ABB NINT-68 Series Power & Fiber Optic Interface Module

Description

Key Technical Specifications

Product Introduction & Supply Chain Strategy

The ABB NINT-68 (NINT-68C, catalog code 64396556) is a vital main interface circuit board built for the ABB ACS800 industrial AC drive family. Positioned between the main RMIO control board and the inverter power stage, the NINT-68 processes fiber-optic firing commands, distributes control voltages, and routes feedback signals (such as current measurements and DC-link status) back to the central processor.

This board is supplied as Brand New Surplus stock—never deployed, pulled from old drive cabinets, or rebuilt. Relying on refurbished or pulled interface boards in heavy-duty ACS800 drives carries significant operational risk. Aging solder joints, micro-cracks from heat cycling, and degraded optical transmitters on used NINT cards can cause intermittent firing pulses to the IGBTs. A missing or corrupt gate trigger signal can trigger destructive phase imbalance, short circuits, or sudden overcurrent trips on the drive. Installing a verified New Surplus NINT-68 unit ensures pristine fiber-optic signal transmission, original factory insulation resistance, and long-term operating stability.

NINT-68

NINT-68

Installation & Configuration Guide

Stage 1: Pre-Installation & Safety

1. Perform full Lock-Out/Tag-Out (LOTO) on the main AC input power supply and auxiliary control power.
2. Safety Wait Time: Allow the drive’s internal DC-link capacitors to fully discharge (minimum 5 minutes). Measure voltage across DC+ and DC- terminals with a calibrated multimeter to confirm < 50 V DC before opening module covers.
3. Wear an ESD grounding wrist strap connected to cabinet chassis ground before handling the replacement NINT-68 board.

Stage 2: Removal

1. Carefully disconnect all fiber-optic pairs (note transmitter/receiver color codes: plastic connectors are color-coded red and black). Do not bend fiber cables tighter than their minimum bend radius.
2. Unplug ribbon connectors and power supply wiring harnesses attached to the board face.
3. Remove the mounting screws securing the board to the drive module frame and carefully pull the card from its standoffs.

Stage 3: Installation

1. Position the new NINT-68 board over the chassis standoffs and hand-tighten the retaining screws (0.8 N·m). Ensure grounded screw pads make clean metal contact with the chassis.
2. Reconnect all power harness plugs and ribbon cables firmly into their matching header sockets.
3. Reinsert fiber-optic cables into their respective ports (black to black, red to red), ensuring locking tabs latch securely.

Stage 4: Power-On & Testing

1. Re-energize control power and verify that green onboard status LEDs illuminate without fault signals.
2. Check the ACS800 CDP-312R control panel or DriveWindow software for any active fiber-optic fault or gate interface alarms (e.g., PPCC LINK or SHORT CIRCUIT).
3. Run the drive under light-load conditions to confirm smooth IGBT switching and proper current measurement telemetry.

Firmware/Software Versions & Upgrade Notes

• Direct Hardware Compatibility: The NINT-68 (NINT-68C) is a hardware-transparent interface board. Swapping the board requires no parameter reprogramming or firmware downloads on the RMIO control board.
• Revision Notes: The “C” suffix in NINT-68C indicates a updated revision/conformal coating layer. NINT-68C directly replaces earlier revision variants of the NINT-68 card without mechanical or electrical modification.

Frequently Asked Questions (FAQ)

Is this ABB NINT-68 / NINT-68C board brand new or refurbished?

This product is supplied as Brand New Surplus. It is guaranteed unused, fully intact, and thoroughly inspected prior to dispatch.

What is the primary role of the NINT-68 in an ACS800 drive?

The NINT-68 serves as the main interface card that routes gate control signals (via fiber optics) from the main RMIO board to the power stage while feeding back current, temperature, and fault signals.

What causes PPCC LINK communication errors on the ACS800?

PPCC LINK faults are usually caused by damaged fiber-optic cables, loose optical plugs, dirty fiber ends, or a failing optical transmitter/receiver chip on the NINT interface board.

Are NINT-68 and NINT-68C interchangeable?

Yes, NINT-68C is the enhanced, revision-updated replacement for the NINT-68 board and drops directly into the same mounting slot.

What warranty and packaging accompany this board?

All New Surplus ABB NINT-68 boards ship in anti-static ESD shielding bags with factory serial tags, QC inspection documentation, and a full 1-year operational replacement warranty.