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Connecting Nidec equipment

Nidec's Neptune motors bring out Modbus on a labelled terminal block and four discrete switch inputs alongside it, with a +12 V source on the same block to drive them. The one thing Nidec does not publish is the protocol itself.

Pump motors

Guides · 1

Nidec Neptune 1.65 / 2.25 / 2.7 THP Pumps
Modbus on TB3 or four switch inputs on TB4. Covers the isolation requirement, the auxiliary relay that closes at 2100 RPM, and the protocol you have to ask for.