Mitsubishi Electric FR-A872-P Instruction Manual page 37

 System configuration example (for operating two units in parallel)
• Wire the RS-485 terminals between the inverters as shown in the figure in
485 terminals, refer to
• Wire the terminals between the converter units and the inverters as shown in
the converter units and the inverters, refer to
• Set the inverter Pr.1001 Parallel operation selection as shown in the table below. (For the details of Pr.1001, refer to the
Parallel Operation Function Manual.)
Inverter
Master station
Slave station
Parameter setting procedure
1.
Wire the RS-485 terminals between the inverters.
2.
Set "1 or 2" in Pr.1001 of the slave inverter, and then reset the inverter.
3.
Set "200" 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
• Set Pr.1001 and perform inverter reset for the slave first, and then set Pr.1001 and perform inverter reset for the master.
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 wiring the inverter outputs (U, V, and W) and the motor, the phase sequence must be the same. Perform wiring
between the master and slave inverter outputs with the correct phase sequence. Otherwise the inverter may be damaged.
36
2. INSTALLATION AND WIRING
2.4 Terminal connection diagrams
page 67.)
page
Pr.1001 setting
200
1 or 2
page
40.)
37. (For details of the wiring of the RS-
page 37. (For details of the wiring between