Danfoss VLT 5000 Series Manual page 110

I I I I I SYNCERR
SYNCERR returns the actual synchronization error
in User Units. This is the distance between the
actual master position (converted with drive factor
and offset) and the actual position of the slave.
If the parameter SYNCACCURACY (55) is defined
by a minus sign, you can also determine whether
the synchronization is running ahead (negative
result) or running behind (positive result).
Summary
Queries actual synchronization error of the slave.
Syntax
res = SYNCERR
Return value
res = actual synchronization error of the slave in
UU and
a) as an absolute value when the value of
the accuracy window is defined with a
plus sign in the parameter
SYNCACCURACY;
b) with polarity sign when in
SYNCACCURACY the value of the
window is defined with a minus sign.
NB!
SYNCERR only functions in synchronization
mode. As soon as you exit SYNCM or
SYNCP, the pulses are no longer counted.
SYNCERR is only up-dated within a SYNC
command.
Command group
I/O
Cross Index
TRACKERR, MAPOS, APOS,
SYNCPOSOFFS (54), SYNCMFACTM (49),
SYNCMFACTS (50), SYNCACCURACY (55)
Syntax-Example
PRINT SYNCERR
/* query actual synchronization error of the slave */
110
VLT ® 5000 SyncPos option
I I I I I SYNCM
The SYNCM command functions just like the
SYNCP command by making a angle/position syn-
chronization with the master, but also makes a
marker correction. Thus, during the starting of syn-
chronization the program is synchronized to the
next marker calculated. In this manner it is pos-
sible to compensate for differing running beha-
viors, 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 accelera-
tion, 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.
NEW
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.
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