Lenze DDS Global Drive PLC Developer Studio Manual do Utilizador descarregar pdf (Página 39)

Function block library LenzeElectricalShaft.lib

Special functions

2.1.4 Homing function (L_REF)

2−29

LenzeElectricalShaft.lib EN 1.2

Setting the initial values of L_REF1 in the Instance−Parameter Manager

· Alter the initial value of dnHomingSpeed (maximum traversing speed) to

1000 rpm (286331153 corresponds to 16000 rpm).

· The initial value of byHomingMode keeps the Lenze standard setting

(0 = move to the home position in CW rotation.

· The initial value of wTiTimeHoming keeps the Lenze standard setting

(100 = 1 second ramp up/down time).

Function:

Note!

The phase−angle controller in the SB MCTRL_MotorControl must be activated.

( MCTRL_bPosOn_b = TRUE).

· The homing mode is started via DIGIN_bIn1_b.

· The speed setpoint is calculated by the ramp generator, and given out by L_REF1.nNset_a

· The ramp−up (acceleration)is made in accordance with the ramp−up time

(L_REF1.wTiTimeHoming) and the traversing speed that has been set for homing

(L_REF1.dnHomingSpeed).

· After 2 seconds, the marker (L_REF1.bMark_b) is set to FALSE by L_REF1.

Now, a TouchProbe signal can be set by L_REF1.bActTPReceived_b .

· The TouchProbe is triggered via the digital input X5/E4 (TouchProbe of the SB

MCTRL_MotorControl).

· MCTRL_dnActIncLastScan assigns the phase difference between the appearance of the

Touchprobe signal and the start of the task in which L_REF1 is processed to L_REF1 for the

calculation of the path.

· During homing, the phase−angle difference between the setpoint (ramp generator) and the

actual value (L_REF1.nNAct_v) is calculated.

· The phase−angle difference is output via L_REF1.dnPosOut_p , and then assigned to the

phase−angle controller in the SB MCTRL_MotorControl through the system variable

MCTRL_dnPosSet_p .

· After homing, L_DFSET1 calculates the phase−angle difference, and assigns the value to

L_REF1.dnPosIn_p .

The value is switched from L_REF1.dnPosIn_p through to L_REF1.dnPosOut_p.

· The setpoint/actual−value comparison is calculated in L_DFSET1 from L_DFSET1.nSet_v

(setpoint) and L_DFSET1.nNAct_v (actual value) and given out via L_DFSET1.dnPosDiffOut_p

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Lenze DDS Global Drive PLC Developer Studio Manual do Utilizador Página 39