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PTX5000 DC Power System

PTX5000 DC Power System Description

PTX5000 DC Power Distribution Unit

DC PDUs Supported on the PTX5000

The PTX5000 supports the DC power distribution units (PDUs) in Table 1.

Table 1: DC PDUs Supported on the PTX5000

Name

Model Number

First Supported Junos OS Release

DC PDU (120-A feeds)

PDU-PTX-DC-120

12.1X48

12.3

DC PDU (60-A feeds)

PDU-PTX-DC-60

12.1X48R3

12.3

High Capacity DC PDU (60-A feeds)

PDU2-PTX-DC

14.1

PTX5000 Normal Capacity DC PDU

Normal Capacity 60-A DC PDU Components
Note:

The 60-A DC PDUs do not have circuit breakers.

Figure 1 shows the 60-A DC PDU. Each 60-A DC PDU weighs approximately 60 lb (27.2 kg).

Figure 1: 60-A DC PDU60-A DC PDU
  1
Metal handle
  4
Input power switches
  2
Power OUTPUT switch
  5
Input power trays
  3
Air exhaust ventilation
 

Each 60-A DC PDU has the following components:

  • Four removable input power trays, labeled 0 through 3, from left to right. The input power trays are hot-removable and hot-insertable.

    Each 60-A input power tray weighs 1.6 lb (0.7 kg), not including cables. The input power tray has two inputs, labeled input –2 and input –1. Each input is labeled RTN and –48 V. The input power switch for both inputs in each input power tray is located on the PDU above the input power tray.

    Figure 2: 60-A DC Input Terminals60-A DC Input Terminals
  • LEDs to monitor the status of the PDU:

    60-A DC PDU—PDU OK, SW0 ON, SW1 ON, SW2 ON, SW3 ON, DC IN 0 -1, DC IN 0 -2, DC IN 1 -1, DC IN 1 -2, DC IN 2 -1, DC IN 2 -2, DC IN 3 -1, DC IN 3 -2.

  • Twenty-one monitored electronic fuses for the fan trays, Control Boards, and FPCs.

    Note:

    There are no mechanical fuses in the PDU to be replaced. For output voltage, current protection is provided by electronic fuses, hot-swap circuits, or ORing circuit. Electronic fuses and hot-swap circuits also provide current limitation.

Note:

The PDUs contain no fans, but are cooled by the fans in the power supply modules.

120-A DC PDU Components
Note:

The 120-A DC PDUs have circuit breakers and over current protection.

Figure 3 shows the 120-A DC PDU. Each 120-A DC PDU weighs approximately 60 lb (27.2 kg).

Figure 3: 120-A DC PDU120-A DC PDU
  1
Metal handle
  4
Circuit breakers
  2
Power switch
  5
Input power trays
  3
Air exhaust ventilation
 

Each 120-A DC PDU has the following components:

  • Four removable input power trays, labeled 0 through 3, from left to right. The input power trays are hot-removable and hot-insertable.

    Each 120-A input power tray weighs 1.6 lb (0.7 kg), not including cables. The input power tray has one input, labeled RTN and –48 V, from left to right, and has its own 125-A circuit breaker located on the PDU above the input power tray.

  • LEDs to monitor the status of the power supply:

    120-A DC PDU—PDU OK, –48 V 120 A, and CB ON

  • Twenty-one monitored electronic fuses for the fan trays, Control Boards, and FPCs.

    Note:

    There are no mechanical fuses in the PDU to be replaced. For output voltage, current protection is provided by electronic fuses, hot-swap circuits, or ORing circuit. Electronic fuses and hot-swap circuits also provide current limitation.

Note:

The PDUs contain no fans, but are cooled by the fans in the power supply modules.

High Capacity DC PDU Description

The High Capacity DC PDU (60-A) provides 30.4 kW power output and you can connect a maximum of eight High Capacity PSMs to the PDU. Each DC PDU can receive up to sixteen 60-A DC input feeds from source outputs and provides two isolated outputs, a 12 V output at 2034 A maximum and a 36-V output at 167 A maximum. The 36-V output provides power to the vertical and horizontal fan trays and the 12-V output provides power to the system boards such as FPCs, SIBs, Routing Engines, and Control Boards (CBs). Additionally, the PSMs provide 5-V bias output to the PDUs. Each DC PDU can receive up to sixteen 60-A DC input feeds and weighs 64.5 lb (29.3 kg).

Note:

You cannot mix existing PDUs with the High Capacity DC PDU.

The following is a list of some of the features of the High Capacity DC PDU :

  • Supports up to eight PSMs, each PSM requires two 60-A feeds.

  • Operates from 40 VDC through 72 VDC.

  • I2C bus protocol fault reporting and control.

  • Front-to-back airflow direction.

  • Single output enable or disable switch to switch on or switch off the output of the PDU, which enables or disables the outputs from all the PSMs in the PDU.

  • Reverse polarity protection—The PDU or PSMs are not damaged even if the input voltage is reversed for an indefinite period of time.

  • Hot-pluggable and hot-removable.

  • No power zoning for PSMs.

Note:
High Capacity DC PDU Components
Note:

The High Capacity 60-A DC PDUs do not have circuit breakers.

Figure 4 shows the High Capacity 60-A DC PDU. Each 60-A DC PDU weighs approximately 64.5 lb (29.3 kg).

Figure 4: High Capacity DC PDUHigh Capacity DC PDU
  1
Metal handle
  4
PSM LEDs
  2
PDU OK LED
  5
Input power terminals and safety cover
  3
Power switch
 

Each High Capacity DC PDU has the following components:

  • Four fixed power input terminal blocks stacked vertically. Each terminal has inputs for each PSM—for example, PSM0_1— indicates the first input terminal for PSM0. Each input is also labeled RTN and –48 V/60A (see Figure 5 and Figure 6).

    Figure 5: High Capacity DC Input TerminalsHigh Capacity DC Input Terminals
    Figure 6: High Capacity DC Input Terminal PositionsHigh Capacity DC Input Terminal Positions
  • Sixteen LEDs to monitor the status of the PDU—See PTX5000 DC Power Distribution Unit LEDs for details.

  • Air exhaust ventilation

PTX5000 DC Power Supply Module
DC PSMs Supported on the PTX5000

The PTX5000 supports the DC power supply modules (PSMs) in Table 2.

Table 2: DC PSMs Supported on the PTX5000

Name

Model Number

First Supported Junos OS Release

DC PSM (120-A)

PSM-PTX-DC-120

12.1X48

12.3

DC PSM (60-A)

PSM-PTX-DC-60

12.1X48R3

12.3

High Capacity DC PSM (60-A)

PSM2-PTX-DC

14.1

PTX5000 Normal Capacity DC PSM

Figure 7 shows both the normal-capacity 60-A DC PSM and 120-A DC PSM. Each DC PSM weighs approximately 10.6 lb (4.8 kg).

CAUTION:

The 60-A DC PSM and 120-A DC PSM are not interchangeable. The 60-A DC PSM must be installed in the 60-A DC PDU. The 120-A DC PSM must be installed in the 120-A DC PDU. The faceplate of both DC PSM looks the same. To avoid damaging the connectors on the back of the PSM or inside the PDU, use caution to ensure that you have the correct PSM before installing it in the PDU.

Figure 7: 60-A DC PSM and 120-A DC PSM60-A DC PSM and 120-A DC PSM
PTX5000 High Capacity DC PSM

Each High Capacity DC PSM has 3.8 kW output and accepts two 60-A input feeds. These PSMs are smaller than the 60-A DC and 120-A DC PSMs, allowing up to eight PSMs to be installed per PDU, and up to 16 PSMs per chassis. The following is a list of some of the features of the High Capacity DC PSM:

  • Single non-isolated output: 12 V @ 3800 W

  • Two 40 VDC–72 VDC inputs, up to 60 A maximum each

    Note:

    Both inputs are required for the PSM to function.

  • One bias output voltage: +5 V at 2.4-A maximum

  • Hot-swappable

  • Self-cooled with monitored, variable-speed fans

  • I2C fault reporting and control

Figure 8 shows the High Capacity DC PSM.

Figure 8: High Capacity DC PSMHigh Capacity DC PSM

PTX5000 DC Power Distribution Unit LEDs

60-A DC PDU LEDs

Figure 9 shows the 60-A DC PDU LEDs.

Figure 9: 60-A DC PDU60-A DC PDU
  1
PDU OK LED
  3
DC IN LEDs
  2
SW ON LEDs
 

Table 3 describes the LEDs on the 60-A DC PDU faceplate.

Table 3: 60-A DC PDU LEDs

LED

Color

State

Description

PDU OK—One per power supply

Green

On steadily

PDU is functioning normally.

Red

On steadily

PDU has failed.

Off

PDU might be starting up or not receiving any input voltage.

DC IN—One per input

Green

On steadily

Input is receiving voltage.

Off

Input voltage is not present, or is under –40 V.

SW ON—One per input power tray

Green

On steadily

The input power switch is powered on.

Off

The LED might be off for one of the following reasons:

  • The input power switches might be off or the host subsystem detected a failure and turned off the input power switch.

  • The input power switch is on but at least one input is under –40 V.

The input is not receiving any voltage.

120-A DC PDU LEDs

Figure 10 shows the 120-A DC PDU LEDs.

Figure 10: 120-A DC PDU LEDs120-A DC PDU LEDs
  1
PDU OK LED
  3
–48 V 120 A LED
  2
CB ON LED
 

Table 4 describes the LEDs on the 120-A DC PDU faceplate.

Table 4: 120-A DC PDU LEDs

LED

Color

State

Description

PDU OK—One per power supply

Green

On steadily

PDU is functioning normally.

Red

On steadily

PDU has failed.

Off

PDU might be starting up or not receiving any input voltage. The circuit breakers might be off.

–48 V 120 A—One per input

Green

On steadily

Input is receiving voltage.

Off

Input voltage is not present, or is under –40 V.

CB ON—One per input

Green

On steadily

Circuit breaker is powered on.

Off

Circuit breaker is not powered on, or the circuit breaker is on but the input is under –40 V. The circuit breaker might have been turned off, the host subsystem detected a failure and turned off the circuit breaker, or the power supply is not receiving any input voltage.

High Capacity DC PDU LEDs

Figure 11 shows the High Capacity DC PDU LEDs.

Figure 11: High Capacity DC PDU LEDsHigh Capacity DC PDU LEDs
  1
PDU OK LED
  2
PSM_0 through PSM_7 LEDs—There are two LEDs—-1 and -2— that indicate the status of the two inputs for each PSM, that is, input -1 and -2.

Table 5 describes the LEDs on the High Capacity DC PDU faceplate.

Table 5: High Capacity DC PDU LEDs

LED

Color

State

Description

PDU OK—One per power supply

Green

On steadily

PDU is functioning normally.

Blinking

A 36 V converter fault has occurred, but the 36 V output remains operational.

Red

On steadily

PDU has failed.

Off

This LED can be off for one of the following reasons:

  • The PDU is not receiving any input voltage.

  • The PDU is starting up.

PSM_0 through PSM_7, for the eight PSMs per PDU.

Note:

There are two LEDs labeled -1 and -2, indicating the two DC inputs for each PSM.

Green

On steadily

Input voltage is normal and less than –43 V.

Off

Input voltage is not present, or is less than –20 V.

Green

Blinking

Input is receiving voltage and voltage is between –20 V and –43 V.

Red

On steadily

Connection is reversed.

PTX5000 DC Power Supply Module LEDs

60-A and 120-A DC Power Supply Module LEDs

Table 6 describes the DC power supply module LEDs on the faceplate. The 60-A PSM and 120-A PSM have the same LEDs.

Figure 12: DC PSM LEDsDC PSM LEDs
  1
DC IN OK LED
  3
FAULT () LED
  2
DC OUT OK LED
 
Table 6: DC Power Supply Module LEDs

LED

Color

State

Description

DC IN OK

Green

On steadily

PSM is receiving voltage.

Blinking

PSM is receiving voltage outside the range of –40 V through –72 V.

Off

Input voltage is not present.

DC OUT OK

Green

On steadily

Output is functioning normally, and input voltage is within the range of the range of –40 V through –72 V.

Blinking

PSM is not enabled or is in a fault condition, or the input voltage to the PSM is too low.

Off

Output is not functioning normally because of a fault condition or the PSM is not receiving input voltage.

FAULT ()

Red

On steadily

PSM might be starting up, not properly installed, not receiving sufficient power, or not functioning properly.

Off

No faults have been detected for the PSM, or the PSM is not receiving any input voltage.

High Capacity DC Power Supply Module LEDs

Figure 13 shows the High Capacity DC power supply module LEDs and Table 7 describes the LEDs.

Figure 13: High Capacity DC PSM LEDsHigh Capacity DC PSM LEDs
  1
Input 1 OK LED
  3
Output OK LED
  2
Input 2 OK LED
  4
Fault () LED
Table 7: High Capacity DC Power Supply Module LEDs

LED

Color

State

Description

Input 1 OK

Green

On steadily

Input 1 is present, the PSM is receiving voltage between –40 V and –72 V.

Blinking

PSM is receiving voltage outside –40 V and –72 V.

Off

Input voltage is not present on input 1.

Input 2 OK

Green

On steadily

Input 2 is present, the PSM is receiving voltage between –40 V and –72 V.

Blinking

PSM is receiving voltage outside –40 V and –72 V.

Off

Input voltage is not present on input 2.

Output OK

Green

On steadily

Power supply output is functioning normally.

Blinking

PSM is not enabled or is in a fault condition, or the input voltage to the PSM is too low.

Off

Output is not functioning normally because of a fault condition or the PSM is not receiving input voltage.

Fault ()

Red

On steadily

PSM might be starting up, not properly installed, not receiving sufficient power, or not functioning properly.

Off

No faults have been detected for the PSM, or the PSM is not receiving any input voltage.

PTX5000 DC Power System Electrical Specifications

Table 8 lists the DC power system electrical specifications.

Table 8: Power System Electrical Specifications

Item

Specification

DC input voltage

Operating range: –40.0 to –72.0 VDC

DC system current rating

372 A @ –48 VDC (nominal) (17,856 W)

Table 8 lists the High Capacity DC power system electrical specifications.

Table 9: High Capacity Power System Electrical Specifications

Item

Specification

DC input voltage

Operating range: –40.0 to –72.0 VDC

DC system current rating

704 A @ –48 VDC (nominal) (30,400 W)

For details on circuit breakers, see PTX5000 AC and DC PDU Electrical and External Circuit Breaker Specifications.

PTX5000 DC Power Distribution Unit Specifications

Table 10, Table 11, and Table 12 list the electrical specifications for each DC power distribution unit (PDU).

For circuit breaker requirement, see PTX5000 AC and DC PDU Electrical and External Circuit Breaker Specifications or as required by local code.

Table 10: 60-A DC PDU Electrical Specifications

Item

Specification

DC input voltage

Nominal –48 VDC, –60 VDCOperating range: –40.0 to –72.0 VDC

Input DC current rating

51 A @ –48 VDC (nominal) (2444 W) per input

Table 11: 120-A PDU Electrical Specifications

Item

Specification

DC input voltage

Nominal –48 VDC, –60 VDCOperating range: –40.0 to –72.0 VDC

Input DC current rating

92.5  A @ –48 VDC (nominal) (4440 W) per input

Table 12: High Capacity PDU Electrical Specifications

Item

Specification

DC input voltage

Nominal –48 VDC, –60 VDCOperating range: –40.0 to –72.0 VDC

Input DC current rating

44.2 A @ –48 VDC (nominal) (2120 W) per input

To allow for future growth so that you can operate the PTX5000 in any hardware configuration without upgrading the power infrastructure, we recommend that you provision the following:

  • 60-A DC PDU: 51 A @ –48 VDC per input.

  • 120-A DC PDU: 92.5  A @ –48 VDC per input.

  • High Capacity DC PDU: 44.2 A @ –48 VDC per input.

Although the power requirements for each input might vary, we recommend that you provision the same amount of power for each input. Actual power consumption will be less than the recommended amount provisioned.

PTX5000 DC Power Cable and Lugs Specifications

DC Power Cables

You must supply the DC power cables which meet the specifications in Table 13, or as required by the local code, laws, and standards.

Table 13: Power Cable Specifications

60-A DC PDU

6-AWG (13.3  mm2) minimum

4-AWG (21.2 mm2) maximum

120-A DC PDU

0-AWG (53 mm2)

High Capacity DC PDU

6-AWG (13.3  mm2) minimum

4-AWG (21.2 mm2) maximum

Warning:

For field-wiring connections, use copper conductors only.

Warning:

DC power cables must not block access to PTX5000 components or drape where people could trip on them.

CAUTION:

Before PTX5000 installation begins, a licensed electrician must attach a cable lug to the power cables that you supply. A cable with an incorrectly attached lug can damage the PTX5000.

CAUTION:

You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (–) to indicate their polarity. There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminal studs on each PDU.

DC Power Lugs

The accessory box shipped with the PTX5000 includes 0-AWG and 4-AWG cable lugs . The cable lugs are dual hole, and sized to fit 1/4-20 UNC terminal studs at 15.86-mm (0.625-in.) center line. Table 14 indicates the cable lug specifications for each type of PDU.

You attach these cable lugs to the DC terminal studs of each input power tray of the 60-A and 120-A PDUs and to the terminal studs (16 for eight PSMs) in the front of the High Capacity DC PDU. The 0-AWG cable lug is also used for grounding the PTX5000.

Table 14: DC Power Cable Specifications

PDU

Cable Lugs

60-A

6-AWG (13.3 mm  2) minimum

4-AWG (21.2 mm2) maximum

See Figure 15.

120-A

0-AWG (53 mm2),

See Figure 14.

High Capacity (60-A)

6-AWG (13.3 mm  2) minimum

4-AWG (21.2 mm2) maximum

See Figure 15.

Note:
Figure 14: 0-AWG DC Power Cable Lug0-AWG DC Power Cable Lug
Figure 15: 4-AWG DC Power Cable Lug4-AWG DC Power Cable Lug

PTX5000 DC Power Distribution

Most sites distribute DC power through a main conduit that leads to frame-mounted DC power distribution panels, one of which might be located at the top of the rack that houses the PTX5000. A pair of cables (one input and one return) connects each set of terminal studs to the power distribution panel.

Note:

All inputs on the DC PDU in slot 0 must be powered by dedicated power feeds derived from feed B, and all inputs on the DC PDU in slot 1 must be powered by dedicated power feeds derived from feed A. This configuration provides the commonly deployed A/B feed redundancy for the system.

Figure 16 shows a typical DC source cabling arrangement and two 120-A DC PDUs. The source cabling distribution for 60-A DC PDUs would be similar.

Figure 16: Typical DC Source Cabling to the PTX5000Typical DC Source Cabling to the PTX5000