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2 Weird things I have noticed with modern VF lifts

Increasing delays with increasing load

Almost every time I have filmed a VF lift since 2016, I have noticed that the more crowded a lift was, the more time it took for it to start moving after the doors closed. Not only that, but I have noticed something nerve wracking with how the lifts behaved when they were crowded. They would either slowly sink for a couple of inches before accelerating upward or slowly rise for a couple of inches before accelerating downward. Since this behavior is fairly new to me since I am still getting used to how VF lifts work, it is actually quite scary for me to experience when filming the lift. So far, I have been on a ThyssenKrupp Momentum, a standard VF ThyssenKrupp & a few OTIS Elevonic 411 lifts which have done that to me on camera. 

Although I have been on a few Schindler 7000s (all destination dispatch) which did that, I haven't watched enough videos of Schindler Miconic 10's / PORT's to know if it's normal or not for a lift to have such long delays when it has many occupants going to many different floors.

Variable intelligent leveling

There is no secret that most VF lifts have intelligent leveling whether they are MRL or not. Some EcoDiscs have semi-intelligent leveling, most OTIS lifts have full or semi-intelligent leveling (which varies from time to time) & ThyssenKrupps mostly do not have intelligent leveling.

For example, I could take into account the time I was at the Borgata hotel in Atlantic City & I was riding the lifts for the third day in a row. When the lift stopped decelerating, I noticed it was leveling eerily slowly with the next floor & it took a few seconds longer for the doors to open at my floor. This has led me to learn something valuable about OTIS Elevonic 411 high rise lifts. If you frequently transport lots of occupants at once to many different floors, the motor could heat up & begin not performing as good as when the lift is dealing with mostly lighter loads (as in 1 or 2 people). It turns out that on YouTube, I have seen at least one video of people getting stuck in generally crowded OTIS, ThyssenKrupp & Schindler VF lifts which weren't crowded at the time they got stuck. 

Is VF a safe choice to go?

With VF motors, it is even less likely the lift will break down because the motors run at a variable frequency, not at a constant frequency like the DC & AC powered lifts. VF probably gives the lift more ability to adjust to heavier loads in more appropriate fashions leading to less breakdowns. This does not mean I still entirely trust VF lifts. I prefer to go with standard AC & DC lifts they used back in the day because they run the same way no matter how heavy or light the load is.

Of course, I do not know everything about VF drives, so always refer to a more experienced lift filmer or lift mechanic for more accurate advice about VF motor behavior.
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