Lenze i550

10.4.8 Torque limitaon seng
Intro
For torque limitaon in VFC mode, a maximum torque can be set for the inverter. If the motor
torque exceeds the torque limit, the inverter modies the output frequency to counteract this
exceedance.
The quality of the torque limitaon depends on the accuracy of the actual tor-
que calculaon.
Precondions
The VFC torque limiter is only eecve for the following motor control types:
•
V/f control (open loop)
•
V/f control (closed loop)
In order to achieve good performance, it is recommended that the motor/inverter rst be
idened!
4Opons for opmising the control loops ^ 213
Details
The VFC torque limiter becomes acve in V/f operaon when the current motor torque
exceeds the maximum torque. The limiter modies the output frequency to counteract the
exceedance.
The VFC torque limitaon funcons in a manner similar to the VFC Imax controller, but instead
of the total current, the actual torque is taken into account.
When the maximum torque is exceeded:
•
During motor operaon, the VFC torque limiter reduces the output frequency.
•
During generator operaon, the VFC torque limiter increases the output frequency.
4Conguring the torque control ^ 149
Parameter
Address Name / seng range / [default seng] Info
0x2B10:001 V/f torque limitaon: Gain
0.00 ... [0.00] ... 655.35 %
Gain of the torque limitaon.
•
0%: torque limitaon is deacvated (standard seng)
•
100%: same dynamic behaviour as the Imax controller (recommended
seng for VFC torque acvaon)
Conguring the motor control
V/f characterisc control for asynchronous motor (VFC open loop)
Torque limitaon seng
187