811858-01 RHA 507 SSI Hollow Shaft Compatibility

When replacing 811858-01 RHA 507, EncoderWorks provides a custom compatible replacement solution focused on maintaining SSI Gray communication behavior, Ø14 mm blind hollow shaft adaptation, and singleturn position data consistency. The replacement challenge is not only matching the 13-bit absolute feedback output, but also preserving SSI clock/data timing, signal interpretation, and the mechanical coupling conditions required by the existing control system. SSI communication can remain available while incorrect timing, data handling, or mechanical alignment still affects position accuracy.

System Limits

SSI replacement reliability depends on maintaining consistent serial communication between the encoder and the controller. The 811858-01 RHA 507 uses SSI Gray output with 13-bit singleturn resolution and supports code sequence configuration. Clock timing, inverted clock/data signals, hold function, and Gray code interpretation must be matched because differences in serial data processing can result in incorrect position values or additional commissioning adjustments.

The mechanical integration boundary includes hollow shaft fit, stator coupling, and installation stability. This model uses a Ø14 mm blind hollow shaft with a 58/59 flange and stator coupling structure, together with a 5 m radial cable connection. Shaft engagement, coupling alignment, cable routing, shielding, and grounding continuity should be maintained because mechanical mismatch or electrical interference can affect long-term feedback reliability in industrial applications.

Wiring & Installation

SSI integration requires verification of clock, inverted clock, data, inverted data, hold, code sequence, power supply, and shield connections. The configuration uses dedicated SSI signal wiring through the radial cable connection. Incorrect signal mapping, missing inverted signal connections, poor shielding continuity, or improper grounding may result in unstable serial communication or inaccurate position evaluation.

During replacement installation, the Ø14 mm blind hollow shaft and stator coupling interface should be checked against the existing machine structure. The radial cable outlet, cable routing length, vibration conditions, and environmental protection requirements should be considered together to maintain reliable SSI feedback performance.

Custom Compatible Solution

• Match SSI Gray communication behavior and controller-side serial data interpretation.
• Preserve 13-bit singleturn position structure and code sequence configuration.
• Adapt Ø14 mm blind hollow shaft and 58/59 flange with stator coupling requirements.
• Validate SSI timing, signal mapping, shielding, and grounding conditions.

Typical production lead time: 15 working days.

Key Data