Cabling the Power Filter Units

 

 

This chapter provides information and instructions for applying the power feed and return cables to the Power Filter Units (PFUs) and the chassis.

 

Power Considerations

Each chassis supports one or two 165-amp PFUs.

The following table describes the power requirements for the chassis.

Chassis Power Requirements

Characteristic	Value
Input Voltage	Maximum range: -40VDC to -60VDC Nominal range: -48VDC to -60 VDC
TUV Rated Peak Current Load	145A @ -48 VDC
Maximum Peak Power Load	5760W
Chassis Maximum Power Load (fan trays)	800W
Line Card (rear-installed) Maximum Power Load	SPIO: 15W FELC: 13.5W GELC/GLC2: 10.5W RCC: 20W QGLC: 15W XGLC: 25W OLC2: 23W CLC2: 23W
Application Card (front-installed) Maximum Power Load	SMC: 130W PSC: 250W PSC2: 325W PSC3: 330W PPC: 275W

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Estimating Power Requirements

Use the following formula to estimate the total power consumption for each deployed chassis:

(Total Application Card Maximum Power Load) + (Total Line Card Maximum Power Load) + (Chassis Maximum Power Load)

Example

The calculation for estimating the power required for an ASR 5000 installation with 3 PSCs, 2 SMCs, 2 SPIOs, 2 RCCs, and 4 Ethernet 1000 line cards is as follows:

(250W x 3) + (130W x 2) + ((20W x 2) + (13.5W x 4)) + 800W = 1934W

 

Power Cable Requirements

You can install up to three chassis in an equipment rack or telecommunications cabinet. It is recommended that you run the power cabling from the Power Distribtion Frame (PDF) to the rack or cabinet and then to each of the chassis through a fuse panel installed in the rack. Due to the required bending radius at each of the system’s PFUs, distributing power through a fuse panel allows you to use a smaller, more flexible cable for each chassis.

The following table identifies the recommended gauges for power cables.

Recommended Cable Gauge Information

Termination	Gauge Information
PDF to Fuse Panel	Assuming an 80-foot (24 meters) loop length, each cable between the PDF and fuse panel must be the equivalent of 350,000 circular mils or greater. Calculations assume a 0.3 volt drop from the PDF to the fuse panel, and a 0.3 volt drop from the fuse panel to the chassis. This is a total voltage drop of 0.6 volts.
Fuse Panel to ASR 5000	Assuming an 18-foot (5.5 meter) loop length, each cable between the fuse panel and the chassis must be the equivalent of 83,690 circular mils (1 AWG) or greater. Use high-flex cable. Calculations assume a 0.3 volt drop from the PDF to the fuse panel, and 0.3 volt drop from the fuse panel to the chassis. This is a total voltage drop of 0.6 volts. The following figure and table provide a diagram and details for wiring the PFUs.

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ASR 5000 PFU Wiring Diagram

ASR 5000 PFU Wiring Diagram Descriptions

Item	Description
1	Two 2-hole lugs are required: one for return (RTN) and one for power (-VDC). PFU has 0.3125-inch posts D, spaced 0.88-inch on center. Method of connection: PFU - Flat Washer - Lug - Lock-Washer - Nut (9/16-inch). The nut(s) must be torqued to 50 in-lb. (5.65 N-m). Use the Panduit® lug supplied with the chassis (LCD1-56C-E) with Panduit crimp tool part number CT-920 (die color: green P37 (CD-920-1). The lug must be covered with heat shrink tubing. The heat shrink tubing should begin approximately 1 inch (25.4 mm) before the lug and extend to within 0.5 inch (12.7 mm) of the lugs first hole. Refer to the following figure. Warning: The plastic terminal cover must be installed over power and return lugs at all times. Die angeschlossenen Kabelschuhe muessen mit der Plastikabdeckung gesichert sein.
2	Power Cables (Fuse Panel-to-Chassis): Cable length: Not more than 9 feet (2.7 meters) one way Voltage drop: 0.3v Cable size: 1 AWG or greater
3	Power Cables (PDF-to-Fuse Panel): Cable length: not more than 40 feet (12.2 meters) one way Voltage drop: 0.3v Cable size: 350,000 Circular Mils

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Power Lug Details

 

Connecting the PFU to the Power Source

Follow the instructions in this section to connect the PFU(s) to the power source.

Each of the four power terminals is shipped with nuts and washers. The PFU has one lock-washer and one flat washer.

Warning: To avoid electric shock, verify that the power source from the fuse panel is OFF before attaching power cables to the PFU(s) installed in the chassis. Spannungsversorgung abschalten vor Anschluss der Kabel an die Netzteile, um einen elektrischen Schlag zu vermeiden.

Step 1

Flip the circuit breaker actuator on the PFU nstalled in the bay labeled Power Filter Unit 1 to the OFF position. If the circuit breaker on the PFU is equipped with a locking clip, lock the circuit breaker in place by moving the breaker’s locking clip to the right until the clip’s inside tang is recessed in the breaker’s actuator opening.

Step 2

Remove the plastic cover from the power terminals with a #2 Philips head screw driver.

Step 3

Use a 9/16-inch nut driver or socket wrench to remove the nuts and the lock-washers from each of the four terminals.

Step 4

Connect the lug attached to the power return cable to the PFU:

Step a

Insert the lug over the two terminals labeled RTN. These are the two top terminals on the PFU.

Step b

Secure the lug to the RTN terminals with two of the four washers and two of the four nuts that you removed in step 3. The nuts should be torqued to 50 in-lb. (5.65 N-m).

Step 5

Connect the lug attached to the power feed cable to the PFU:

Step a

Insert the lug over the two terminals labeled -VDC. These are the two bottom terminals on the PFU.

Step b

Secure the lug to the -VDC terminals with the remaining two washers and nuts that you removed in step 3. The nuts should be torqued to 50 in-lb. (5.65 N-m).

Warning: To avoid the risk of fire, take proper precautions to ensure that the power feed and return lugs are not touching. Um einen Kurzschluss zu vermeiden, duerfen sich die beiden Stromkabel nicht beruehren. Kabelschuhe duerfen sich nicht beruehren und muessen unbedingt auseinander gehalten werden.

Step 6

Reinstall the plastic terminal cover.

Caution: To avoid the risk of electric shock and/or potential damage to the system, never operate the chassis without the plastic terminal cover installed. Make sure that the power and return lugs do not protrude past the edge of the plastic terminal covers. Any portion of the lug that is exposed must be covered with heat shrink tubing.

Step 7

Repeat step 1 through step 6 for the PFU installed in the bay labeled Power Filter Unit 2.

Step 8

Proceed to the next chapter for information and instructions on applying power to the chassis and verifying that the installation was successful.

 

 

Cisco Systems Inc.

Tel: 408-526-4000

Fax: 408-527-0883