Goodrive3000 series medium voltage VFD
Debugging of master/slave control
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Appendix A Debugging of master/slave
control
A.1 Wiring of master/slave control
GD3000
1#
Input reactor
Isolation transformer
(1140V to 220V)
RS485
CAN
Terminal control,
analog input, relay
output, etc.
M1
R, S, T
GD3000
2#
Input reactor
Isolation transformer
(1140V to 220V)
RS485
CAN
Terminal control,
analog input, relay
output, etc.
M2
R, S, T
Master
Slave
R, S, T
Communication
control
Master-slave
communication
A.2 Debugging procedure
Goodrive3000 VFD has special function group of master-slave control. Only by simple parameter settings can users
realize master-slave operation and power balance among multiple motors. There are two modes of master-slave control
set by P21.02.
When P21.02=0, master-slave mode 0, set the master (1) and slave(s) in speed control mode and adopt droop control to
realize power balance. The flow is shown as follows:
Master-slave mode 0
Frequency
reference
Speed
control
Speed
control
ACC/DEC step
M1
M2
Droop control
P08.30
Droop control
P08.30
+
+
+
+
Slave
Master
Master VFD
Slave VFD
Note:
Both the master and slave use speed control, and power balancing is performed by droop control.
The master-slave mode is applicable to both rigid connection and flexible connection. It is generally recommended in
flexible connection.
