Motor Power Company DUET_FL 48/10, User Manual

Page: 60 / 196

Page 60
The ramps can be configured separately for right-handed and left-handed rotation as well as for rising
and falling speeds.
If the ramp accelerations are partly identical, you can reduce your input workload by selecting the
check boxes [r3 = r1], [r4 = r2] or [r2 = r3 = r4 = r1].
The ramp generator should be used if the controller is in speed-controlled mode and no
position control is active (also not in an external control). Configure the ramps such that
the drive will not be controlled into the current limitation during acceleration under realistic
load conditions.
When the setpoint ramp is configured correctly, overshoots of the speed controller when
running into the speed setpoint can be reduced considerably compared to the operation
without a setpoint ramp.
The setpoint ramp must not be activated in the case of application with a position control
system (either internal or through the external control) as from a control point of view the
ramp operates like a PT
1
filter and decreases the stability in the control circuit.
Torque limitation
As mentioned before, a torque limitation can be parametrized in the speed control operating mode. In
this case, the selected setpoint source specifies a certain maximum torque. This maximum torque then
limits the setpoint symmetrically for the current controller or the torque controller.
Please keep in mind that the current setpoint is also limited by the values set in the motor data menu
for the rated current and the maximum current. The current setpoint is limited to the lowest torque limit.
Application requiring torque control in a quadrant, i.e. the adjustment of the torque from
zero to maximum in one direction of rotation, can be realized well in most cases in the
speed control mode with torque limitation:
•
The torque setpoint is assigned through the torque limitation
•
The speed setpoint is assigned through a separate setpoint. This prevents the drives
from "spinning" under no-load conditions and the speed will be limited to non-
dangerous values.
User Manual DUET_FL „DUET_FL 48/10“ Version 1.1 Motor Power Company