Description
Product Introduction
The DS3800NHVK1A1A is an enhanced version of the high-voltage kontrol interface board—the NHVK with improved diagnostics. The suffix tells the story: the first “1” indicates a hardware revision with improved isolation and output driver protection. The “A” specifies the standard configuration. The second “1” adds enhanced diagnostic features (configuration verification, output monitoring). The final “A” is the standard environmental package (no conformal coating). This board was designed for installations where better diagnostic feedback was needed for high-voltage kontrol applications.
The enhanced diagnostics verify the board’s configuration and provide detailed status reporting on the control outputs. Compare this to the base DS3800NHVK (standard diagnostics). The 1A1A gives you the same basic functionality with better diagnostic feedback.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Interface Type | High-voltage kontrol interface with enhanced diagnostics |
| Voltage Rating | High-voltage (specific ratings depend on configuration) |
| Isolation | Electrical isolation for backplane protection |
| Control Outputs | Configurable (depending on configuration) |
| Diagnostic Features | Configuration verification, output monitoring, error logging |
| Diagnostic LEDs | Power, Link Status, Output Status, Config OK, Fault |
| Backplane Interface | Parallel, Mark IV-specific |
| CPU Compatibility | DS3800DMP series (Mark IV) — firmware v3.0 or later recommended |
| Backplane Current Draw | +5V DC @ 0.8A, +12V DC @ 0.3A |
| Operating Temperature | 0 to 60°C (non-condensing) |
| Dimensions | 328 mm x 185 mm x 20 mm (full-length Mark IV) |
| Mounting | Standard Mark IV rack slot |
| Configuration | No DIP switches—hardware address fixed |
Compatible Replacement Models
| Model | Compatibility Level | Notes |
|---|---|---|
| DS3800NHVK | ⚠️ Software Compatible | Base model without enhanced diagnostics. Hardware fits, but you lose output monitoring. |
| DS3800NHVK1 | ⚠️ Software Compatible | Hardware revision without enhanced diagnostics. |
| DS3800NHVK1A | ⚠️ Software Compatible | Enhanced configuration without diagnostic features. |
| DS3800NHVK1A1 | ✅ Drop-in Replacement | Same board without the “A” coating. Functionally identical. |
| DS3800NHVD1A1A | ✅ Drop-in Replacement | Similar high-voltage digital interface—check configuration. |
Frequently Asked Questions (FAQ)
What’s the difference between the NHVK1A1A and the base NHVK?
The 1A1A adds enhanced diagnostics—configuration verification, output monitoring, and error logging. The base NHVK has basic link status only. The output monitoring gives you visibility into the health of each control output.
What’s the “Output Status” LED?
The Output Status LED indicates the health of the control output drivers. The board monitors output current and voltage. Green means all outputs are functioning correctly. Red means an output fault—check the actuator or valve wiring.
Do I need to upgrade my DMP firmware for the enhanced diagnostics?
The enhanced diagnostics require DMP firmware v3.0 or later. Older firmware won’t recognize the diagnostic registers. We can provide the firmware EPROMs if you need them.
What’s the voltage rating of this board?
The voltage rating depends on the specific configuration. Check the board’s label or your system documentation for the exact voltage rating.
Can I hot-swap this board?
No. Mark IV backplanes are not hot-swappable. Power down the cabinet, lock out the breaker, and wait 60 seconds before removing or installing the board.
What’s your warranty and lead time?
We stock the NHVK1A1A in limited quantities. Lead time is 1-2 business days. We offer a 1-year warranty. We test every board with a 24-hour burn-in and a diagnostic verification. The test report is included.
Is this board compatible with the Mark VIe?
No. This board is for Mark IV systems only. The backplane architecture is different.

GE VMIVME-7750-74000
GE VMIVME-7750
Moore 16413-1-15
GE IS220PDIOH1B
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