PCI-1243U User Manual
38
A ramping-down point is set based on the number of pulses output during
ramping-down. Therefore the area marked by oblique lines in the chart
below is the number of pulses to be calculated. FL and FH are the output
pulse frequencies.
Figure 4.4: Pulse Calculation
T
SD
[sec], the time required for the deceleration is:
T
SD
= [(R2)-(R1)] x (R3) x Multiplier / (CLOCK) (1)
where CLOCK = 4.9152 MHz
The relationship between the set value on speed register (Rf) and output
frequency (F [PPS]) is
F = (Rf) x (CLOCK)/ [8192 x (R4)] (2)
Therefore, FL output frequency FL [PPS] and FH output frequency FH
[PPS] are
FL = (R1) x (CLOCK)/ [8192 x (R4)] (3)
FH = (R2) x (CLOCK)/ [8192 x (R4)] (4)
Note
Multiplier = 1 while in Linear Accel/Decel mode
Multiplier = 2 while in S-curve Accel/Decel mode
FH
FL
A
B
C
D
E
F
t
Ts
d
PPS
Summary of Contents for PCI-1243U
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