiring, ensuring that the controller receives only accurate and noise-free logic signals. This isolation is especially important in high-voltage or industrial environments where signal integrity is often compromised. In some versions, diagnostic LEDs may be provided to indicate signal activity or fault status.
COMPATIBILITY:
It interfaces seamlessly with DS3800 and DS3810 series control boards and I/O modules. The module is capable of processing standard digital input types such as dry contacts, TTL-level signals, and 24VDC logic inputs, making it versatile across a range of field devices. Its mechanical form factor, terminal layout, and electrical characteristics are all engineered to meet the specifications of the Mark IV system, ensuring easy integration and replacement. In retrofit scenarios, the DS3820LIMA can often be used as a direct substitute for legacy isolation modules with minimal configuration changes, preserving the integrity of the overall control architecture.
WOC offers the largest inventory of OEM replacement parts for GE Speedtronic Control Systems. We also provide expert repair services for faulty boards, along with a wide selection of unused and refurbished units, each backed by a warranty. Our dedicated team is available 24/7 to support your automation and OEM requirements. For pricing, availability, or repair inquiries, please reach out to us via phone or email.
What causes signal failure or no response from the module?
Signal failure may result from a damaged isolation circuit, improper input voltage levels, or loose wiring connections. Verify the input signals using a multimeter and ensure correct wiring to the input and output terminals. Check for proper power supply to the module and look for visible signs of board damage or burnt components.
Why is the control system not detecting field inputs connected via DS3820LIMA?
This can occur if the module's input side isn’t receiving correct logic levels or if the optical isolators inside the module have failed. Ensure that the field devices are functioning properly and supplying compatible voltage signals. If LEDs are present on the board, observe whether input activity is being registered.
What type of isolation is used in the DS3820LIMA, and why is it important?
The DS3820LIMA typically uses optical isolation or transformer-based isolation to electrically separate field input signals from the turbine control system’s internal logic. This isolation is critical for preventing ground loops, electrical noise, and transient voltages from damaging sensitive components or causing erratic control behavior.
