Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Series | Mark V (Speedtronic) |
| Full Model | DS3800NGRC |
| Power Supply | +5V DC @ 3.2A, +15V DC @ 0.5A, -15V DC @ 0.3A |
| Temperature Inputs | 8 differential thermocouple channels (12-bit ADC, ±2°C accuracy) |
| Fan Outputs | 8 mechanical relays, 5A continuous @ 115VAC/30VDC (surge 10A) |
| Tachometer Inputs | None |
| Communication | Mark V proprietary parallel backplane bus |
| Operating Temperature | 0°C to +60°C |
| LED Indicators | Power, Fan Run (8x), Over-Temp Alarm, Backplane Active |
Advantages and Distinctive Features
-
5A Mechanical Relays: The DS3800NGRC delivers 5A continuous (10A surge), suitable for 1/2 HP AC fans or multiple DC fans in parallel.
-
AC/DC Output Capability: Switches both AC and DC loads.
-
Full 8 Thermocouple Inputs: Comprehensive zone-by-zone temperature monitoring.
-
Complete Galvanic Isolation: 2500V isolation between control logic and fan power.
-
Simple, CPU-Dependent Operation: No onboard logic—cost-effective and easy to troubleshoot.
Typical Application Fields
-
Climate-Controlled Indoor Installations: 0°C to +60°C range.
-
Turbine Cabinets with Large AC Fans: Where 5A relay capacity is required.
-
High-Surge Fan Applications: Mechanical relays handle startup surges.
-
Budget-Conscious Applications: Cost-effective without tachometer feedback.
Comparison with Related Models
| Feature | DS3800NGRC | DS3800NGRA | DS3800NGDC | DS3800NFEE |
|---|---|---|---|---|
| Relay Current | 5A | 5A | 3A | 3A |
| Tach Inputs | None | None | None | None |
| T/C Inputs | 8 | 8 | 8 | 8 |
| ADC Resolution | 12-bit (±2°C) | 12-bit (±2°C) | 12-bit (±2°C) | 12-bit (±2°C) |
| Onboard Logic | No | No | No | No |
| 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 | Low | Low |
Selection Recommendations
-
Choose the DS3800NGRC if:
-
You need 5A mechanical relay outputs (AC or DC).
-
You do not require tachometer feedback.
-
You have a climate-controlled environment (0°C to +60°C).
-
You need 8 temperature sensors.
-
The Mark V CPU handles all control logic.
-
-
Choose the DS3800NGRA if: You need similar functionality but prefer the “NGRA” component revision (verify compatibility).
-
Choose the DS3800NGDC or DS3800NFEE if: You need 3A relays at lower cost.
Critical Precautions
-
ESD Protection: Always wear a grounded wrist strap.
-
Relay Contact Wear: Rated for 100,000 operations at 5A.
-
Inductive Load Derating: For inductive fan motors, derate to 3.5A or use external RC snubbers.
-
No Tachometer Inputs: Do not connect speed sensors.
-
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.
-
Firmware Compatibility: Compatible with all Mark V CPU firmware versions (v3.x and above).
GE IC693MDL741
ABB TU531
SCHNEIDER 140CPS12400
Reviews
There are no reviews yet.