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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 find the closed contact, it trips immediately. Check the wiring and contact for
problems.
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EMR-3MP0
4 Protective Elements
4.2 Motor Starting and Control Module