What is the selection criteria of UPS power rating for Rescue operation (Evacuation mode) for Altivar 71 used in Lift Application
UPS power (KVA Rating) requirement depends on the load.
First the mechanical power (Pm) on motor shaft needs to be calculated:
Pm = M x g x v x 100/E
M = Max mass of the load in kilograms (cabin+people+counterweight)
g = gravitational constant 9.81m/sec2
v = Speed of the cabin in meters/sec when Altivar 71 is at evacuation speed
E = Efficiency of the gearbox in %
Considering motor losses and Altivar losses, the estimated UPS power requirement should be approximately 30% more than Pm.