Elevator Core Reference Guide

Adequate safety earthing must be provided in accordance with local wiring rules and codes of practice. The ground terminal of the drive should be connected back to the common safety earth bar to maintain touch potentials within safe limits.

The ground terminal the drive should be individually connected DIRECTLY to the site ground bus bar (through the EMC filter if installed).

Drive ground connections should not loop from one drive to another, or to, or from any other equipment. Ground impedance must conform to local industrial safety regulations and/or electrical codes.

To meet UL regulations, UL approved ring crimp terminals should be used for all ground wiring connections.

The integrity of all ground connections should be checked periodically.

The Cross-sectional area of the PE Conductor must be at least equal to that of the incoming supply conductor.

The motor ground must be connected to one of the ground terminals on the drive.

As with all inverters, a leakage current to earth can exist. The drive is designed to produce the minimum possible leakage current whilst complying with worldwide standards. The level of current is affected by motor cable length and type, the effective switching frequency, the earth connections used and the type of RFI filter installed. If an ELCB (Earth Leakage Circuit Breaker) is to be used, the following conditions apply:

The safety ground terminal provides a grounding point for the motor cable shield. The motor cable shield connected to this terminal (drive end) should also be connected to the motor frame (motor end). Use a shield terminating, EMI clamp.