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3. Key Technical Specifications
| Parameter | Value |
| Number of Inputs | 8 Isolated Channels |
| Input Signal Types | 0-10 V, 0-20 mA, 4-20 mA |
| A/D Resolution | 12-Bit |
| Supply Voltage | 24 V DC (via backplane) |
| Accuracy | +/- 0.1% of Full Scale |
| Input Impedance | 250 Ω (Current) / >100 kΩ (Voltage) |
| Isolation | 500 V DC Channel-to-Bus |
| Operating Temp | -15 °C to +70 °C |
| Status Monitoring | Error LED per channel / Module Status |
| Connection | Removable Terminal Block |
4. Product Introduction & Supply Chain Strategy
The SAM Electronics NG3028G206 is a high-performance analog input module designed for the demanding environments of marine automation. It serves as the primary interface for critical sensors, including pressure transmitters, temperature probes, and tank level indicators. By converting raw analog signals into digital data for the Geamar processor, it ensures accurate monitoring of engine performance and cargo safety.
Maintaining a “New Surplus” supply of the NG3028G206 is a vital component of a resilient spare parts strategy. Analog cards are prone to drift and component failure due to the constant electrical stress of signal processing. Purchasing New Surplus units ensures that you receive a module with zero hours of thermal fatigue. This approach significantly reduces the Total Cost of Ownership (TCO) compared to refurbished units, which often suffer from “phantom alarms” caused by aged, out-of-spec capacitors.
- NG3028G206
5. Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
Power down the relevant I/O rack. Verify that the loop power for your 4-20 mA sensors is also isolated to prevent accidental shorts. Wear an ESD wrist strap. Document the wiring of the removable terminal block and check the physical coding pins on the rack to ensure the NG3028G206 is the correct module type for that slot.
Stage 2: Removal
Loosen the module’s top and bottom retaining screws. Gently unplug the front terminal block without disconnecting the individual wires. Pull the module straight out from the carrier/backplane to avoid bending the interface pins.
Stage 3: Installation (Clone & Seat)
Verify the jumpers on the NG3028G206 are set correctly for each channel’s signal type (Current vs. Voltage). Slide the module into the slot until it is fully seated against the backplane. Tighten the retaining screws and re-attach the wired terminal block.
Stage 4: Power-On & Testing
Restore system power. Monitor the module’s status LEDs. Use the system’s diagnostic software to verify that sensor values are within the expected range. If a channel shows a “wire break” or “underflow” error, check the loop current and terminal seating.
6. Firmware/Software Versions & Upgrade Notes
- Module Versioning: The G206 suffix indicates a specific hardware revision. Ensure this matches your existing documentation to maintain calibration accuracy.
- Compatibility: This module is designed for standard Geamar backplanes. If upgrading from an older “G” revision, check the system software to see if a new GSD/EDD file is required for proper scaling.
- Warning: Never change jumper settings while the module is powered. Incorrect jumper placement (e.g., applying 10V to a channel set for 20mA) can permanently damage the input circuitry.
7. Frequently Asked Questions (FAQ)
Does this module support both active and passive sensors?
Yes, the NG3028G206 can interface with both 2-wire (passive) and 4-wire (active) transmitters, provided the external loop power is wired correctly according to the SAM Electronics wiring diagram.
Why should I choose “New Surplus” over a used module from a ship breaker?
A used module from a decommissioned vessel has been exposed to years of salt air, humidity, and vibration. These environmental factors degrade the precision of analog-to-digital converters. A New Surplus unit provides the factory-spec accuracy required for critical safety monitoring.
Do I need to calibrate the module before use?
The NG3028G206 comes factory-calibrated. However, we recommend performing a loop-check once installed to account for any resistance in the vessel’s field wiring.
What causes the “Error” LED to stay lit on this module?
Usually, an Error LED indicates a signal out of range (short circuit or open loop) on one of the channels. If all channels are disconnected and the LED remains lit, the module may have an internal hardware fault.
Is this part compatible with Wärtsilä NACOS Platinum systems?
Yes, the NG3028G206 is a standard component in many NACOS-era automation racks, but always verify the specific part number in your vessel’s technical manual before ordering.
