Mounting The Asd - Toshiba G7 Operation Manual

The G7 series of drives has no fuse in its main circuit. When two or more drives are connected to the same
power line as shown in
ensure that if a short circuit occurs in ASD 1, only MCCB2 trips, not MCCB1. If it is not feasible to use
this configuration, insert a fuse between MCCB2 and ASD 1.
Caution!

Mounting the ASD

Install the unit securely in a well ventilated area that is out of direct sunlight using the four mounting holes
on the rear of the ASD. The ambient temperature rating for the G7 is from 14 to 104° F (-10 to 40° C).
The process of converting AC to DC, and then back to AC produces heat. During normal operation of the
ASD, approximately 5% of the input energy to the ASD is dissipated as heat. If installing the ASD in a
cabinet, ensure that there is adequate ventilation.
Do Not operate the ASD with the enclosure door open.
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 the unit to the adjacent unit. There should be at least 2 inches (5 cm) on either side
of the unit to the adjacent unit. 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
requirements).
Note:
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.
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G7 ASD Operation Manual
Figure 1, it will be necessary to select a circuit-breaking configuration that will
Figure 1. Circuit breaker configuration.
Enclosure Dimensions on pg. 165
Ensure that the ventilation openings are not obstructed.
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 terminal (G/E) of the ASD is securely connected to ground.
Connect a surge suppressor to every electromagnetic contactor and every relay installed near the
ASD.
Install noise filters as required.
for additional information on mounting space
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