Mounting The Asd; Connecting The Asd; System Grounding - Toshiba H7 Operation Manuals

Mounting the ASD

Install the unit securely in a well ventilated area that is out of direct sunlight using the four mounting
Caution!
holes on the rear of the ASD. When replacing an H3 ASD with a H7 ASD, see
for a listing of the optional H3-to-H7 Adapter Mounting Plates.
The ambient temperature rating for the H7 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 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.
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/Weight on pg. 188
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.
• 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
DANGER!
Specifications on pg. 10

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 input, output, and control lines of the system shall be run in separate metal conduits and each shall
have its own ground conductor.
8
Ensure that the ventilation openings are not obstructed.
Installation Precautions on pg. 2
before attempting to connect the ASD and the motor to electrical power.
The metal of conduit is not an acceptable ground.
for additional information on mounting space requirements).
and the section titled
Appendix B on pg. 196
Lead Length
H7 ASD Operation Manual