Rainbow Electronics ATA6830 - Manual (Page 12)

12
ATA6830
4575B–BCD–01/03
Figure 11. Cruise Control
In addition to the actual step frequency there is a maximum step frequency up to which
the actual step frequency can rise. To secure a correct operation at low supply voltages
the maximum value for the stepping frequency is smaller at low voltages. If the supply
voltage falls below the 9 V threshold, travel operation will suspend. To restart operation,
the supply voltage has to rise above 10.5 V. The relation of the maximum step fre-
quency and the supply voltage during operation is shown in Table 4.
Table 3. Frequency Ramp
Number Step Frequency (Hz) Step Time (µs)
1 303 3300
2 345 2895
3 394 2540
4 446 2240
5 493 2030
6 583 1860
7 575 1740
8 673 1630
9 649 1540
10 680 1470
11 714 1400
12 741 1350
13 769 1300
14 800 1250
15 826 1210
16 855 1170
17 877 1140
18 901 1110
19 926 1080
20 952 1050
21 980 1020
22 1000 1000
frequency
present position nominal
position
time t+1
nominal
positon
time t
present
frequency
minimum
frequency
(300 Hz) position