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Phone: +86 16626708626Description
Key Technical Specifications
| Parameter | Value |
| Supply Voltage | 24 V DC (-25% / +30%) |
| Input Signal | Magnetic pickup (MPU), Proximity switch, or Tachogenerator |
| Input Frequency | Configurable (Up to 10 kHz depending on version) |
| Analog Output | 0/4–20 mA or 0–10 V DC |
| Switching Outputs | 2 Potential-free relay contacts (e.g., Overspeed/Underspeed) |
| Accuracy | < 0.5% of full scale |
| Mounting | 35 mm DIN Rail (Standard) |
| Protection Class | IP20 (Housing) |
| Certifications | DNV, GL, LR (Marine Type Approved) |
Product Introduction & Supply Chain Strategy
The Noris SG2000 is a versatile speed evaluation unit designed to bridge the gap between field speed sensors and centralized control systems. It functions as a precision signal converter, taking raw frequency pulses from magnetic pickups or proximity switches and transforming them into a stabilized analog signal (4–20 mA). Beyond conversion, it acts as a safety watchdog, providing integrated relay outputs for critical functions like overspeed protection or engine crank termination.
Strategically, the SG2000 is a “high-consequence” component. As an obsolete part within the Norimos 2000 ecosystem, a failure of this unit can render an entire propulsion or generator control string inoperable. Sourcing “New Surplus” units is the only reliable way to maintain system integrity without a full-scale control system refit. Unlike refurbished units, which often suffer from drifted setpoints due to aged internal capacitors, our New Surplus inventory provides the original OEM accuracy and reliability required for marine safety certifications.
Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
- Isolate Power: Turn off the 24 V DC supply to the control cabinet.
- ESD Protection: Use a grounded wrist strap to prevent static damage to the internal logic.
- Record Setpoints: Note the positions of the potentiometers or DIP switches on the side of the unit. These control the frequency scaling and alarm trip points.
Stage 2: Removal
- Unplug the terminal blocks.
- Use a screwdriver to release the DIN rail tension clip and pull the unit away from the rail.
Stage 3: Installation (Clone & Seat)
- Mount the new SG2000 onto the rail.
- Replicate the potentiometer settings (frequency range and relay thresholds) from the old unit to the new one.
- Firmly reattach the terminal blocks.
Stage 4: Power-On & Testing
- Re-energize the unit. Verify the “Power” LED is lit.
- Use a frequency simulator or run the machinery at a low RPM to verify the analog output (4–20 mA) scales correctly.
- Test the relay trip points to ensure the overspeed safety circuit activates at the intended frequency.
- SG2000
- SG2000
Firmware/Software Versions & Upgrade Notes
- Hardware-Based Logic: The SG2000 is primarily a hardware-driven unit. Scaling is performed via onboard potentiometers or internal jumpers rather than firmware uploads.
- Compatibility: This unit is a direct replacement for all SG2000 variants used in Norimos 2000 and earlier Noristar systems.
- Calibration Note: Because this is an analog device, we recommend a fine-calibration check using a calibrated frequency generator after installation to ensure the 20 mA point exactly matches the maximum rated RPM of the engine.
Frequently Asked Questions (FAQ)
Can the SG2000 handle signals from both NPN and PNP sensors?
Yes, the input stage is typically configurable to accept various pulse types, including magnetic-inductive pickups and 3-wire proximity sensors. Check your specific wiring diagram for the correct terminal assignments.
What happens if the “Signal” LED is not blinking?
The Signal LED indicates pulse detection. If it is off while the engine is turning, check the air gap of your speed sensor or inspect the wiring for a break.
Why shouldn’t I just buy a used SG2000?
The SG2000 is often installed in engine room cabinets where it is exposed to ambient heat. Over time, internal components like electrolytic capacitors and relays degrade. A used part may fail shortly after installation, whereas a New Surplus unit offers the full 10–15 year lifecycle.
Is it possible to adjust the relay delay?
Yes, most SG2000 units feature an adjustable time delay (0–10 seconds) to prevent nuisance tripping caused by momentary speed fluctuations or engine startup transients.
How do I convert the frequency input to a 4–20 mA output?
This is handled internally by the unit. You simply select the frequency range that matches your engine’s “teeth-per-second” at max RPM, and the SG2000 automatically scales the current output.
