Power Supply Harmonic

Elevator & Escalator Malfunction | VFD Drive card failure

Elevator Malfunction

VSD harmonics, 3rd harmonic from LED lamp & regeneration breaking create elevator problem, ARD/ ERD malfunction, stuck elevator door & landing maloperation. The triplen, also called third or zero sequence harmonics current, from the building's LED lamps and other electronic gadgets don't get cancelled but add up at the neutral wire. It creeps into building's electronic equipment and causes elevator malfunction and VSD card failures. The Automatic Rescue Device, also call Emergency Rescue Device becomes ineffective with control card failure.