With ZSS being enabled and being mapped to one of the digital inputs, the protective
device checks the ZSS input status at the very moment it sees a start – it wants to sense
the initially closed zero-speed switch, which opens shortly thereafter as the motor spins. If
it fails to nd the closed contact, it trips immediately. Check the wiring and contact for
problems.
150 www.eaton.com EMR-3MP0
4 Protective Elements
4.2 Motor Starting and Control Module
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