Lenze DDS Global Drive PLC Developer Studio Manuel d'utilisateur télécharger pdf (Page 34)

Function block library LenzeElectricalShaft.lib

Special functions

2.1.4 Homing function (L_REF)

2−24

LenzeElectricalShaft.lib EN 1.2

Direct homing

The home position is on the home position offset.

· Mode 20 ( byHomingMode = 20):

– The drive moves immediately after activation ( bOn_b = TRUE) from the present position to

the reference point.

– You can load the actual position value before, with the input value dnActPosIn_p

(^ 2−24)

– The distance and direction results from the actual position and the set reference point offset.

dnRefOffset .

0 = M C T R L _ d n P o s _ p

L _ R E F . d n A c t P o s _ I n _ p

L _ R E F . d n R e f O f f s e t

Abb. 2−18 Direct homing; move to the home position in CW rotation

 Distance

 Start position

 Direction

 Home position

· Mode 21 ( byHomingMode = 21), as mode 20, but also:

– The actual position is saved during power disconnection, and is loaded again at power−on

(set C2104 = 1).

Note!

One turn = 2

2.1.4.3 Control via input signals

· bOn_b = FALSE−TRUE edge starts the homing:

– The input must remain TRUE until homing is completed. Homing is canceled if the input is

set to LOW before the reference point is reached. bOn_b is set = FALSE.

· bOn_b = FALSE interrupts the homing:

– The drive is decelerated to zero speed along the preset ramp. dwTiTimeHoming

– The inputs nNIn_a and dnPosIn_p are connected through to the outputs nNSet_a and

dnPosOut_p

– The state has no effect if homing is already completed ( bBusy_b = FALSE).

· bPosLoad_b = FALSE−TRUE edge:

– The profile generator accepts the phase applied at input dnActPosIn_p as a start value for

the actual position value.

– The function is effective only if bOn_b is set = FALSE

– The function is effective only in modes 20 and 21.

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Lenze DDS Global Drive PLC Developer Studio Manuel d'utilisateur Page 34