Function library
Function blocks
3.5.29 Digital frequency ramp function generator (DFRFG)
3−176
l
EDSVS9332P−EXT DE 2.0
3.5.29.7 Correction of the touch probe initiator (terminal X5/E5)
Delay times during the activation of the initiator cause a speed−dependent phase offset (e.g. during
positioning, synchronising).
In order to take this angular offset into account, the response time [ms] of the initiators as a function
of the setpoint speed DFRFG−IN is converted to a phase angle correction and is then taken into
consideration in the setpoint angle. For this, the response time [ms] has to be converted to a
correction value [Inc.] first.
l Set correction value for the phase offset under C0429.
l Formula for input value in C0429:
Input value C0429 = 16384 × response time [ms]
l
The response time [ms] can be gathered from the data sheet of the initiator or requested by
the manufacturer.
3.5.29.8 Offset setting
The offset can be set with code C0756. The offset refers to the digital frequency input and is scaled
to 1 revolution (¢65536 increments).
The touch probe (TP) initiates the start of the ramp function generator. The leading of the master drive
from the moment of starting or the resulting path/phase difference is taken up during the acceleration
phase.
l Setting: positive offset values
– Causes a time shift of the TP
– This means that less time is necessary − compared to the setting with e.g. offset = 0 − to
obtain synchronism with the master drive.
Tip!
With high offsets and low input speeds the drive may reverse. To avoid this, a direction of rotation
can be selected for the output via C0766.
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