Toshiba G7 manual Connecting the ASD, System Grounding

When installing multiple ASDs, ensure that there is a clearance space of at least 8 inches (20 cm) from the top and the bottom of adjacent units. There should be at least 2 inches (5 cm) on either side of adjacent units. For the models below 50 HP the top and bottom clearance specifications may be reduced to 4 inches (10 cm). This space ensures that adequate ventilation is provided (see the section titled Enclosure Dimensions and Conduit Plate Information on pg. 182 for additional information on mounting space requirements).

Note: Ensure that the ventilation openings are not obstructed.

ASDs produce high-frequency noise — steps must be taken during installation to avoid the negative effects of noise. Listed below are some examples of measures that will help to combat noise problems.

•Separate the input and output power conductors of the main circuit. Do not install the input and output wires in the same duct or in parallel with each other, and do not bind them together.

•Do not install the input or output power conductors of the main circuit and the wires of the control circuit in the same duct or in parallel with each other, and do not bind them together.

•Use shielded wires or twisted wires for the control circuits.

•Ensure that the grounding terminals (G/E) of the ASD are securely connected to ground.

•Connect a surge suppressor to every electromagnetic contactor and every relay installed near the ASD.

•Install noise filters as required.

Connecting the ASD

DANGER

Refer to the section titled Installation Precautions on pg. 4 and the section titled Lead Length Specifications on pg. 21 before attempting to connect the ASD and the motor to electrical power.

System Grounding

Proper grounding helps to prevent electrical shock and to reduce electrical noise. The ASD is designed to be grounded in accordance with Article 250 of the 2002 NEC or Section 10/Part One of the Canadian Electrical Code (CEC).

The grounding conductor shall be sized in accordance with Article 250-122of the NEC or Part One- Table 6 of the CEC.

Note: The metal of conduit is not an acceptable ground.

The input, output, and control lines of the system shall be run in separate metal conduits and each shall have its own ground conductor.

Power Connections

DANGER

L1/R, L2/S, and L3/T are the 3-phase input supply terminals for the ASD. The ASD may be operated from a single-phase supply. When operating using a single-phase supply, use the L1 and L3 terminals.

T1/U, T2/V, and T3/W are the output terminals of the ASD that connect to the motor.

G7 ASD Operation Manual 19