18.104.22.168 Protection Against Traction Loss
(a) be based on the type of suspension members and the application.
(b) detect relative motion [see 2.20.11, 22.214.171.124.2(cc)(3), and 126.96.36.199.12] between the drive sheave and suspension members before any suspension member parts, and function in accordance with (c) in not greater than the smaller of the following:
(1) 45 s
(2) the time for traveling the full travel, plus 10 s, with a minimum of 20 s if the full travel is less than 10 s
NOTE [188.8.131.52(b)]: This relative motion between suspension members and drive sheave is independent of normal creep (see Section 1.3) of the suspension members. Compliance with the detection requirement can be accomplished by any method that will determine the relative position of the suspension means with respect to the rotational position of the drive sheave. This can be accomplished by timers or position- and velocity-measuring devices, as an example.
(c) when actuated, cause the removal of electrical power from the driving-machine motor and brake. The means shall comply with the requirements of 184.108.40.206, 2.26.7, 220.127.116.11, 18.104.22.168.3, and 22.214.171.124.3. No single ground shall render the traction-loss detection means ineffective.
(d) once actuated by traction loss, comply with the following:
(1) The traction-loss detection means shall remain actuated until it is manually reset.
(4) The removal or restoration of mainline power shall not reset the traction-loss detection means.