Operating instructions

Setpoint channel and closed-loop control
7.4 Vector speed/torque control with/without encoder
Drive converter cabinet units
278 Operating Instructions, 10/2008, A5E00288214A
• p1960
Speed controller optimization selection
7.4.3.1 Examples of speed controller settings
Examples of speed controller settings for vector control with encoders
A number of examples of speed controller settings with vector control without encoders
(p1300 = 20) are provided below. These should not be considered to be generally valid and
must be checked in terms of the control response required.
● Fans (large centrifugal masses) and pumps
Kp (p1470) = 2 … 10
Tn (p1472) = 250 … 500 ms
The Kp = 2 and Tn = 500 ms settings result in asymptotic approximation of the actual
speed to the setpoint speed after a setpoint step change. During many simple control
procedures, this is satisfactory for pumps and fans.
● Stone mills, separators (large centrifugal masses)
Kp (p1470) = 12 … 20
Tn (p1472) = 500 … 1000 ms
● Kneader drives
Kp (p1470) = 10
Tn (p1472) = 200 … 400 ms
Note
We recommend checking the effective speed control gain (r1468) during operation. If this
value changes during operation, Kp adaptation is being used (p1400.5 = 1). Kp
adaptation can, if necessary, be deactivated or its behavior changed.