Elevator Guidelines for Emergency Generators - VTX

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March 1998 Elevator World45Passengers trapped in elevators need every opportunityto escape an Emergency situation. If designed to operate onstandby power, the Emergency generator must operate ele-vators safely and reliably. If the elevators do not operateproperly while on Emergency power, seri-ous consequences can most commonly ignored operation ofan Elevator is its ability to operate properlyon standby power. The American Society ofMechanical Engineers (ASME) andmost local codes require Elevator standbypower testing annually, with no-load andfull-load (125% of capacity) test every fiveyears. Furthermore, if more than one eleva-tor is capable of running simultaneously,they shall be tested shows that many buildingsignore this code requirement. Some large fa-cilities, including hospitals, have not testedany of the elevators on Emergency power inover 20 years! With the advent of SCR andVFAC drives for elevators and other devices,existing Emergency Generators are often notcapable of providing the proper power to op-erate the elevators in an in mind that older Elevator sys-tems often do not operate at the originalcontract speed.

46 March 1998 Elevator World The most common problems operating on emergency power discovered to date have been: 1. Increase in THD, up to a …

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