1980s Pickerings TVC Lift Motor Room

[@Lift.Tracker]

⛔️⚠️ It’s important to mention the many dangers which are present in lift motor rooms. They are not environments for the inexperienced, and one mistake could be the last thing you do. There are exposed terminals with voltages of up to 415 volts. If you touch them, they WILL kill you. Please do not put yourself into this dangerous environment without proper authorisation. ⛔️⚠️

[@TheLiftDragon]

Really nice to see and hear other PFC drives than the ones I'm used to working in detail. Thx for sharing!

[@hariranormal5584]

sounds amazing wow

[@sictransitgloriamundi230]

How do you realize three speeds with a relay circuit on this motor? I could not see a frequency converter in the control.

[@aprilkolwey4779]

The metal thing with a card rack near the top of the controller is a PFC/ACVV/phase-angle/whatever (take your pick as to the name, they're all more or less the same thing) drive. It doesn't change the frequency like a VFD does, instead it chops up the waveform in a manner largely equivalent to rapidly turning the motor off and back on, causing it to be weaker by a controllable amount. Combine that with either a tachometer or encoder and you can accomplish reasonably acceptable speed control this way.

[@urgentkestrel7990]

That motor room looks similar to a video you’d see on the MrMatt&MrChay Channel