9400000-J0 Rev C
20
6.3 Power System Assembly and Mounting
6.3.1 Shelf Preparation/Mounting
NOTE:
Mount the shelf in a clean and dry environment. Allow at least 1.75” of free space in
front of the unit for unrestricted cooling airflow. Sufficient free space must be provided
at the front and rear of the power system. This is to meet the cooling requirements of
the rectifiers and to allow easy access to the power system components.
The 19” shelf has been designed for flush mounting in a standard EIA relay rack. Options for mid-mounting in a
19” or 23” rack are also available. The 23” shelf can be flush or mid-mounted in a 23” relay rack.
Mounting brackets accommodate either 1" or 1-3/4" rack spacing. Mount the shelf to the rack using at least two
#12 – 24 x 1/2" screws in each bracket. Use Philips-type screws and screwdriver to eliminate the possibility of
slippage and scratching of the unit’s exterior.
An electrical conducting path must exist between the shelf chassis and the metalwork of the enclosure in which
it is mounted or a grounding conductor. This electrical continuity requirement can be met by the use of thread-
forming type unit mounting screws and star washers that remove any paint or non-conductive coatings and
establish metal-to-metal contact.
6.3.2 Rack Mounted Systems
Attach the power system to the customer-provided relay rack using the mounting screws and star washers. En-
sure a proper electrical bond between the system chassis and the relay rack.
6.3.3 Floor Mounted Systems
Secure the system to a concrete floor using either heavy duty anchors (½" x 2½"), or for wooden floors, heavy-
duty lag screws (5/8" x 2½"). Use appropriately sized flat washers.
If required, use isolating kits to isolate system from the floor.
Secure the relay rack to the overhead cable tray. Alpha does not supply the mechanical details necessary for
overhead support.
