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ECODRIVE03 SGP-01VRS
Operating Modes
8-41
8.11 Operating mode: velocity synchronization with virtual
master axis
Velocity synchronization is used in printing machines in such cases as
simple transport feeds. The drive runs with velocity synchronous to the
master axis. The track speed at the circumference of the transport feed
or the winder is preset by the electrical gear. A defined tension control
can be set with the fine offset of the gear.
The master axis position is set in this mode by the control.
The structure of the mode is illustrated below:
Velocity
synchronization
Steering axle
position
Velocity
control
Velocity command
value
Fig. 8-39:
Current control
M
Torque/power
command value
Velocity Synchronization with virtual master axis block diagram
Pertinent Parameters
• S-0-0236, Master drive 1 revs.
• S-0-0237, Slave drive 1 revs.
• P-0-0083, Gear ratio fine adjust
• P-0-0053, Master drive position
• P-0-0108, Master drive polarity
• P-0-0156, Master drive gear input revolutions
• P-0-0157, Master drive gear output revolutions
Command Value Preparation for Velocity Synchronization with Virtual
Master Axis
After the slave drive has been synchronized to the master axis position,
the drive generates the "synchronous velocity command value" (This is a
component of the velocity command value which is relayed to the velocity
controller).
The synchronous velocity command value (dXsynch) is selected for the
master drive in terms of the polarity (P-0-0108, Master drive polarity)
and the set scaling type (S-0-0076, Position data scaling type) in
accordance with the following equation:
dXSynch= ± [(P-0-0053(n) - (P-0-0053(n-1 ) )*
dXSynch:
n:
Fig. 8-40:
P-0-0157 S-0-0237
*
*( 1 + P-0-0083 )] + S-0-0037
P-0-0156 S-0-0236
synchronous velocity command value
probe cycle
Generating the synchronous velocity value for rotary scaling
The fine adjustment of the gear ratio that can be configured as cyclical
data permits velocity changes at the slave axis at a constant master axis
speed. Velocity can also be changed by changing the master axis gear
parameter which can also be cyclically changed.
DOK-ECODR3-SGP-01VRS**-FKB1-EN-P