User`s manual

apfiff09 marine vacon • 187
24-
6
7.11.2 Master Follower: DriveSynch system
DriveSynch is used to control parallel drives. Up to four drives can be connected parallelly. The
motor can be a single winding motor or there can be several winding motors.
Vacon DriveSynch works in open loop and closed loop motor control modes. With closed loop motor
control, the encoder feedback needs to be wired only to the master drive. If case redundancy is
required, it may be necessary to wire the encoder feedback also to follower drives using the double
encoder option board OPTA7.
Note!
The maximum switching frequency for the drives using Vacon DriveSynch is 3.6 kHz.
Minimum recommended switching frequency in Open Loop control is 1.7 kHz.
Minimum recommended switching frequency in Closed Loop control is 2.5 kHz.
Note!
The NXP control board must be VB00761 (NXP3) or newer.
OPT-D2 boards needs to VB276J or newer.
Master needs to be #1 and cannot be changed.
M
NXP
NXP
OPTD2 OPTD2
NXP
OPTD2
NXP
OPTD2
Optical bus
Mains supply
X5 : TX1
X6 : ON
X5 : TX2
X6 : ON
X5 : TX2
X6 : ON
X5 : TX2
X6 : ON
M
Y Y
NXP
OPTD2
NXP
OPTD2
Mains supply
X5 : TX1
X6 : ON
X5 : TX2
X6 : ON
Multiple winding motor
7.11.2.1 Redundancy
The units working in parallel with Vacon DriveSynch have a high level of redundancy. The system
keeps running without interruption even if any of the follower units is non-functional. In case of a
hardware failure, the failed unit need be isolated before the system can be restarted.
The actual level of redundancy, however, needs to be carefully defined considering the motor, load
and the requirements of the process.
The master drive unit and the fast drive to drive optical communication has to be functional for the
Vacon DriveSynch functionality. The auxiliary power (+24V) must be continuously provided for all the
control units including the non-functional drive units in Vacon drive synch system.
It is also a common practice to use (n+1) units, where n is the number of required units for full
functionality of the system. In this case, the system is fully operational even if any follower is non-
functional.