In this video I take you on a quick tour of a typical older relay logic duplex DC elevator machine room. You'll see the duplex controller which is essentially three controllers in one, both elevators and the dispatcher. You'll also see the machines, over-speed governors, and the motor generators.
In this setup, the motor generators take a 3 phase AC motor to spin a DC generator. The controller controls the generator output current and polarity to the hoist motor which in turn controls speed and direction. It was a very effective but yet cumbersome system which requires a lot of maintenance.
Working on equipment like this can present a challenge due to the age and condition. Modifications and unauthorized repairs that aren't recorded on the electrical prints can make troubleshooting difficult. But if the equipment was maintained properly and the prints are accurate, then the challenge is only down to the skill of the troubleshooter. The highly skilled and knowledgeable elevator men who installed these machines are becoming more and more rare. Couple that with the condition and age of these machines and it makes sense to modernize the elevators with more safe and code compliant equipment, not to mention the efficiency levels go way up.
5 окт 2024
