Neutral connection for ATS - delta utility/solidly grounded generator


The utility incoming is 3PH, 3W 600V delta, no ground. The generator is 3PH, 3W, WYE, neutral solidly.
Is it correct to use 3P ATS whereby the 3W from utility is line 1, the 3PH wires from generator is line 2. In the case the neutral connections wouldn't be used on the ATS.

The load is 3PH MCC.