Description
Product Introduction
The Autronica CDA-20 is the main user interface and control display adapter card built specifically for the legacy AutroPower SC-20 switch-mode power supply rack. Mounted right behind the front fascia, this module drives the character LCD screen, reads keypad inputs, and translates operator commands into digital control signals for the internal power conversion modules.
Going beyond a basic display driver, the CDA-20 acts as a local monitoring node. It constantly samples rail voltages, charge currents, battery health, and mains fault alarms from the power rack, displaying live telemetry for field technicians. If the CDA-20 fails, operators lose all local visibility and manual control over the vessel’s primary fire alarm power backup system. Replacing a faulty card with a tested CDA-20 brings the front panel back to life instantly without replacing the whole power rack.
Key Technical Specifications
| Parameter | Specification |
| Manufacturer & Part No. | Autronica CDA-20 (116-CDA-20) |
| System Compatibility | Autronica AutroPower SC-20 Switch Mode Power Supply Systems |
| Primary Function | Operator Interface, LCD Driving, Alarm Status Display |
| Display Support | Multi-character Alphanumeric LCD Panel |
| User Inputs | Front-panel Membrane Keypad Interface (Navigation & Reset keys) |
| Operating Voltage | 24 VDC (Internal system bus powered) |
| Bus Interface | Flat ribbon connector interface to SC-20 main motherboard |
| Onboard Logic | Microcontroller-based telemetry processing and fault logging |
| Enclosure Integration | Panel-mount carrier card assembly behind SC-20 front door |
| Conformal Coating | Marine-grade protective coating against humidity and airborne salt |
Application Scenarios & The “Trench” Experience
The Marine Engineer’s 2 AM Emergency
You are the electrical engineer on a seismic survey vessel operating off northern Norway. During a scheduled weekly emergency generator test, a transient power glitch hits the ship’s safety systems. The main AutroPower SC-20 rack on the bridge stays up on batteries, but the LCD screen on the front panel goes completely scramble-garbled, and the buttons stop responding. The unit shows a solid yellow “System Fault” light, but without a functional display board, you cannot read the diagnostic code or check if the battery bank is actually charging. Class rules prohibit deep-water deployment with a degraded fire panel power supply. Dropping in a spare module restores display telemetry in under 15 minutes, letting you verify normal operations and avoid an expensive port detour.
Key Field Applications
- Maritime Safety Power Racks: Providing local LCD diagnostics and keypad control on bridge-mounted SC-20 fire system power supplies.
- Offshore Rig Safety Systems: Local monitoring of 24VDC charger banks supporting central Fire & Gas (F&G) logic racks.
- Shipyard Retrofit Projects: Restoring display operation on older AutroPower units during scheduled vessel drydocking.
- Industrial Safety Systems: On-site power monitoring across critical manufacturing plants running legacy Autronica fire control networks.
Transparency SOP: Quality Assurance & Testing
Display and control boards demand rigorous testing to ensure clean telemetry and dependable keypad action. We don’t just ship boxes; we test them on actual Autronica test rigs.
- Inbound Visual & Mechanical Audit: Thorough check of tactile keypad header contacts, ribbon connector pins, solder joints, and LCD driver ICs for signs of stress or overheating.
- Backplane Power-On Diagnostic: The card is installed in a live AutroPower SC-20 test chassis to confirm display initialization, clean character contrast, and bus communications.
- Keypad Matrix Response Check: Testing all navigational and enter/reset keys under power to verify reliable button actuation without double-strikes or missing inputs.
- Telemetry & Alarm Validation: Simulating loss-of-mains and battery-low conditions to verify that fault codes accurately render on screen and drive panel status LEDs.
- Anti-Static Sealing & Marine-Grade Packaging: The board is cleared, treated with anti-static protection, vacuum-sealed in a static-shielding bag, and packed in high-density foam for ocean transit.
CDA-20
The Veteran’s Tech Trap Guide (Crucial Value-Add)
⚠️ Isolate System Power Before Unplugging the Ribbon Cable
Never pull the fine-pitch ribbon cable from the back of the while the SC-20 rack is energized. Misaligning the pins by one row during a live hot-swap will short the 5V logic line straight to ground, frying the onboard microcontroller on the display board and corrupting the main rack controller.
❗ Adjust Contrast Potentiometers Before Declaring a “Blank” Screen
If you install a replacement card and the LCD appears completely blank or solidly lit with white blocks, don’t panic! Component tolerances vary across production runs. Locate the tiny blue display contrast potentiometer on the back of the card and tweak it gently with a small jeweler’s screwdriver until the characters pop back into view.
⚠️ Check Flat Cable Plugs for Marine Salt Corrosion
Marine salt air often sneaks inside panel doors. When swapping out a bad board, carefully inspect the mating ribbon cable plug. If you see green oxidation or white crust on the female socket contacts, clean them thoroughly with electrical contact spray before plugging in the replacement card to prevent intermittent comm drops down the road.
Frequently Asked Questions (FAQ for Conversion)
Q: Is the compatible with newer AutroSafe BS-420 or BS-320 fire panels?
A: No. The module is specifically tailored for the legacy AutroPower SC-20 switch-mode power supply family. Newer AutroSafe systems use integrated power supply architectures like the BPS-410 or BPS-310.
Q: Can I replace just the LCD screen without swapping the whole circuit board?
A: Field repairs on the bare LCD glass are rarely successful because the display panel is soldered directly to the carrier board with delicate ribbon leads. Swapping the entire card assembly is the fastest, most reliable way to restore system operation.
Q: Why buy a refurbished or surplus instead of purchasing a new power supply from the factory?
A: The entire AutroPower SC-20 system is a legacy product line. Upgrading to a modern replacement power rack means retrofitting mechanical mounts, rewiring field outputs, and getting class re-approvals—a project costing thousands of dollars. Installing a surplus keeps your existing setup compliant at a fraction of the cost.
Q: How do I know if my issue is the display board or the main SC-20 power motherboard?
A: If the main power supply is outputting a healthy 24VDC to the rest of the fire system but the front display is dead, garbled, or unresponsive to key presses, the fault lies on the board. If the rack output is 0VDC and all panel LEDs are dark, the main power conversion stage is the culprit.
Q: What warranty coverage comes with your surplus or refurbished modules?
A: Every module we ship—whether unused surplus or fully bench-tested refurbished stock—is backed by our full 12-month replacement warranty.
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