Thanks so much for putting out this content! So much we would never otherwise, particularly as what's still left of this equipment is dissapearing. Obviously it is ancient by todays standards but still so fascinating and sophisticated for its time.
Dandy vintage geared traction elevator, controllers and floor selectors. Those were built "Otis Tough" to last for decades and be repairable. Were there originally four DC traction elevators as the MG sets were dual output? And the one that burned out one of those removed? I remember prior to starting a maintenance engineer position at a local hotel (one year earlier) I meet up with an out of town guest. They had two traction elevators. I heard this awful grinding noise from the MG set in the lobby elevator; could not have been the machine. I mentioned it to the front desk. I discovered upon hiring, the bearings were shot in the MG. Hmm wonder why maintenance did not shut it down? These were geared with a microprocessor controller.
One generator supplies a fixed voltage for control circuits, motor field, brake etc, the other provides a variable output to control the traction motor with a series field and inter poles in some cases to compensate for load, the smaller generator would be replaced by a simple rectified power supply on a more modern DC lift
Now we’re talking 😉🇬🇧🇬🇧🇬🇧🇬🇧
Thanks so much for putting out this content! So much we would never otherwise, particularly as what's still left of this equipment is dissapearing. Obviously it is ancient by todays standards but still so fascinating and sophisticated for its time.
Not so ancient. There’s still some us oldies still around who remember installing this equipment.
Dandy vintage geared traction elevator, controllers and floor selectors. Those were built "Otis Tough" to last for decades and be repairable. Were there originally four DC traction elevators as the MG sets were dual output? And the one that burned out one of those removed? I remember prior to starting a maintenance engineer position at a local hotel (one year earlier) I meet up with an out of town guest. They had two traction elevators. I heard this awful grinding noise from the MG set in the lobby elevator; could not have been the machine. I mentioned it to the front desk. I discovered upon hiring, the bearings were shot in the MG. Hmm wonder why maintenance did not shut it down? These were geared with a microprocessor controller.
One generator supplies a fixed voltage for control circuits, motor field, brake etc, the other provides a variable output to control the traction motor with a series field and inter poles in some cases to compensate for load, the smaller generator would be replaced by a simple rectified power supply on a more modern DC lift