When an automation system which includes an encoder must be certified to a specific Performance Level (PL) or Safety Integrity Level (SIL), the design of its safety system must consider both mechanical and electrical details. For those instances, the Leine & Linde 862 rotary encoder series with modified hollow shaft is now available.
The mechanics of a machine safety system must provide a primary and secondary fixation method of an encoder shaft to the active machine. The Leine & Linde XHI862 encoders certified for Functional Safety applications include a dowel pin within the hollow shaft to engage with a complimentary slot in the machine shaft to do just that.
The engagement of the encoder pin (4mm in diameter) and motor shaft slot assure that the encoder will be properly mounted and engaged with the machine even if the primary fixation should fail.
MTTFd and PFHd values are provided with the product documentation.
Electrical interfaces include sinusoidal (1 Volt peak-peak) and High Current HTL. The reliability of each version is established per EN ISO 13849-1 and IEC 61508.
For more information on these encoders, click here.