Danfoss VLT 5000 Series Manual page 111

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 devia-
tion is corrected.
MG.10.J4.02 – VLT is a registered Danfoss trade mark
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VLT 5000 SyncPos option
I I I I I SYNCP
The SYNCP command completes an angle/
position synchronization with the master. In doing
so the position according to the gear factors to the
master is kept synchronous, that means after an
external disturbance the program subsequently
tries to recover the corresponding stretch. However,
in doing so the values set for velocity, VEL, and
acceleration, ACC or DEC are not exceeded.
The following parameters affect the behavior:
SYNCFACTM (49), SYNCFACTS (50)
SYNCPOSOFFS (54)
SYNCACCURACY (55)
REVERS (63)
During synchronization the program proceeds as
follows:
When the SYNCP command is started, the actual
master position is determined and is retained.
From the master velocity, and in consideration of
the acceleration allowed, the necessary slave velo-
city is calculated in order to reach the master
position. The slave is accelerated so long until the
calculated position has been reached or until it is
close enough to the reference position to reach it.
V
Master Velocity
Slave Velocity
Synchronization command
Summary
angle/position synchronization with the master
Syntax
SYNCP
NB!
As soon as the deviation between the
position of the slave and master is less than
SYNCACCURACY (55), the ACCURACY flag is set.
If REVERS (63) is set so that it is not possible to
drive in reverse, but for some reason the slave is
further than the master (e.g. because only the master
has moved in reverse) then the slave will wait at
velocity 0.
gear factors
position offset
accuracy for flag
reverse behavior
t
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