When replacing 805985-01 ISA 608, EncoderWorks provides a custom compatible replacement solution focused on maintaining SSI Gray communication behavior, cable-based installation compatibility, and 25-bit multiturn position consistency. The replacement challenge is not only matching the absolute feedback resolution, but also preserving SSI clock/data transmission, Gray code interpretation, and controller-side position processing. SSI feedback can be transmitted successfully while incorrect data interpretation or signal timing differences still affect machine positioning accuracy.
System Limits
SSI replacement reliability depends on maintaining consistent serial communication behavior between the encoder and the controller. The 805985-01 ISA 608 uses SSI Gray output with 25-bit absolute resolution, including 13-bit singleturn and 12-bit multiturn position data. Clock timing, Gray code interpretation, code sequence direction, and preset functions must be matched because differences in serial data handling can cause incorrect position values or additional commissioning work.
The mechanical integration boundary includes shaft fit, flange structure, and cable installation conditions. This model uses a Ø10 mm round shaft with a clamping flange (61sp-type) mounting configuration and a 1.5 m radial cable connection. Shaft alignment, coupling stability, cable routing, shielding, and grounding continuity should be maintained because mechanical mismatch or electrical interference can affect long-term feedback reliability.
Wiring & Installation
SSI integration requires verification of clock, inverted clock, data, inverted data, and control signal connections. The configuration includes dedicated SSI clock and data signals together with zero set and code sequence functions. Incorrect signal mapping, missing inverted signal connections, or insufficient shielding continuity may result in unstable serial communication or inaccurate position evaluation.
During replacement installation, the Ø10 mm shaft interface and clamping flange mounting should be checked against the existing machine coupling system. Cable routing, environmental sealing, vibration conditions, and grounding methods should be considered together to maintain stable SSI feedback performance in industrial applications.
Custom Compatible Solution
- Match SSI Gray communication behavior and controller-side serial data interpretation.
- Preserve 25-bit absolute multiturn position structure and code sequence configuration.
- Adapt Ø10 mm round shaft and clamping flange (61sp-type) mechanical mounting requirements.
- Validate SSI timing, signal mapping, shielding, and grounding conditions.
Typical production lead time: 15 working days.
Key Data
| Parameter | Specification |
|---|---|
| Model | 805985-01 ISA 608 |
| Encoder Type | Absolute Multiturn Encoder |
| Interface | SSI Gray |
| Resolution | 25 bit (13 bit singleturn + 12 bit multiturn) |
| Output Format | Gray Code |
| Shaft Type | Ø10 mm Round Shaft |
| Flange Type | Clamping Flange (61sp-Type) |
| Connection | Radial Cable |
| Cable Length | 1.5 m |
| Supply Voltage | 5–30 VDC |
| Protection | IP66 / IP67 |
| Main Replacement Focus | SSI data mapping, Gray code interpretation, and mechanical adaptation |
