Lenze DDS Function library Drive Manual do Utilizador descarregar pdf (Página 24)

2.2.8 Comparison (L_CMP)

Function library LenzeDrive.lib

Analog signal processing

2−14

LenzeDrive.lib EN 1.7

2.2.8.1 Function 1: nIn1_a = nIn2_a

 Selection: byFunction = 1

 This function compares two signals for equality. For instance, you can make the V comparison

"actual speed is equal to set speed" (n

act

= n

set

 The exact function can be seen in the diagram. (^Fig. 2−12)

nWindow

nIn2_a

nIn1_a

nHysteresis

nIn2_a

nHysteresis

nWindow

nHysteresis

nWindow

nIn1_a

bOut_b

Fig. 2−12 Equality of signals (nIn1_a = nIn2_a)

 Use nWindow to set the window within which the equality is valid.

 Use nHysteresis to set a hysteresis, if the input signals are not stable and the output oscillates.

Note!

With this function, you must use the FB in a fast task, to achieve optimum sampling of the signals.

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Lenze DDS Function library Drive Manual do Utilizador Página 24