Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Series | Mark V (Speedtronic) |
| Full Model | DS3800NLCA |
| Power Supply | +5V DC @ 3.2A, +15V DC @ 0.5A, -15V DC @ 0.3A |
| Temperature Inputs | 4 thermocouple channels (12-bit ADC, ±2°C accuracy) |
| Fan Outputs | 8 mechanical relays, 3A continuous @ 115VAC/30VDC (surge 5A) |
| 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, Fan Run (8x amber), Tach Fail (red x2), Over-Temp Alarm, Backplane Active |
Advantages and Distinctive Features
-
Tachometer Feedback: Dual tachometer inputs allow the CPU to confirm fan operation—critical for safety-critical cooling systems.
-
AC/DC Output Capability: Switches both AC (115VAC) and DC (30VDC) loads—versatile for mixed cabinet installations.
-
Fan-Dense Design: 8 outputs with only 4 temperature inputs—optimized for single-zone cooling with speed verification.
-
Mechanical Relay Isolation: 2500V galvanic isolation between control logic and fan power.
-
High Surge Handling: 5A surge capacity for fan startup currents.
-
CPU-Dependent Operation: No onboard logic—simple and cost-effective.
Typical Application Fields
-
Safety-Critical AC/DC Cooling Systems: Where fan failure must be detected immediately.
-
Fan-Dense Cabinets: Where 8 fans serve a single zone with 4 sensors.
-
Mixed AC/DC Fan Installations: Where both AC and DC fans are present.
-
Climate-Controlled Indoor Installations: 0°C to +60°C range.
Comparison with Related Models
| Feature | DS3800NLCA | DS3800NLBA | DS3800NITA | DS3800NFLA |
|---|---|---|---|---|
| Output Type | Mechanical relay | Mechanical relay | Solid-state | Mechanical relay |
| Output Current | 3A | 3A | 2A | 3A |
| T/C Inputs | 4 | 4 | 4 | 8 |
| Tach Inputs | 2 channels | None | 2 channels | 2 channels |
| AC Capability | Yes | Yes | No | Yes |
| 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 | Low | Medium | Medium |
Selection Recommendations
-
Choose the DS3800NLCA if:
-
You need 3A mechanical relay outputs (AC or DC).
-
Your cabinet uses 4 temperature sensors for 8 fan outputs.
-
You require tachometer feedback for fan speed verification.
-
You have a climate-controlled environment (0°C to +60°C).
-
The Mark V CPU handles all control logic.
-
-
Choose the DS3800NLBA if: You need the same design but do not require tachometer feedback.
-
Choose the DS3800NITA if: You prefer solid-state DC outputs with tachometer feedback.
-
Choose the DS3800NFLA if: You need 8 thermocouple inputs with relay outputs and tachometer feedback.
Critical Precautions
-
ESD Protection: Always wear a grounded wrist strap.
-
Relay Contact Wear: Rated for 100,000 operations at 3A.
-
Inductive Load Derating: For inductive fan motors, derate to 2A or use external RC snubbers.
-
Missing T/C Channels: Only 4 thermocouple inputs (channels 1–4). Channels 5–8 are physically absent.
-
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 1786-TPS
MITSUBISHI Q61P
GE IC200ACC003
Reviews
There are no reviews yet.