Danfoss VLT 5000 Series Manual page 114

I I I I I SYNCV
With SYNCV a velocity synchronization with the
master is completed. In doing so only the velocity
is taken into consideration and the controller does
not attempt to recover the position.
V
Master velocity
Slave velocity
synchronization command
For synchronization and during the synchronization
process neither the pre-set velocity, VEL, nor the
pre-set acceleration, ACC or DEC, are exceeded.
The parameters of the gear factors used for syn-
chronization are: SYNCFACTM (49), SYNCFACTS
(50).
Furthermore, the speeds are not simply determi-
ned on the basis of the difference between the
current position minus the last position (master/
slave), rather the values are filtered according to
the settings in SYNCVFTIME (65). This means the
filter for the slave is determined by the maximum
speed.
In other words:
VELMAX * 5 corresponds to the encoder resolution
for the filter table, where VELMAX is the speed in
qc/ms. (The formula is a result of the assumption
that the filter table for the encoder resolution was
made with a maximum speed of 3000 Rpm.)
During the transition from the speed controller to
the position controller this is done as smoothly as
possible. In addition the new set position is defi-
ned in such a manner that the following is true:
command_pos = actual_pos + error
old_error, cvel, avel are maintained. Sumerr is also
accepted unchanged.
Summary
velocity synchronization with the master
Syntax
SYNCV
114
VLT ® 5000 SyncPos option
NB!
SYNCV should only be called up once since
the synchronizing continues until the next
motion or stop command. All additional SYNCV
commands cause the synchronization to start over
again from the beginning and this is not normally
intended, as you reset the actual SYNCERR.
Command group
SYN
Cross Index
parameter of the AXS group
t
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