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.
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
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).
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 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.
The PDUs contain no fans, but are cooled by the fans in the power supply modules.
120-A DC PDU Components
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).
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.
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).
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.
High Capacity DC PDU Components
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).
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 Terminals
Figure 6: High 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.
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).
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.
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.
PTX5000 DC Power Distribution Unit LEDs
60-A DC PDU LEDs
Figure 9 shows the 60-A DC PDU LEDs.
1 — PDU OK LED | 3 — DC IN LEDs |
2 — SW ON LEDs |
Table 3 describes the LEDs on the 60-A DC PDU faceplate.
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 is not receiving any voltage. |
120-A DC PDU LEDs
Figure 10 shows the 120-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.
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.
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.
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:
|
|
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.
1 — DC IN OK LED | 3 — FAULT ( |
2 — DC OUT OK LED |
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.
1 — Input 1 OK LED | 3 — Output OK LED |
2 — Input 2 OK LED | 4 — Fault ( |
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.
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.
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.
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 |
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 |
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.
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 |
For field-wiring connections, use copper conductors only.
DC power cables must not block access to PTX5000 components or drape where people could trip on them.
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.
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.
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.
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.
