Operating instructions

Setpoint channel and closed-loop control
7.4 Vector speed/torque control with/without encoder
Drive converter cabinet units
Operating Instructions, 10/2008, A5E00288214A
281
Note
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.
Acceleration pre-control 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 Pre-control balancing reference/acceleration model
Parameter
• p0311
Rated motor speed
• r0333
Rated motor torque
• p0341
Motor moment of inertia
• p0342
Ratio between the total and motor moment of inertia
• r0345
Rated motor startup time
• p1400.2
Acceleration pre-control source
• p1428
Speed pre-control balancing dead time
• p1429
Speed pre-control balancing time constant
• p1496
Acceleration pre-control scaling
• r1518
Acceleration torque