Baldor E100 manual Power connections, Earthing / grounding, Protection class, Earth leakage

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3.4 Power connections

This section provides instructions for connecting the AC power supply.

The installer of this equipment is responsible for complying with NEC (National Electric Code) guidelines or CE (Conformite Europeene) directives and application codes that govern wiring protection, earthing/grounding, disconnects and other current protection.

DANGER: Electrical shock can cause serious or fatal injury. Do not touch any power device or electrical connection before you first ensure that power has been disconnected and there is no high voltage present from this equipment or other equipment to which it is connected.

MicroFlex e100 drives are designed to be powered from standard single and three-phase lines that are electrically symmetrical with respect to earth/ground. The power supply module within all MicroFlex e100 models provides rectification, smoothing and current surge protection. Fuses or circuit breakers are required in the input lines for cable protection.

Note: A Residual Current Device (RCD) must not be used for fusing the drive. An appropriate type of circuit breaker or fuse must be used.

All interconnection wires should be in metal conduits between the MicroFlex e100, AC power source, motor, host controller and any operator interface stations. Use UL listed closed loop connectors that are of appropriate size for the wire gauge being used. Connectors are to be installed using only the crimp tool specified by the manufacturer of the connector. Only class 1 wiring should be used.

3.4.1 Earthing / grounding

A permanent earth/ground bonding point is provided on the heatsink, which must be used as the protective earth. It is labeled with the protective earth symbol in the casting and does not form any other mechanical function.

Connector X1 contains earth terminals, but these must not be used as protective earth since the connector does not guarantee earth connection first, disconnection last. Earthing methods are shown in section 3.4.2.

Note: When using unearthed/ungrounded distribution systems, an isolation transformer with an earthed/grounded secondary is recommended. This provides three-phase AC power that is symmetrical with respect to earth/ground and can prevent equipment damage.

3.4.1.1Protection class

User protection has been achieved using Protective Class I (EN61800-5-1, 3.2.20), which requires an earth connection to the unit whenever hazardous voltages are applied. The equipment provides protection against electric shock by:

H Means of connection of protective earth to accessible live conductive parts. H Basic insulation.

3.4.1.2Earth leakage

Maximum earth leakage from the MicroFlex e100 is 3.4mA per phase (230V 50Hz supply). This value does not include the earth leakage from the AC power filter, which could be much larger (see section A.1.3). If the MicroFlex e100 and filter are mounted in an enclosure, it is recommended the enclosure is earthed using a 10mm2 conductor.

MN1942 Basic Installation 3-11