ABB NTAC-02 58967441 Migration-Ready Pulse Encoder

Overview

ABB NTAC-02 58967441 Migration-Ready Pulse Encoder for Legacy Control Systems

The ABB NTAC-02 (part number 58967441) is a pulse encoder interface module engineered for seamless integration into ABB ACS800 and DCS800 series variable speed drives. As legacy drive platforms approach end-of-life and spare part availability tightens, the NTAC-02 has become a critical component in retrofit and modernization programs across pulp and paper, metals, marine propulsion, and heavy process industries. Whether you are replacing a failed encoder interface on an aging ACS800 cabinet or executing a planned migration from an obsolete drive platform, the NTAC-02 delivers the signal conditioning, channel isolation, and firmware compatibility required to maintain closed-loop speed control without rewriting the existing drive application program.

The module mounts directly onto the ACS800 option slot and interfaces with standard incremental encoders outputting HTL or TTL pulse signals. Its dual-channel architecture supports both A/B quadrature inputs and zero-pulse reference, making it compatible with the majority of encoder types already installed on legacy motor shafts — eliminating the need for encoder replacement during a drive swap. When migrating from an older NTAC-01 or RTAC-01 encoder interface, the NTAC-02 retains the same terminal block pinout and option board slot position, significantly reducing rewiring time and the risk of wiring errors during commissioning.

For sites running mixed fleets of ACS800 and DCS800 drives, the NTAC-02 is equally at home in both platforms, simplifying spare parts inventory management and reducing the number of unique line items that maintenance teams must stock. This cross-platform compatibility is particularly valuable in steel mills and paper machines where ACS800 and DCS800 units often share the same motor control center and are maintained by the same engineering team.

Migration Compatibility Table

Retrofit Planning for Existing Automation Systems

A successful NTAC-02 retrofit begins well before the module arrives on site. Maintenance engineers should first audit the existing drive cabinet to confirm the option slot assignment — on multi-drive ACS800 systems, option slots are shared with communication adapters such as the RPBA-01 PROFIBUS adapter or the RCAN-01 CANopen module, and slot conflicts must be resolved before the encoder board is installed. If the drive is also fitted with an RAIO-01 analog I/O extension module or an RDIO-01 digital I/O module, verify that the option slot matrix in the drive’s parameter group 98 is correctly mapped to avoid address conflicts after the NTAC-02 is seated.

Power supply integrity is the next checkpoint. The NTAC-02 draws its operating voltage from the drive’s internal 24 VDC auxiliary supply rail. On older ACS800 units where the APOW-01 power supply board has accumulated significant operating hours, it is advisable to measure the auxiliary rail voltage under load before committing to the encoder board swap. A degraded APOW-01 that cannot sustain the 24 VDC rail under combined option board load will cause intermittent encoder feedback faults even with a new NTAC-02 installed, leading to unnecessary repeat troubleshooting cycles.

Encoder cable screening and grounding deserve equal attention. Legacy installations often use unscreened or single-ended encoder cables that were adequate for the noise environment at the time of original commissioning but may introduce differential noise errors when the drive is upgraded to a newer firmware version with tighter encoder fault thresholds. Re-terminating the encoder cable shield at the NTAC-02 terminal block using the dedicated PE terminal, and verifying that the motor frame ground is bonded to the cabinet earth bar, eliminates the majority of nuisance encoder fault trips reported during retrofit commissioning.

For sites migrating from a legacy third-party drive platform to ACS800, the NTAC-02 must be paired with a compatible incremental encoder. Most 1024 PPR or 2048 PPR HTL encoders already mounted on the motor shaft are directly compatible, but the engineer should confirm the encoder supply voltage matches the NTAC-02’s HTL input range (10–30 VDC) and that the cable run length does not exceed the module’s specified maximum to avoid signal degradation. Where the existing encoder is a resolver or absolute encoder, a signal converter will be required upstream of the NTAC-02 terminal block.

Finally, before closing the cabinet and returning the drive to service, verify the ACS800 application program’s speed feedback source parameter (parameter 50.01) is set to ENCODER and that the encoder pulses-per-revolution value (parameter 50.02) matches the installed encoder specification. On drives running the ABB Standard Application Program or the Speed Regulated Application, these parameters are accessible via the CDP312R control panel or through DriveWindow Light connected via the RUSB-02 USB-to-DDCS adapter — a tool that should be on every retrofit engineer’s kit list for ACS800 work.

Downtime Control During System Migration

Minimizing unplanned downtime during an NTAC-02 swap requires a structured pre-outage preparation protocol. Begin by uploading the complete drive parameter set to a laptop running DriveWindow Light or to the CDP312R panel memory before any hardware is disturbed. This parameter backup is the single most important step in protecting the existing application logic — it ensures that if the drive requires a factory reset during troubleshooting, the full parameter set including speed controller tuning, ramp times, torque limits, and I/O assignments can be restored in minutes rather than hours.

Schedule the physical swap during a planned maintenance window rather than responding reactively to a module failure. A proactive replacement of an NTAC-02 showing intermittent encoder fault history (fault code ENC-01 or ENC-02 in the ACS800 fault log) avoids the far more costly scenario of an unplanned process shutdown. Keep at least one NTAC-02 in local stock as a cold standby — the module’s compact form factor and sealed construction make it straightforward to store in a standard spare parts cabinet without special environmental controls.

During the swap itself, the physical installation takes under ten minutes: power down the drive, discharge the DC bus, unseat the old encoder board from the option slot, seat the NTAC-02, reconnect the encoder terminal block, and restore power. The drive will auto-detect the new option board on the next power cycle. The remaining commissioning time — parameter verification, encoder direction check, and a no-load speed ramp test — typically adds another 20 to 40 minutes depending on site access and the complexity of the application program. For critical production lines where even a two-hour window is difficult to obtain, pre-staging a fully parameterized spare drive with the NTAC-02 already installed allows a complete drive swap in under 30 minutes, with the original unit returned to the workshop for module replacement at leisure.

All NTAC-02 units supplied by KNMKS are function-tested prior to dispatch. Each module undergoes encoder signal loop-back verification and option board communication handshake testing to confirm correct operation before packaging. This pre-shipment testing protocol reduces the risk of receiving a non-functional module and eliminates the need for incoming inspection on the customer’s side, allowing the module to move directly from the shipping box to the drive cabinet.

Retrofit Support FAQ

Q1: Is the NTAC-02 a direct drop-in replacement for the NTAC-01?
Yes. The NTAC-02 uses the same option slot connector and terminal block pinout as the NTAC-01. No rewiring or mechanical modification is required. After seating the new module, verify parameter group 50 settings and perform a short no-load test run to confirm encoder direction and pulse count.

Q2: What encoder types are compatible with the NTAC-02?
The NTAC-02 accepts incremental encoders with HTL (10–30 VDC) or TTL (5 VDC) output signals in A/B quadrature format with optional zero pulse. Resolvers and absolute encoders (SSI, EnDat, HIPERFACE) are not directly compatible and require a signal converter. Most standard industrial encoders with 512, 1024, or 2048 PPR resolution are supported.

Q3: How do I verify the NTAC-02 is communicating correctly with the ACS800 after installation?
After power-up, navigate to parameter group 98 (option modules) on the CDP312R panel or DriveWindow Light. The NTAC-02 should appear as a recognized option board in the assigned slot. Then check parameter 50.01 (speed feedback selection) is set to ENCODER and monitor the actual speed signal in the signal group to confirm the encoder is returning a valid pulse count during a low-speed jog.

Q4: What support terms and stock availability does KNMKS offer for the NTAC-02?
All NTAC-02 units are covered by a support terms confirmed by quotation from the date of dispatch. Units are held in regional stock and are available for same-week dispatch in most cases. Each module is function-tested before shipment. For urgent requirements or blanket stock agreements to support ongoing maintenance programs, contact the KNMKS sales team directly.

© 2026 KNMKS. All rights reserved.
Original Source: https://knmks.com
Contact: admin@knmks.com | +86 18359268345

Product Identification

Brand / Ecosystem

ABB
ABB

Model / Series

NTAC-02-58967441
S800 Series

Product Family

Servo Systems

Availability Status

Available on request after model and quantity confirmation

Inquiry Type

B2B RFQ, replacement inquiry and project spare-part request

Pre-Quote Check

Exact SKU, brand, series, quantity, nameplate photos and destination country are checked before quotation

Specification & Inquiry Focus

Motion range

Servo drives, motors and cable sets

Common needs

Power, encoder and brake confirmation

Project support

Motion upgrade and spare-part supply

Inquiry Support

• Motor, drive and cable set coordination
• Power rating and encoder type checking
• Motion control replacement support

What to Send Us

• Brand and exact model number: ABB NTAC-02-58967441
• Quantity and required delivery time
• Application, replacement requirement or nameplate photo
• Destination country and shipping preference