G7 ASD Operation Manual
19
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
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 250-122 of 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
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.
DANGER
DANGER
