8.A122.6832.3113 Profibus Encoder with Ø20 mm AX Adapter

For 8.A122.6832.3113, EncoderWorks can provide a custom compatible replacement solution for large-bore Profibus absolute encoder systems where the key checks are ø20 mm H7 shaft fit, encoder-side locking-ring clamping, 70 mm torque-arm alignment, Profibus-DP Class 2 scaling, and three-M12 connector wiring. This model should not be handled like a standard 58 mm encoder, because the AX adapter and torque arm define the mechanical failure boundary before the fieldbus interface is even commissioned. Typical production lead time: 15 working days.

This configuration combines a Kübler AX hollow-shaft adapter with a Sendix 5868 Profibus absolute multiturn encoder. The AX section provides the ø20 mm bore, locking ring on the encoder side, and 70 mm torque arm, while the encoder body provides Profibus-DP V0 Class 2 absolute position feedback through three radial M12 connectors. Replacement work should focus on shaft fit, clamp torque, torque-arm preload, Profibus address, GSD setup, scaling parameters, preset behavior, and shield grounding.

System Limits

The first system limit is the AX mechanical installation. The ø20 mm shaft must match the adapter bore cleanly, and the locking ring must clamp from the encoder side without forcing the shaft or shifting the housing. Poor fit, shaft runout, or torque-arm preload can create bearing load, mechanical drift, or intermittent position deviation.

The second limit is Profibus commissioning. The PLC must preserve the original Profibus-DP Class 2 configuration, including address, GSD file, scaling, preset value, counting direction, and diagnostics. A replacement can appear online but still return the wrong mechanical position if the stored profile or scaling data is different.

The third limit is the AX operating envelope. The adapter is IP64 and has temperature-dependent speed limits. High ambient temperature, high shaft speed, or a loaded torque arm can become the practical operating limit even when the electrical Profibus communication is stable.

Wiring & Installation

Before replacement, record the Profibus address, GSD file, preset value, scaling parameters, direction setting, and diagnostic behavior from the controller project. Also record the three radial M12 connector assignments for bus wiring, supply, and any service or auxiliary connection.

During installation, confirm the ø20 mm H7 shaft fit, keep the locking ring on the encoder side, and align the 70 mm torque arm without preload. Route Profibus and power cables away from inverter output wiring, maintain shield continuity through the M12 connectors, and avoid ground loops between the encoder housing, machine frame, and cabinet earth. After startup, verify bus status, actual position, direction, preset response, torque-arm movement, and repeatability over several machine cycles.

Custom Compatible Solution

EncoderWorks can configure the replacement around the installed shaft and Profibus system:

• Match the AX ø20 mm hollow-shaft adapter, encoder-side locking ring, 70 mm torque arm, and mounting envelope
• Preserve Sendix 5868 Profibus-DP V0 Class 2 feedback, GSD setup, scaling, preset, and direction behavior
• Adapt the three radial M12 connector layout, supply range, bus wiring, and shield grounding
• Review clamp torque, shaft fit, torque-arm preload, IP64 installation limits, and temperature-speed margin

Key Data