Lenze DDS Global Drive PLC Developer Studio Uživatelský manuál stáhnout pdf (Strana 24)

Function block library LenzeElectricalShaft.lib

Special functions

2.1.2 Digital frequency processing (L_DFSET)

2−14

LenzeElectricalShaft.lib EN 1.2

A TouchProbe or zero−pulse has occurred:

If a TouchProbe or zero−pulse has appeared at terminal X5/E4 or X5/E5, then the instance of L_DFSET

receives this information through

· bSetTPReceived_b (setpoint of the SB DF_IN_DigitalFrequency)

and

· bActTPReceived_b (actual value of the SB MCTRL_MotorControl)

the next time that the task is called in which the instance of L_DFSET is processed.

The phase−angle difference between the appearance of the TouchProbe/zero−pulse signal and the

start of this task is assigned to dnActTPLastScan_p and dnSetTPLastScan_p respectively.

The synchronization can be made to be precisely in phase, with the help of this information.

If the synchronization has been successfully concluded, then L_DFSET1.bAck_b is set to TRUE.

Synchronization mode

For the synchronization, different modes are available. The setting is made through by0PulsFunc .

by0PulsFunc Synchronization mode Note

0 inactive function inactive

1 continuous synchronization with correction in the shortest

possible way

The synchronization starts after 2 zero−pulses are received.

2 single synchronization with correction in the shortest possible

way

Set b0Pulse_b = TRUE for a single zero−pulse synchronization.

The synchronization starts after 2 zero−pulses are received.

10 single synchronization, a phase deviation is corrected in the

shortest possible way

11 single synchronization, a phase deviation is corrected in CW

direction

12 single synchronization, a phase deviation is corrected in CCW

direction

13 single synchronization, a phase difference is determined

between setpoint pulse and actual pulse and is corrected to

the corresponding direction of rotation according to the sign

Set b0Pulse_b = TRUE for a single zero−pulse synchronization.

2.1.2.4 Calculation of a phase−angle difference

With the aid of a set/actual phase−angle comparison, a phase−angle difference can be determined,

and corrected.

set position

actual value

nNAct_v

nSet_v

dnPosDiffOut_p

MCTRL_dnPosSet_p

MCTRL_nNAct_v

DFIN_nIn_v

Abb. 2−8 Example of phase−angle difference determination for the 9300 Servo PLC, with L_DFSET

· In nSet_v (16384 º 15000 rpm) the setpoint speed is read in, and integrated into a path

information by an integrator in L_DFSET. The processing time for the task, during which the

instance of L_DFSET is called, is taken into account.

· The stretch and gearing factors, as well as offsets, can also be taken into account in the

calculation of the setpoint speed.

· In nNAct_v (16384 º 15000 rpm) the actual speed is read in, and integrated into a path

information by an integrator in L_DFSET. The processing time for the task, during which the

instance of L_DFSET is called, is taken into account.

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