Mounting and Wiring Guidelines

2–2

Installation, Wiring, and Specifications

Panel Layout & There are many things to consider when designing a panel layout. We suggest you

Clearancesconsider the following items (but there may be additional requirements depending upon your application).

•The D4–470 must be mounted horizontally for proper ventilation.

•There should be a minimum of 7.2” between the D4–470 and the closests expansion base.

•A minimum clearance of 2” between the D4–470 and the top, bottom, and sides of the cabinet should be provided.

•There must be a minimum clearance of 2” between the panel door and the nearest D4–470, DL205 or DL405 component.

•Connect the ground terminal on the D4–470 to a single point ground. Use copper stranded wire to achieve a low impedance. Copper eye lugs should be crimped and soldered to the ends of the stranded wire to ensure good surface contact. Remove anodized finishes and use

copper lugs and star washers at termination points. A rule of thumb is to achieve 0.1 Ω of DC resistance between the D4–470 base and the single point ground.

•There must be a single point ground (e.g. copper bus bar) for all devices in the panel requiring an earth ground return. The single ground point must be connected to the panel ground termination.

The panel ground termination must be connected to earth ground. For this connection you should use #12 AWG stranded copper wire as a minimum. Minimum wire sizes, color coding, and general saftey practices should comply with appropriate electrical codes for your area. A good common ground reference (Earth ground) is essential for proper operation of the D4–470, which include:

a)Installing a ground rod as close to the panel as possible.

b)Connection to incoming power system ground.

•Installations where the ambient temperature may approach the lower or upper limits of the specifications should be evaluated carefully. To do this place a temperature probe in the panel, close the door and operate the system until the ambient temperature has stabilized. If the ambient temperature is not within the operating specification for the D4–470, measures such as installing a cooling/heating source must be taken to get the ambient temperature within the D4–470 operating specifications.

•Device mounting bolts and ground braid termination bolts should be #10 copper bolts or equivalent. Tapped holes instead of nut–bolt arrangements should be used whenever possible. To assure good ground contact on termination areas impediments such as paint, coating or corrosion should be removed in the area of contact.