Lenze DDS Global Drive PLC Developer Studio Instrukcja Użytkownika Pobierz pdf (Strona 17)

Function block library LenzeElectricalShaft.lib

Special functions

2.1.1 Digital frequency ramp generator (L_DFRFG)

2−7

LenzeElectricalShaft.lib EN 1.2

Setting the initial values of L_DFRFG1 in the Instance−Parameter Manager

· Alter the initial value of byFunction from 0 to 1.

The start of synchronization is then initiated throught the Touchprobe input (X5/E5) of the SB

DF_IN_DigitalFrequency ( L_DFRFG.bSetTPReceived_b).

DFIN_dnIncLastScan_p assigns the phase difference between the appearance of the

Touchprobe signal and the start of the task in which L_DFRFG1 is called, for the calculation of

the path, to L_DFRFG1 .

· Alter the initial value of dwTir from 1.000 to 10.000, so that the ramp−up/ramp−down time of

the ramp generator is 10 seconds.

· The initial value of bySpeedDirection includes the Lenze standard setting (DF=1), since both

cw (right) and ccw (left) rotation should be possible.

· The initial value of nMaxSpeed includes the Lenze standard setting (DF=3000), so the

maximum speed of the profile generator will be 3000 rpm. (17476 º 16000 rpm)

Speed setpoint

· L_DFRFG1 assigns the speed setpoint, through L_DFSET1 ( nSetSpeedOut_a ) to the SB

MCTRL_MotorControl ( MCTRL_nNSet_a).

· In L_DFSET1 a conversion is made from a velocity valuer (L_DFRFG1.nOut_v) to an analog

value ( L_DFSET1.nSetSpeedOut_a):

<Variable>_v: 16384 º 15000 rpm

<Variable>_a: 16384 º n

max

(C0011)

· During synchronization, the speed setpoint is generated by the synchronization profile (profile

generator) and output to L_DFRFG1.nOut_v (16384 º 15000 rpm).

· After synchronization, the speed setpoint is switched over from L_DFRFG1.nIn_v to

L_DFRFG1.nOut_v , the setpoint now follows the value of the digital frequency input.

Setpoint for the phase−angle controller

A set/actual phase−angle comparison provides an phase−angle difference that is assigned to the

phase−angle controller in the SB MCTRL_ MotorControl. If there is a difference between the set

value and the actual value, the phase−angle controller corrects this deviation.

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

MCTRL_bPosOn_b = TRUE)

· The set/actual value comparison is performed in L_DFSET1 between L_DFSET1.nSet_v

(setpoint) and L_DFSET1.nNAct_v (actual value).

· The phase−angle difference is output via L_DFSET1.dnPosDiffOut_p, and then assigned to the

phase−angle controller in the SB MCTRL_ MotorControl through the system variable

MCTRL_dnPosSet_p.

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Lenze DDS Global Drive PLC Developer Studio Instrukcja Użytkownika Strona 17