Lenze DDS Function library Drive - Manual (Page 25)

Function library LenzeDrive.lib
Analog signal processing
2.2.8 Comparison (L_CMP)
2−15
L
LenzeDrive.lib EN 1.7
2.2.8.2 Function 2: nIn1_a > nIn2_a
·
Selection: byFunction = 2
·
With this function, you can make the comparison "actual speed is above a limit" (n
act
> n
x
) for
one direction of rotation.
bOut_b
nIn1_a nIn2_a
1
0
nHysteresis
nIn2_a
nHysteresis
t
nIn1_a
t
bOut_b
Fig. 2−13 Signal values exceeded (nIn1_a > nIn2_a)
Functional sequence
1. If the value at nIn1_a is below the value at nIn2_a, then bOut_b changes from FALSE to TRUE.
2. Only when the signal at nIn1_a is above the value of nIn2_a − nHysteresis again, will bOut_b
change from TRUE to FALSE.
2.2.8.3 Function 3: nIn1_a < nIn2_a
·
Selection: byFunction = 3
·
With this function, for instance, you can make the comparison "actual speed is below a limit"
(n
act
< n
x
) for one direction of rotation.
bOut_b
nIn1_a nIn2_a
1
0
nHysteresis
nIn2_a
nHysteresis
t
nIn1_a
t
bOutb_b
Fig. 2−14 Gone below signal values (nIn1_a < nIn2_a)
Functional sequence
1. If the value at nIn1_a is below the value at nIn2_a, then bOut_b changes from FALSE to TRUE.
2. Only when the signal at nIn1_a is above the value of nIn2_a − nHysteresis again, will bOut_b
change from TRUE to FALSE.