Can two units of PCR-LE series be used to provide a single-phase three-wire output?

Yes, but the optional 2P05-PCR-LE (single-phase three-wire output driver) is required to connect and control two PCR-LEs.
Additionally, you need to check if the board is inserted in the SLOT1 on the rear panel. If it is not already installed, we kindly request that you consider purchasing it.
If you use PCR4000LE, the firmware version 2.00 or later is required. If not, please contact your distributor or agent to update the firmware.