Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Series | Mark V (Speedtronic) |
| Full Model | DS3800NPSC |
| Power Supply | +5V DC @ 5.0A, +15V DC @ 1.0A, -15V DC @ 0.8A |
| Temperature Inputs | 8 thermocouple channels (12-bit ADC, ±2°C accuracy) |
| Relay Outputs | 8 mechanical relays, 5A continuous @ 115VAC/30VDC (surge 10A) |
| SS Outputs | 4 solid-state relays, 3A continuous @ 24–48VDC |
| Tachometer Inputs | 2 channels (up to 10 kHz) |
| Communication | Mark V proprietary parallel backplane bus |
| Operating Temperature | 0°C to +60°C |
| LED Indicators | Power, Relay Run (8x amber), SS Run (4x green), Tach Fail (red x2), Over-Temp Alarm, Backplane Active |
Advantages and Distinctive Features
-
Relay-Primary Hybrid + Tachometer Feedback: 8 high-current mechanical relays (5A) + 4 solid-state DC outputs (3A) + 2 tachometer inputs on a single board.
-
Full 8 Thermocouple Inputs: Comprehensive temperature monitoring.
-
Higher Relay Current (5A): Supports larger AC/DC fans compared to 3A relay boards.
-
Higher Solid-State Current (3A): Supports larger DC auxiliary loads compared to 2A boards.
-
Fan Speed Verification: Tachometer inputs allow CPU to confirm fan operation.
-
Complete Galvanic Isolation: 2500V isolation on relay outputs.
-
CPU-Dependent Operation: No onboard logic—simple and cost-effective.
Typical Application Fields
-
Safety-Critical Mixed Fan Systems: Where high-power fan control, comprehensive temperature monitoring, and fan failure detection are mandatory.
-
Mixed Fan Cabinets: Where high-power AC/DC fans and DC auxiliary devices coexist with 8 thermocouple sensors.
-
Climate-Controlled Indoor Installations: 0°C to +60°C range.
Comparison with Related Models
| Feature | DS3800NPSC | DS3800NPSB | DS3800NPCR | DS3800NMFA |
|---|---|---|---|---|
| Relay Outputs | 8 × 5A | 8 × 5A | 8 × 5A | 8 × 3A |
| SS Outputs | 4 × 3A | 4 × 3A | 4 × 3A | 4 × 2A |
| T/C Inputs | 8 | 4 | 8 | 8 |
| RTD Inputs | None | None | 8 | None |
| Tach Inputs | 2 channels | 2 channels | 2 channels | 2 channels |
| ADC | 12-bit (±2°C) | 12-bit (±2°C) | 12-bit (±2°C) | 12-bit (±2°C) |
| Operating Temp | 0°C to +60°C | 0°C to +60°C | 0°C to +60°C | 0°C to +60°C |
| Cost | High | High | Very High | Medium |
Selection Recommendations
-
Choose the DS3800NPSC if:
-
You need 8 high-current mechanical relay outputs (5A) for main fans.
-
You also need 4 solid-state outputs (3A) for DC auxiliary devices.
-
You require tachometer feedback for fan speed verification.
-
Your cabinet uses 8 thermocouple sensors for temperature monitoring.
-
You do not require RTD inputs.
-
You have a climate-controlled environment (0°C to +60°C).
-
-
Choose the DS3800NPCR if: You need RTD inputs with the same outputs.
-
Choose the DS3800NPSB if: You need only 4 thermocouple inputs with the same outputs.
Critical Precautions
-
ESD Protection: Always wear a grounded wrist strap.
-
High-Voltage/Current Hazard (Relay): Relay outputs switch 115VAC/5A—lethal. Use proper insulation.
-
Relay Inductive Derating: For inductive fan motors, derate from 5A to 3.5A or use RC snubbers.
-
DC Polarity (SS): Solid-state outputs are DC-only and polarity-sensitive—reverse polarity destroys the MOSFET.
-
SS Voltage Limit: Do not exceed 48VDC—AC voltages cause catastrophic failure.
-
Tachometer Wiring: Use shielded twisted-pair cable. Connect shield to designated terminal—not at the fan end.
-
No Hot-Swap: Always depower the rack before insertion/removal.
-
Slot Assignment: Install in slots 8–10 (auxiliary I/O).
-
CPU Dependency: If backplane communication is lost, the board defaults to 100% fan speed—tachometer monitoring disabled in fallback mode.
-
Firmware Compatibility: The DS3800NPSC is compatible with all Mark V CPU firmware versions (v3.x and above). No specific CPU upgrade is needed.
A-B 25-RF014-AL
SIEMENS 6GK1900-0AB00
A-B 1746-OV16
Reviews
There are no reviews yet.