Lenze DDS Global Drive PLC Developer Studio - Manual (Page 24)

Function block library LenzeElectricalShaft.lib
Special functions
2.1.2 Digital frequency processing (L_DFSET)
2−14
L
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.