Inovance MD500 Series - Master and Slave Control

6. Description of Parameters
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6.8.6 Master and Slave Control
The master and slave control is designed for multi-drive application, where system is driven by
multiple AC drives and motor shafts are coupled by gear, chain or conveyor belt.
The load is averagely allocated to AC drives in master and slave control. The external
control signal need be connected to the master only, and the master controls the slaves via
communication.
The master must be in speed control and the slaves follow the torque or speed reference of the
master.
● When motor shafts are connected rigidly by chain or gear, the slaves must work in torque
control to remove speed difference amongst drives.
● When motor shafts are connected exibly, the slaves must work in speed control because
slight speed difference amongst AC drives is allowed.
When master and slaves are in speed control, droop rate must be used.
Figure 6-55 Rigid/Flexible connection of the master and slave
n
3
2
2
3
3
3
External control signal
Main power
Monitoring of
the slave faults
Main power
Master and
slave connection
n
3
2
2
3
3
3
External control signal
Main power
Monitoring of
the slave faults
Main power
Master and
slave connection
Rigid connection of the master and slave
• The master is in speed control.
• The slave follows the torque reference of the master.
Flexible connection of the master and slave
The master is in speed control.
The slave follows the speed reference of the master.
CAUTION
To avoid control conict, please:
● Connect all the external control signals to the master only.
● Do not use the operating panel or the eld bus to control the slave .