Nord Drivesystems SK 750E-751-323-A - Parameterisation; Control Parameters

7.5 Control parameters
BU 0750 GB Technical design subject to change 89
7.5 Control parameters
This parameter group is only available with the extension unit (option) SK XU1-ENC or SK XU1-POS.
Parameter
Setting value / Description / Note
Parameter
set
Available with option
P300
Servo mode
P
ENC
POS
0...1
[ 0 ]
With this setting speed control and speed measurement via incremental shaft encoder are activated.
This type of control ensures extremely uniform speed behaviour all through the speed range, right
down to complete stopping of the motor.
0 = OFF
1 = ON
Note: For this function to take effect an incremental encoder must be connected (cf.
Section 3.6 Shaft encoder connection) and the correct number of increments
must be entered in parameter P301.
P301
Incremental encoder
ENC
POS
0...17
[ 6 ]
Input of the number of pulses per revolution of the connected incremental shaft encoder.
If the sense of rotation of the shaft encoder does not correspond with the phase sequence ensured
by the FI (due to the way it is installed and wired up) this can be taken into account by selecting the
applicable number of increments with the negative sign 8...16.
0 = 500 increments
1 = 512 increments
2 = 1000 increments
3 = 1024 increments
4 = 2000 increments
5 = 2048 increments
6 = 4096 increments
7 = 5000 increments
8 = -500 increments
9 = -512 increments
10 = -1000 increments
11 = -1024 increments
12 = -2000 increments
13 = -2048 increments
14 = -4096 increments
15 = -5000 increments
16 = -8192 increments
17 = + 8192 increments
P310
Speed Ctrl P
P
ENC
POS
0...3200 %
[ 100 ]
P component of the speed controller (proportional gain).
Gain factor with which the speed difference corresponding to the variance between setpoint and ac-
tual frequency is multiplied. A 100% setting means that a speed difference of 10% will result in a
10% setpoint. If the set values are too high, oscillation of the output speed may occur.
P311
Speed Ctrl I
P
ENC
POS
0...800 % / ms
[ 20 ]
I component of the speed encoder (integral-action component).
Owing to the integral-action component of the controller the control deviation can be completely
eliminated. The setting value refers to the extent of the setpoint variation per ms. If the values set
are too low, the controller will slow down (the reset time value becoming too high).