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If these supplementary conditions are in line with the application, the starting time can be
used as the lowest value for the ramp-up or ramp-down time.
Note
Setting the ramp-function generator
The ramp-up and ramp-down times (p1120; p1121) of the ramp-function generator in the
setpoint channel should be set accordingly so that the motor speed can track the setpoint
during acceleration and braking. This will optimize the function of speed controller pre-
control.
The acceleration precontrol using a connector input (p1495) is activated by the parameter
settings p1400.2 = 1 and p1400.3 = 0. p1428 (dead time) and p1429 (time constant) can be
set for balancing purposes.
Function diagram
FP 6031
Parameters
• p0311
• r0333
• p0341
• p0342
• r0345
• p1400.2
• p1428
• p1429
• p1496
• r1518
Enclosed Drives
Operating Instructions, 12/2018, A5E36652151A
7.4 Vector speed/torque control with/without an encoder
Precontrol balancing reference/acceleration model
Rated motor speed
Rated motor torque
Motor moment of inertia
Ratio between the total and motor moment of inertia
Rated motor startup time
Acceleration pre-control source
Speed pre-control balancing dead time
Speed pre-control balancing time constant
Acceleration pre-control scaling
Acceleration torque
Setpoint channel and closed-loop control
473
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