WEG CFW-11 Applications Manual page 39

Parameters Description
Figure 3.1 – Lightweight detection operation mode
Description of the identified moments:
1 – The load forward command is given through the digital input DI1. The motor becomes magnetized, and
voltage and frequency are applied to it
2 – The motor is accelerated to the speed reference 1 value set in P1031.
3 – The speed reference 2, programmed in P1032, is selected through the digital input DI4 and the load is then
accelerated to that speed. Note that the motor current remains below the lightweight threshold set in P1038.
4 – At that moment, the motor frequency crosses the speed threshold for lightweight detection adjusted in
P1039 and because the motor current remains below the current threshold set in P1038, lightweight, generating
the alarm A750, is detected. The motor is then accelerated up to the maximum speed adjusted in P0134.
5 – The motor reaches the programmed maximum speed.
6 – The load forward command is removed from the digital input DI1 (and consequential removal of the
selection done via the digital input DI4). The motor deceleration begins.
7 – The motor reaches 0 rpm and remains magnetized (If within the period programmed in P1027 a new load
forward or reverse command does not occur, the motor will be demagnetized).
Crane Horizontal Motion | 39