Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Series | Mark V (Speedtronic) |
| Full Model | DS3800NMFA |
| Power Supply | +5V DC @ 3.8A, +15V DC @ 0.7A, -15V DC @ 0.5A |
| Temperature Inputs | 8 thermocouple channels (12-bit ADC, ±2°C accuracy) |
| Relay Outputs | 8 mechanical relays, 3A continuous @ 115VAC/30VDC (surge 5A) |
| SS Outputs | 4 solid-state relays, 2A 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
-
Hybrid Output + Tachometer Feedback: Combines 8 mechanical relays, 4 solid-state outputs, AND 2 tachometer inputs on a single board.
-
Full 8 Thermocouple Inputs: Comprehensive temperature monitoring.
-
AC/DC Relay Capability: Relay outputs switch both AC (115VAC) and DC (30VDC) loads.
-
Solid-State Auxiliary Outputs: Silent, maintenance-free switching for low-voltage fans or alarms.
-
Fan Speed Verification: Tachometer inputs allow the 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 fan failure detection is mandatory.
-
Mixed Fan Cabinets: Where both AC/DC fans and DC auxiliary fans are present.
-
Climate-Controlled Indoor Installations: 0°C to +60°C range.
-
Retrofit Applications: Replacing separate relay, solid-state, and tachometer boards.
Comparison with Related Models
| Feature | DS3800NMFA | DS3800NMEA | DS3800NLCA | DS3800NITA |
|---|---|---|---|---|
| Relay Outputs | 8 × 3A | 8 × 3A | 8 × 3A | None |
| SS Outputs | 4 × 2A | 4 × 2A | None | 8 × 2A |
| T/C Inputs | 8 | 8 | 4 | 4 |
| Tach Inputs | 2 channels | None | 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 | Medium | Medium | Medium | Medium |
Selection Recommendations
-
Choose the DS3800NMFA if:
-
You need 3A relay outputs (AC or DC) for main fans.
-
You also need solid-state outputs (24–48VDC) for auxiliary fans or alarms.
-
You require tachometer feedback for fan speed verification.
-
Your cabinet uses 8 temperature sensors for comprehensive monitoring.
-
You have a climate-controlled environment (0°C to +60°C).
-
-
Choose the DS3800NMEA if: You need the same hybrid outputs without tachometer feedback.
-
Choose the DS3800NLCA if: You need relay outputs with tachometer feedback but only require 4 thermocouple inputs.
Critical Precautions
-
ESD Protection: Always wear a grounded wrist strap.
-
High-Voltage/Current Hazard: Relay outputs switch 115VAC/3A—lethal. Use proper insulation.
-
Relay Inductive Derating: For inductive fan motors, derate from 3A to 2A or use RC snubbers.
-
DC Polarity (SS): Solid-state outputs are DC-only and polarity-sensitive—reverse polarity destroys the MOSFET.
-
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: Compatible with all Mark V CPU firmware versions (v3.x and above).
A-B 1734-OB8
PROSOFT 1454-9F
A-B 700-CF310EJ 100S-FA13
Reviews
There are no reviews yet.