Siemens SIMATIC S5 Manual page 104

Application Examples
Moment of inertia
J
[kg cm 2 ]
7.5
6.25
5.0
3.75
2.5
1.25
0
Figure 6-6. Example of Moment of Inertia as a Function of f
A start/stop rate of f
ss
therefore applies:
320 Hz
The value calculated for SS is coded with bits 0 to 7 of byte 0 of the configuration
message frame and written into QB 88 of the PIQ ( Table 6-2.).
The following applies for this example: QB 88 = 00001000 = 08
6-28
500 1000 1500 2000
60 120 180 240
= 320 Hz was selected for this example. The following
f = BV SS *
*
ss
= 40 SS *
*
SS = 8
Hz
2500
Revs/min
300
SS
R
1
H
EWA 4NEB 812 6061-02a
IP 267