Speed Reference Scaling - ABB ACL30 User Manual

142 Program features
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Speed reference scaling

The Speed reference scaling function converts the linear speed of the elevator (m/s)
to the rotation speed of the elevator motor (rpm). To ensure correct operation of the
function and the elevator, you must define calculation factors at the start-up of the
drive. These factors (parameters) are: gear ratio, sheave diameter and roping ratio.
The figure below illustrates the components of the function.
Sheave dia (m)
Sheave diameter (mm)
The figure below illustrates common roping ratio alternatives.
Motor
Motor
Roping ratio 1:1
Roping ratio 1:1
Speed
Speed (rpm)
(rpm)
Gear ratio
Gear ratio
Linear speed (m/s)
Linear speed (m/s)
Roping ratio 2:1
Roping ratio 2:1