Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Series | Mark V (Speedtronic) |
| Full Model | DS3800NFEE |
| Power Supply | +5V DC, ±15V DC (via backplane) |
| Temperature Inputs | 8 differential thermocouple channels (Type J/K/T configurable) |
| Fan Outputs | 8 mechanical relay outputs, 3A continuous @ 115VAC or 30VDC |
| Tachometer Inputs | None (basic version without speed feedback) |
| Communication | Mark V proprietary parallel backplane bus |
| Operating Temperature | 0°C to +60°C |
| LED Indicators | Power (green), Fan Run (8x amber), Over-Temp Alarm (red) |
Advantages and Distinctive Features
-
Mechanical Relay Outputs: The DS3800NFEE uses electromechanical relays rated at 3A continuous, offering lower on-resistance and higher surge current tolerance compared to solid-state designs—ideal for starting fan motors with high inrush currents.
-
Simple and Robust Design: Lacks tachometer feedback circuitry, reducing component count and potential failure points. This makes the DS3800NFEE more reliable in applications where fan speed monitoring is not required.
-
Direct Thermocouple Interface: Onboard ADCs read temperature directly, allowing the DS3800NFEE to trigger fan activation or alarm outputs based on preset thresholds stored in EEPROM.
-
Cost-Effective: Compared to the DS3800NFEC1B1B, the DS3800NFEE is generally more affordable on the refurbished market, making it a practical choice for less critical auxiliary cabinets.
Typical Application Fields
-
Steam Turbine Auxiliary Racks: Where fan speed feedback is not mandatory and simple on/off cooling suffices.
-
Legacy Mark V Installations: Upgrading from older fan relay panels to the DS3800NFEE provides a compact, rack-mounted solution.
-
Gas Turbine Control Rooms: Non-critical cooling zones where the DS3800NFEE manages redundant fans with basic thermal protection.
-
Industrial Cogeneration Plants: Secondary cabinets housing non-safety-related I/O modules.
Comparison with DS3800NFEC1B1B
| Feature | DS3800NFEE | DS3800NFEC1B1B |
|---|---|---|
| Output Type | Mechanical relays (3A) | Solid-state relays (2A) |
| Tachometer Input | None | 2 redundant channels per fan group |
| PID Speed Control | No (on/off only) | Yes (onboard PID) |
| Fault Logging | Basic (no event memory) | 100 events stored onboard |
| EMI Immunity | Standard opto-isolation | Enhanced ferrite + 2500V isolation |
| Operating Temp Range | 0°C to +60°C | -20°C to +65°C |
| Cost (Used) | Lower | Higher |
Selection Recommendations
-
Choose the DS3800NFEE if: Your application requires simple on/off fan control, high inrush current capability (e.g., large AC fans), and tachometer feedback is not essential for safety or diagnostics.
-
Choose the DS3800NFEC1B1B if: You need variable speed control, redundant speed monitoring, advanced fault logging, or extended temperature operation.
Critical Precautions
-
ESD Protection: The DS3800NFEE contains CMOS components on its ADC and logic circuits. Always wear a grounded wrist strap when handling.
-
Relay Contact Wear: Mechanical relays on the DS3800NFEE have a limited lifecycle (approx. 100,000 operations at rated load). For high-cycle applications, consider the solid-state alternative.
-
Thermocouple Polarity: Incorrect wiring will produce negative temperature readings, preventing the DS3800NFEE from activating fans when needed. Use only thermocouple-grade extension wire.
-
Slot Assignment: Install the DS3800NFEE only in auxiliary I/O slots (typically slots 8–10) per your Mark V rack configuration. Improper slot placement can damage the backplane.
-
No Hot-Swap: Always depower the rack before inserting or removing the DS3800NFEE to avoid arcing and connector damage.
.
OMRON C200HW-PD024
A-B “1762-IQ16 ”
A-B 1762-IQ16
Reviews
There are no reviews yet.