Lenze DDS Global Drive PLC Developer Studio - Manual (Page 34)

Function block library LenzeElectricalShaft.lib
Special functions
2.1.4 Homing function (L_REF)
2−24
L
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
R S
Q
L _ R E F . d n R e f O f f s e t
T
Q
Abb. 2−18 Direct homing; move to the home position in CW rotation
 Distance
‚ Start position
ƒ 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 16
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.