DC Power Rectifier

The following procedures direct the installation of the 19-inch DC Rectifier Shelf used to provide DC power to the Tellabs 1150 (MDS5) and/or Tellabs 1150E (MDS7) shelves, as well as supporting Fan Trays. The DC Rectifier Shelf can support up to three rectifier modules.

Note:  If installing the DC Rectifier Shelf in a 23-in rack, a pair of mounting ear extensions are required and must be ordered separately.

Required Tools

The power system is designed to be installed with the following commonly available tools:

• #1 and #2 Phillips screwdrivers
• Torque wrench
• 5/16 and 7/17-in box wrenches, sockets, and nut drivers
• Wire and cable strippers
• Wire and cable crimpers.

Site and Equipment Preparation

Before unpacking the 19-inch DC Rectifier Shelf, note any physical damage to the packaging that could indicate potential damage to the contents. After removing the system from the boxes and packing material, inspect for any shipping or other damage. Contact the Tellabs® sales representation or Tellabs® Technical Assistance Center (TAC) (refer to "Contacting Technical Support") immediately if there is any apparent damage.

All required tools, wires, cables, and hardware should be available before proceeding. To the extent possible, ensure a clean (free of debris, dust, and foreign material) work environment. Care should be taken during the installation to prevent exposure of the equipment to wire clippings. If possible, rectifiers should remain sealed in the shipping containers until the shelf wiring is complete. Ensure that all power sources are off and disconnected.

Power System Mounting and Wiring

Before installing the power system, the following safety requirements should be considered:

• Elevated Operating Ambient - If installed in a closed or multi-unit rack assembly, the operating ambient temperature of the rack may be greater than room ambient. Therefore, consideration should be given to installing the equipment in an environment compatible with the maximum ambient temperature (Tma) specified by the manufacturer.
• Reduced Air Flow - Installation of the equipment in a rack should be such that the amount of air flow required for safe operation of the equipment is not compromised.
• Mechanical Loading - Mounting of the equipment in a rack should be such that a hazardous condition is not achieved due to uneven mechanical loading.
• Circuit Overloading - Considerations should be given to the connection of the equipment to the supply circuit and the effect that overloading of circuits might have on over-current protection and supply wiring. Appropriate consideration of equipment nameplate ratings should be used when addressing this concern.
• Reliable Earthing - Reliable earthing of rack-mounted equipment should be maintained. Particular attention should be given to supplying connections other than direct connections to the branch circuit (e.g. use of power strips).

AC Input Requirements

The DC Rectifier shelf uses an individual feed AC architecture (see Fig. 4) via a rear AC terminal block.

An individual feed architecture powers one rectifier on each AC feed. Connect each feed, sized according to Table 2, on to #8-32 screws. All grounds should be on 1/4"-20 studs, as shown in Step 2. Choose AC ring terminals from the list in Table 2. The AC terminal strip on the rear of the shelf can accept ring terminals of less the 0.5" width. A knockout is provided for cable entry to the AC block that accepts a 1-1/4" conduit or two knockouts that accept 3/4" conduit. The individual feed system is not designed to accept four AC cords.

Figure 4: Individual Feed AC Wiring Architecture
 

 Table 2: Recommended AC Circuit Breaker and Wire Sizes