Mitsubishi Electric FR-A802-P Instruction Manual page 33

Terminal connection diagrams
System configuration (for operating three inverters in parallel)
• Wire the RS-485 terminals between the converter units and between the inverters as shown in the figure in
details on wiring of the RS-485 terminals, refer to
• Wire the terminals of the converter units and the inverters as shown in the diagram in
converter units to inverters, refer to
• Set Pr.1001 of the inverter as shown in the following table. (For details on 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
Wire the RS-485 terminals of 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.
• Communication between the inverters will start automatically once the RS-485 terminals have been wired and Pr.1001 has
been set on all inverters.
NOTE
• The order in which steps 2 and 3 are performed is not important.
• 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 inverters that are connected in parallel, ensure that the 3-phase wiring between each motor and inverter is
the same length. Otherwise, normal operation may not be possible.
• The Parallel operation ready (Y227) signal will turn ON once the parameters are set and the RS-485 terminals
have been wired to the inverters correctly. (For details on the Y227 signal, refer to the Parallel Operation
Function Manual.)
• Only a single wound motor can be driven by three inverters in parallel.
CAUTION
 Be sure to set Pr.1001 correctly. Operation with incorrect settings may damage the inverters.
 Ensure that the motor is wired to the inverter outputs (U, V. and W) in the correct phase sequence. Use the
correct phase sequence when wiring the master and slave inverter outputs. Otherwise the inverter may be
damaged.
32
INSTALLATION AND WIRING
page 55.)
page 34.)
page
page 33. (For details on wiring
33. (For