Mitsubishi Electric FR-A820-00046 Instruction Manual page 128

Connection of stand-alone option units
NOTES The voltage phases of terminals R/L1, S/L2, and T/L3 and the voltage phases of terminals R4/L14,
S4/L24, and T4/L34 must be matched.
The control logic (sink logic/source logic) of the high power factor converter and the inverter must
be matched. (Refer to page 2-49.)
Do not connect a DC reactor (FR-HEL) to the inverter when FR-HC2 is connected.
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Installation and wiring