Danfoss VLT5000 SyncPos, Operating Instructions Manual

Page: 153 / 236

Programmable SyncPos motion controller
MG.10.J8.02 – VLT is a registered Danfoss trade mark
152
■ ■
■ ■ ■
SYNCM
The SYNCM command functions just like the
SYNCP command by making a angle/position syn-
chronization with the master, but also makes a mar-
ker correction. Thus, during the starting of syn-
chronization the program is synchronized to the next
marker calculated. In this manner it is possible to
compensate for differing running behaviors, for
example slippage.
Once synchronization has been completed, devia-
tion is determined at every marker (or every n-th
marker if the number of markers is not identical for
the master and slave). This is input into the control
as the new offset and the program immediately
attempts to compensate for this. However, in doing
so the values set for velocity, VEL, and acceleration,
ACC or DEC are not exceeded.
Summary
angle/position synchronization with the master with
marker correction
Syntax
SYNCM
Pecularities
In addition to the parameters used by SYNCP,
SYNCREADY (56) and SYNCFAULT (57) are also of
significance.
NB!
Since the following parameters could lead to
overdefinition, it is important to ensure that
these values are logical, match one another and are
consistent with the information on the gear factors.
SYNCMARKM (52) and SYNCMARKS (53)
SYNCMPULSM (58) and SYNCMPULSS (59)
SYNCMTYPM (60) and SYNCMTYPS (61)
NB!
SYNCM should only be called up once since
the synchronizing continues until the next
motion or stop command. All additional SYNCM
commands cause the synchronization to start over
again from the beginning and this is not normally
intended, as you reset the actual SYNCERR.
N EW
When defined in SYNCMSTART (62), the
system waits for the first evaluation of the
marker pulses on starting SYNCM and only then the
offset SYNCPOSOFFS (54) is applied.
Marker signal
The marker can be the zero pulse from the encoder
or an external 24 volt signal
(I5 = master; I6 = slave).
Command group
SYN
Cross Index
parameter of the AXS group
Syntax-Example
SYNCM /* synchronization of the position with
marker correction */
Example
Even when both belts are running synchronously
the lids may not be aligned with the boxes at the
right time. With SYNCM the difference between
master and slave is detected by means of the
external markers and the possible position deviation
is corrected.
Software Reference