8.A12C.M134.3412 Analog Encoder with Ø45 mm AX Adapter

For 8.A12C.M134.3412, EncoderWorks can provide a custom compatible replacement solution for large-shaft analog absolute feedback systems where the key checks are ø45 mm H7 bore fit, encoder-side locking-ring clamping, 70 mm torque-arm preload, 4–20 mA signal scaling, and radial M12 wiring. This model should not be treated like the 0–10 V version, because the controller reads position through a current-loop analog input and depends on the correct mA range, zero/span calibration, direction, and limit-switch behavior. Typical production lead time: 15 working days.

This configuration combines a Kübler AX hollow-shaft adapter with a Sendix M5861 analog absolute encoder. The AX section provides the ø45 mm hollow-shaft bore, locking ring on the encoder side, and 70 mm torque arm, while the encoder body provides 12-bit position conversion through a 4–20 mA analog output. Replacement work should focus on shaft fit, clamp torque, torque-arm alignment, current-loop input compatibility, scaling range, supply voltage, M12 connector assignment, limit-switch function, and shield grounding.

System Limits

The first system limit is 4–20 mA scaling. The controller analog input must match the expected current range, zero point, span, direction, and filter settings. If the loop current is stable but the PLC scaling table is wrong, the machine can move to an incorrect position without showing a communication fault.

The second limit is AX mechanical installation. The ø45 mm shaft must match the H7 adapter bore without forcing the clamp, and the locking ring must clamp from the encoder side. Because this is the largest listed AX bore, shaft runout, clamp torque, and torque-arm preload must be controlled carefully to avoid housing movement or repeatability drift.

The third limit is the AX operating envelope. The adapter is rated IP64 and has temperature-dependent speed limits. High ambient temperature, high shaft speed, or a loaded torque arm can become the practical failure boundary before the analog output itself becomes unstable.

Wiring & Installation

Before replacement, record the M12 connector wiring for supply, ground, 4–20 mA output, shield, and any limit-switch or expandable function used by the controller. Also record the analog input type, loop wiring method, zero value, full-scale value, direction setting, filter time, and alarm thresholds from the PLC or drive.

During installation, confirm the ø45 mm H7 shaft fit, keep the locking ring on the encoder side, and align the 70 mm torque arm without preload. Route the analog signal cable away from inverter output wiring, maintain shield continuity through the M12 connector, and avoid ground loops between the encoder housing, machine frame, and cabinet earth. After startup, verify current at zero, current at full travel, direction trend, repeatability, limit-switch behavior, and torque-arm movement over several machine cycles.

Custom Compatible Solution

EncoderWorks can configure the replacement around the installed shaft and analog control system:

• Match the AX ø45 mm hollow-shaft adapter, encoder-side locking ring, 70 mm torque arm, and mounting envelope
• Preserve Sendix M5861 4–20 mA analog position behavior, 12-bit scaling, direction, and limit-switch function
• Adapt the radial M12 connector layout, 10–30 VDC supply range, current-loop wiring, and shield grounding
• Review clamp torque, large-bore shaft fit, torque-arm preload, IP64 installation limits, analog noise margin, and temperature-speed operating margin

Key Data