2.12.7 Hoistway Access Switches
(a) on the wall outside of the hoistway within 300 mm (12 in.) of the entrance frame
(b) on the hoistway entrance frame or jamb
(c) on the sight guard
The switch shall be labeled "ACCESS" and shall be a three-position switch, labeled "UP," "OFF," and "DOWN" (in that order), with the "OFF" position as the center position. The switch shall be rotated clockwise to go from the "UP" position to the "OFF" position to the "DOWN" position.
(a) Operation by car and landing operating devices shall be disabled.
(e) The hoistway access switches at the landing and their operation shall be enabled in accordance with 22.214.171.124.3 except where either top-of-car inspection operation (see 126.96.36.199.2) or in-car inspection operation (see 188.8.131.52.3) is in effect.
(a) The operation of the hoistway access switch at the landing shall not render ineffective the hoistway door interlock or electric contact at any other landing, nor shall the car move if any other hoistway door is unlocked.
(b) The car shall not be operated at a speed greater than 0.75 m/s (150 ft/min). For elevators with static control, a means independent from the normal means to control the speed shall be provided to limit the speed of the car on hoistway access operation to a maximum of 0.75 m/s (150 ft/min), should the normal means to control this speed (mechanical, electrical, or solid-state devices) fail to do so.
The car speed-sensing device used for the means to limit the speed of the car while operating in response to an access switch shall be permitted to be either a separate car speed-sensing device from that of the normal speed control system or the same car speed-sensing device, provided that a separate means is used to continuously verify the proper operation of this speed-sensing device. Where the same car speed-sensing device is used, the detection of a failure of this car speed-sensing device while operating in response to an access switch shall cause the power to be removed from the driving-machine motor and brake.
The car speed-sensing device(s) and, where required, the verification means described above, shall conform to the following:
(1) a common actuating means (e.g., a driving-machine shaft, brake drum) shall be permitted, provided that it is not dependent on the following connection types, unless the connection is continuously monitored:
(-b) friction (except for interference fits)
(-c) a flexible coupling where positive engagement is not assured between coupling halves
Where monitoring is required, the monitoring shall detect a failure that prevents conformance with this requirement while operating in response to an access switch and shall cause the electric power to be removed from the elevator driving-machine motor and brake.
(2) a common member (e.g., tape, target, wire) that is sensed by both speed-sensing devices shall be permitted, provided that
(-a) the member is monitored so that when its presence is not detected while operating in response to an access switch, this shall cause the electric power to be removed from the elevator driving-machine motor and brake
(-b) the common member is securely mounted in such a manner that horizontal movement of the car shall not affect the operation of the sensors
(3) a common mounting means shall be permitted
(c) If the lowest landing is the normal means of access to the pit, the hoistway access switch shall enable the car to move in the up direction to a point between 2130 mm (84 in.) and 2450 mm (96 in.) from the floor level to the bottom of the platform guard, unless the travel of the car limits such movement.
(d) The movement of the car initiated and maintained by the access switch at a landing other than the lowest landing shall be limited in the down direction to a travel not greater than the height of the car crosshead above the car platform, and limited in the up direction to the distance the platform guard extends below the car platform.
(e) The hoistway access switch at the landing shall only control the movement of the car within the zone specified in (c) or (d). Control circuits related to, or operated by, the hoistway access switches shall comply with 184.108.40.206.1(c) through 220.127.116.11.1(e) and 18.104.22.168.