KJA Consultants Inc.

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Elevator and Escalator Consulting Engineers

What Should be Modernized?

Where new technology has rendered earlier designs obsolete, modernization should be considered.

Any installation with motor generator sets (Ward Leonard speed control) is a candidate for modernization.
 
Any installation using two speed AC motor drive is a candidate for modernization.
 
Hydraulic machines are not candidates for modernization since there is nothing new in hydraulic valves. The electrical control systems, however, are often dated and can benefit from replacement.

An hydraulic unit with an in-ground cylinder is a definite candidate for conversion to a roped hydraulic or to a traction machine since there is no guaranteed way of ensuring the longevity or safety of the buried cylinder.