Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | NTAC-02 |
| ABB Part Number | 58967441E |
| Product Type | Pulse Encoder Interface Module |
| Primary Application | ABB drive encoder feedback |
| Encoder Channels | A, B, Z |
| Encoder Input | Differential pulse signals |
| Encoder Supply | 15 VDC / 24 VDC selectable |
| Module Supply | 24 VDC |
| Communication | ABB DDCS optical link |
| Maximum Encoder Frequency | Up to 1 MHz |
| Encoder Supply Capacity | 250 mA max. at 100 kHz |
| Mounting | DIN rail |
| Compatible Application Software | ACS 600 Standard Application Program V5.0+; System Application Program V4.2+; Crane Drive Application Program V5.0+ |
| Function | Speed / position feedback |
| Status | Discontinued |
ABB’s installation guide shows the encoder terminals as A+, A−, B+, B−, Z+, Z−, plus shield connections. It also documents selectable 15/24 V encoder supply and a 24 VDC module supply.
The NTAC-02 communicates with the drive through an optical DDCS link. ABB documentation states that NTAC modules can be connected in a DDCS ring and assigned individual node addresses through internal DIP switches.
Product Introduction
The ABB NTAC-02 58967441E is a pulse encoder interface module designed for ABB drive control systems that require digital feedback from a motor shaft. It accepts incremental encoder signals through A, B, and Z channels and transfers the feedback information to the drive through ABB’s optical DDCS communication interface. This allows the drive control system to use shaft-speed or position information for closed-loop motor control.
For maintenance teams, the important point is that NTAC-02 is a drive feedback interface, not a general-purpose PLC I/O module. ABB specifically documents compatibility with several ACS 600 application-program generations. The manufacturer also explicitly states that NTAC-01 and NTAC-02 are not interchangeable, so substituting another NTAC version based only on physical appearance is a poor maintenance practice.
NTAC-02 58967441E
Application Scenarios & Field Pitfalls
Engineering Pain Point
Older ABB drives frequently depend on an encoder interface for accurate speed regulation, torque control, positioning, or synchronization. A failed NTAC-02 can therefore cause a drive to lose speed feedback even though the main inverter and motor remain operational.
Typical Applications
- ACS 600 variable-frequency drives requiring incremental encoder feedback.
- High-performance motor control where open-loop speed estimation is insufficient.
- Crane and hoist systems requiring accurate motor-speed feedback.
- Industrial machinery requiring closed-loop speed or position regulation.
ABB specifically lists the ACS 600 Standard, System, Crane Drive, and Application Program Template software families as compatible application environments for .
Technical Pitfalls to Avoid
- Do not confuse with a general I/O module. Its purpose is specifically digital pulse-encoder interfacing.
- Do not assume NTAC-01 is a drop-in replacement. ABB explicitly states that NTAC-01 and are not interchangeable.
- Check encoder wiring carefully. The interface uses separate A/B/Z differential connections. Reversing A and B changes the perceived rotation direction; incorrect Z wiring can also affect applications using the encoder index signal.
- Verify encoder supply selection. The provides selectable 15 VDC or 24 VDC encoder supply. The encoder’s actual voltage requirement must be checked before energizing the replacement.
- Verify the drive software generation. ABB documents specific minimum application-program versions for compatibility. A physically correct module can still be unsuitable if the drive firmware/application environment is incompatible.
Related Products
- NTAC-01 — Earlier ABB pulse encoder interface. Related function, but not interchangeable with according to ABB documentation.
- NDIO-01 — ABB digital I/O extension module in the same NTAC/NDIO/NAIO external-module family; different signal function.
- NAIO-01 — ABB analog I/O extension module; intended for analog signals rather than pulse-encoder feedback.
- NIOC-01 — ABB standard I/O board used within the drive control architecture; it is not a substitute for the dedicated NTAC encoder interface.
- NAMC — ABB Application and Motor Control Board that acts as the master on the DDCS link connecting external modules such as NTAC.
- ACS 600 — Primary legacy ABB drive family associated with compatibility.
- ACS1000i / ACS1000W control systems — ABB documentation also shows as the optional pulse encoder interface within these drive control systems.
Procurement Check
For ABB 58967441E, verify the complete part number, designation, drive model, application-program version, encoder manufacturer/model, encoder voltage, A/B/Z wiring, and DDCS connection before replacement.
The most important procurement distinction is simple: is an ABB pulse encoder interface, not a generic digital I/O or communication module. If the existing drive specifically calls for , do not substitute NTAC-01 merely because both modules provide encoder feedback.
