Mitsubishi Electric A800 Instruction Manual page 31

Terminal connection diagrams
System configuration (for operating three inverters in parallel)
• Install wiring of the RS-485 terminals in between the converter units and between the inverters as shown in the figure in
page 31. (For the details of wiring of the RS-485 terminals, refer to
• Install wiring in between the converter unit and the inverter used in a pair and between the pairs as shown in the diagram in
page 31. (For details of wiring between the converter units and the inverters, refer to
• Set the inverter Pr.1001 as shown in the table below. (For details of Pr.1001, refer to the Parallel Operation Function
Manual.)
Inverter Pr.1001 setting
Master station 300
Slave station 1 1
Slave station 2 2
Parameter setting procedure
1
Install wiring of the RS-485 terminals in between the inverters.
2
Set "1" in Pr.1001 of the slave 1 inverter, and then reset the inverter.
3
Set "2" in Pr.1001 of the slave 2 inverter, and then reset the inverter.
4
Set "300" in Pr.1001 of the master inverter, and then reset the inverter.
• After the wiring of the RS-485 terminals and the setting of Pr.1001 on all inverters are completed, communication between
the inverters starts automatically.
NOTE
• It is not important which order steps 2 and 3 are performed in.
• Set up the slave inverter first before the master inverter by the Pr.1001 setting and the inverter reset.
Otherwise, an error may occur in communication between the inverters.
• For the inverters operated in parallel, the wiring length for the three phases between each inverter and the
motor must be the same. Otherwise, normal operation may not be possible.
• When the parameter setting procedure is completed, the Parallel operation ready (Y227) signal turns ON if the
signal is preset to output. (For the details of the Y227 signal, refer to the Parallel Operation Function Manual.)
CAUTION
 Be sure to set Pr.1001 correctly. Operation with incorrect settings may damage the inverters.
 When connecting wiring between the inverter outputs (U, V, and W) and the motor, the phase sequence must be
the same. Connect wiring between the master and slave inverter outputs with the correct phase sequence.
Otherwise the inverter may be damaged.
30
INSTALLATION AND WIRING
page 50.)
page 32.)