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Not all ASDs are equipped with internal primary power input fuses (HP dependent). When connecting
two or more drives that have no internal fuse to the same power line as shown in
Figure
1, it will be
necessary to select a circuit-breaking configuration that will 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.
Figure 1. Typical Circuit Breaker Configuration.
Mounting the ASD
CAUTION
— The following thermal specifications apply to the 230- and 460-volt ASDs ONLY —
Install the unit securely in a well ventilated area that is out of direct sunlight.
The process of converting AC to DC, and then back to AC produces heat. During normal ASD
operation, up to 5% of the input energy to the ASD may be 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.
The ambient operating temperature rating of the Q9 ASD is 14° to 104° F (-10° to 40° C).
When installing adjacent ASDs horizontally Toshiba recommends at least 5 cm of space between
adjacent units. However, horizontally mounted ASDs may be installed side-by-side with no space in
between the adjacent units — side-by-side installations require that the top cover be removed from each
ASD.
For 150 HP ASDs and above, a minimum of 50 cm of space is required above and below adjacent units
and any obstruction. This space is the recommended minimum space requirement for the ASD and
ensures that adequate ventilation is provided for each unit. More space will provide a better
environment for cooling (See the section titled
Enclosure Dimensions on pg. 49
for additional
information on mounting space requirements).
Note:
Ensure that the ventilation openings are not obstructed.
Q9 ASD Quick Start Guide
11
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