Function library
7-66
L
EDSVS9332P-D21 EN 3.0
7.5.9.8 Virtual master (output POS-PHI-SET)
POS-SETPOS
C1221/2
POS-VSET
C1245/1
POS-ASET
C1255/1
POS-NSET
C1220/2
POS-PHI-SET
Speed profiler
(Virtual master function)
(Values following the profile)
POS
9300POS038
Purpose
•
Phase and speed synchronous traversing of two or several drives.
Function
•
Definition of “virtual master”:
Viatherequiredphasedifferenceoutput(POS-PHI-SET)ofthemasterdrivethemasterdrive
itself and the ”slave” drives are positioned in parallel.
This does not lead to any reactions between the drives and no offset in positioning occurs in
contrast to connecting the slave drives via the actual phase difference output
(MCTRL-PHI-ACT).
•
POS-PHI-SET is transmitted to the slave drives through digital frequency connection (DFOUT,
DFIN, DFSET).
•
A connection via system bus (CAN) is possible.
– Advantage of clocked drives:
For improving the dynamic features a speed precontrol can be transmitted in addition.
Tip!
With system bus coupling (CAN) the controllers must be synchronised, otherwise position
information may get lost. The synchronisation is realised in the slave drives via the SYNC function
block. In the master drive the ”CAN-Sync telegram” must be generated.
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