Description
Product Introduction
The DS3800NHVN1A1A is an enhanced version of the high-voltage neutral interface board—the NHVN with improved diagnostics. The suffix tells the story: the first “1” indicates a hardware revision with improved isolation and signal conditioning. The “A” specifies the standard configuration. The second “1” adds enhanced diagnostic features (configuration verification, neutral point 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 neutral applications.
The enhanced diagnostics verify the board’s configuration and provide detailed status reporting on the neutral points. Compare this to the base DS3800NHVN (standard diagnostics). The 1A1A gives you the same basic functionality with better diagnostic feedback.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Interface Type | High-voltage neutral interface with enhanced diagnostics |
| Voltage Rating | High-voltage (specific ratings depend on configuration) |
| Isolation | Electrical isolation for backplane protection |
| Neutral Points | Configurable (depending on configuration) |
| Diagnostic Features | Configuration verification, neutral point monitoring, error logging |
| Diagnostic LEDs | Power, Link Status, Neutral 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 |
|---|---|---|
| DS3800NHVN | ⚠️ Software Compatible | Base model without enhanced diagnostics. Hardware fits, but you lose neutral point monitoring. |
| DS3800NHVN1 | ⚠️ Software Compatible | Hardware revision without enhanced diagnostics. |
| DS3800NHVN1A | ⚠️ Software Compatible | Enhanced configuration without diagnostic features. |
| DS3800NHVN1A1 | ✅ Drop-in Replacement | Same board without the “A” coating. Functionally identical. |
| DS3800NHVL1A1A | ✅ Drop-in Replacement | Similar high-voltage line interface—check configuration. |
Frequently Asked Questions (FAQ)
What’s the difference between the NHVN1A1A and the base NHVN?
The 1A1A adds enhanced diagnostics—configuration verification, neutral point monitoring, and error logging. The base NHVN has basic link status only. The neutral point monitoring gives you visibility into the health of each neutral termination point.
What’s the “Neutral Status” LED?
The Neutral Status LED indicates the integrity of the neutral termination points. The board monitors each neutral point for proper grounding and isolation. Green means all neutrals are healthy. Red means one or more neutral points are degraded—check the field 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 NHVN1A1A 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..


Rexroth MHD093C-058-PG1-AA
REXROTH MHD093C-058-PG1-AA
ICS TRIPLEX(ROCKWELL) T8431
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