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Function library LenzeDrive.lib

Analog signal processing

2.2.8 Comparison (L_CMP)

2−15

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

) for

one direction of rotation.

bOut_b

nIn1_anIn2_a

nHysteresis

nIn2_a

nHysteresis

nIn1_a

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"

act

< n

) for one direction of rotation.

bOut_b

nIn1_a

nIn2_a

nHysteresis

nIn2_a

nHysteresis

nIn1_a

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.

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