ASME A17.3:2020 pdf free download

ASME A17.3:2020 pdf free download
ASME A17.3:2020 pdf free download.Includes Requirements for Electric and Hydraulic Elevators and Escalators
3.10.7 Operating of the Driving Machine With a HoistwayDoorUnlocked oraHoistwayDoor or a Car Door Not in the Closed Position
Operating ofthe driving machine with a hoistway door unlockedorahoistwaydoororacardoornotinthe closed position shall be permitted under either of the following conditions:
(a) by a car-leveling or truck-zoning device
(b) when a hoistway access switch is operated
(c) when the top-of-car or in-car inspection operation usingacar-doorbypass orhoistway-doorbypassswitchis activated
Devices other than those specified above shall not be provided to render hoistway-door interlocks, the electric contacts ofhoistway-door combination mechanical locks and electric contacts, orcar door, gate electric contacts, or car door or gate interlock inoperative. Existing devices that do not conform to the above shall be removed.
3.10.8 Release and Application of Driving Machine Brakes
Driving-machine brakes shall not be electrically released until power has been applied to the driving- machine motor.
Two devices shall be provided to remove power inde- pendently from the brake. If the brake circuit is ungrounded, all power lines to the brake shall be opened. The brake shall apply automatically when
(a) the operating device of a car switch or continuous pressure operation elevator is in the stop position
(b) a floor stop device functions
(c) any of the electrical protective devices in 3.10.4 functions
Underconditions describedin(a) or(b), the application ofthe brake shall be permitted to occur on or before the completion of the slowdown and leveling operations.
The brake shall not be permanently connected across the armature or field ofa direct current elevator driving- machine motor.
3.10.9.1 The failure ofanysingle magneticallyoperated switch, contactor, or relay to release in the intended manner or the occurrence of a single accidental ground or combination of accidental grounds shall not permit the car to start or run ifany hoistway-door inter- lockisunlockedorifanyhoistway-doororcardoororgate electric contact is not in the closed position.