Lenze DDS Function library Drive Manual de usuario descargar pdf (Pagina 82)

2.7.3 Motor potentiometer (L_MPOT)

Function library LenzeDrive.lib

Special functions

2−72

LenzeDrive.lib EN 1.7

Activation of the motor potentiometer

 If bInAct_b = FALSE, then the motor potentiometer is activated. The function that is now

performed depends on

– the momentary output signal.

– the preset limit values.

– the control signals at bUp_b and bDown_b.

 If the signal at nOut_a

– is outside the limits that have been set, then the output signal moves to the nearest limit,

using the T

times that have been set. The sequence is independent of the control signals at

bUp_b and bDown_b.

– within the limits that have been set, then the output signal moves according to the control

signals at bUp_b and bDown_b.

2.7.3.2 Initialization of the motor potentiometer

On initialization after power−on, the motor potentiometer is loaded with a specific initial value. Under

byInitFunction you can select the initialization function.

byInitFunction Function

0 The output value that is output on power−off, is stored in the internal non−volatile memory of the drive controller. This

value is loaded in again at power−on.

1 On mains power−on the lower limit (defined by nLowLimit) is loaded.

2 On mains power−on an initial value = 0 % is loaded.

2.7.3.3 Storing the current output value after supply interruption

L_MPOT

nOut_a

bUp_b

bDown_b

byInitFunction

byFunction

bInAct_b

dnActRetain

CTRL

nHighLimit

wTir

wTif

nLowLimit

dnActRetain

[VAR_GLOBAL RETAIN] [VAR_GLOBAL RETAIN]

Fig. 2−72 Programming to store the current output value after a supply interruption

In order to store the latest value at nOut_a after a supply interruption, you must declare a global

variable of type RETAIN (VAR_GLOBAL RETAIN). Combine the variable as described in Fig. 2−72.

 The current value at nOut_a is always stored in this variable. The variable will hold the value

after a supply interruption.

 When the power is switched on again, the stored value is read into the FB L_MPOT from the

variable and applied as the starting value.

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