2.26.8 Release and Application of Driving-Machine Brakes
One of the means shall be either a contactor or a SIL rated device(s) with a SIL of not less than the highest SIL of the function for the electrical protective devices involved with removing power from the brake and shall be listed/certified in accordance with the applicable requirements of IEC 61508-2 and IEC 61508-3. SIL rated devices shall be identifiable on wiring diagrams [see 22.214.171.124.2(a)] with part identification, SIL, and certification identification information that shall be in accordance with the certifying organization's requirements. This means is not required to remove power from the driving-machine motor.
If the brake circuit is ungrounded, power shall be interrupted at all power feed lines to the brake.
Assemblies containing SIL rated devices shall be labeled or tagged with the statement: "Assembly contains SIL rated devices. Refer to Maintenance Control Program and wiring diagrams prior to performing work."
(c) any electrical protective device is activated
(d) there is a loss of power to the driving-machine brake
(e) the traction-loss detection means is actuated [see 126.96.36.199(c)]