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MX480 AC Power System

 

MX480 AC Power Supply Description

Each AC power supply weighs approximately 5.0 lb (2.3 kg) and consists of one AC appliance inlet, an AC input switch, a fan, and LEDs to monitor the status of the power supply. Figure 1 shows the power supply. For existing power supplies, each inlet requires a dedicated AC power feed and a dedicated 15 A (250 VAC) circuit breaker.

For high-capacity power supplies, each inlet requires a dedicated AC power feed and a dedicated 16.0 A @ 100 VAC or 16.0 A @ 200 VAC circuit breaker, or as required by local code.

The maximum inrush current for a high-capacity AC power supply is 49A at 264VAC.

Figure 1: AC Power Supply
AC Power Supply
Figure 2: High-Capacity AC Power Supply
High-Capacity AC Power Supply
Warning

The router is pluggable type A equipment installed in a restricted-access location. It has a separate protective earthing terminal (sized for UNC 1/4-20 ground lugs) provided on the chassis in addition to the grounding pin of the power supply cord. This separate protective earthing terminal must be permanently connected to earth.

AC Power Supply Configurations

The MX480 high-capacity and normal-capacity power supplies each support either of the following AC power configurations:

  • In the low-line (110 V) AC power configuration, the MX480 router contains three or four AC power supplies (see Figure 1), located horizontally at the rear of the chassis in slots PEM0 through PEM3 (left to right). Each AC power supply provides power to all components in the router. When three power supplies are present, they share power almost equally within a fully populated system. Four AC power supplies provide full power redundancy. If one power supply fails or is removed, the remaining power supplies assume the entire electrical load without interruption. Three power supplies provide the maximum configuration with full power for as long as the router is operational. The low-line configuration requires three power supplies and the fourth power supply provides redundancy. With high-capacity power supplies, you must have a minimum of three power supplies installed in the router.

  • In the high-line (220 V) AC power configuration, the MX480 router contains two or four AC power supplies (see Figure 1), located horizontally at the rear of the chassis in slots PEM0 through PEM3 (left to right). In a high-line AC power configuration, each AC power supply provides power to all components in the router. When two or more power supplies are present, they share power almost equally within a fully populated system. Four AC power supplies provide full power redundancy. If one power supply fails or is removed, the remaining power supplies assume the entire electrical load without interruption. Two power supplies provide the maximum configuration with full power for as long as the router is operational. In the two-PEM high-line configuration, slots PEM0 and PEM1 or PEM2 and PEM3 are used. The high-line configuration requires two power supplies, with the third and fourth providing redundancy. With high-capacity power supplies, you must have a minimum of two power supplies installed in the router.

MX480 AC Power Supply LEDs

Each AC power supply faceplate contains three LEDs that indicate the status of the power supply (see Table 1). The power supply status is also reflected in two LEDs on the craft interface. In addition, a power supply failure triggers the red alarm LED on the craft interface.

Table 1: AC Power Supply LEDs

Label

Color

State

Description

AC OK

Yellow

Off

AC power input voltage is below 78 VAC.

Green

On

AC power input voltage is within 78–264 VAC.

DC OK

Green

Off

DC power outputs generated by the power supply are not within the normal operating ranges.

On

DC power outputs generated by the power supply are within the normal operating ranges.

PS FAIL

Red

Off

Power supply is functioning normally.

On

Power supply is not functioning normally and its output voltage is out of regulation limits. Check AC OK and DC OK LEDs for more information.

AC Electrical Specifications for the MX480 Router

Table 2 lists the AC power supply electrical specifications; Table 3 lists the AC power system specifications.

Table 2: AC Power Supply Electrical Specifications

Item

Specification

Normal-Capacity Power Supplies

Maximum output power

1027 W (low line)

1590 W (high line)

AC input voltage

Operating range: 100 – 240 VAC (nominal)

AC input line frequency

50 to 60 Hz (nominal)

AC input current rating

11.0 A @ 200 VAC or 14.5 A @ 110 VAC maximum

Efficiency

Note: This value is at full load and nominal voltage.

85% (low line and high line)

High-Capacity Power Supplies

Maximum output power

1167 W (low line)

2050 W (high line)

AC input voltage

Operating range: 100 – 240 VAC (nominal)

AC input line frequency

50 to 60 Hz (nominal)

AC input current rating

16 A @ 110 VAC maximum

15.1 A @ 200 VAC maximum

Efficiency

Note: This value is at full load and nominal voltage.

84% (low line)

89% (high line)

Table 3: AC Power System Specifications

Item

Normal Capacity–Low Line

Normal-Capacity–High Line

High-Capacity–Low Line

High-Capacity–High Line

Redundancy

3+1

2+2

3+1

2+2

Output power (maximum) per power supply

1027 W

3200 W

1167 W

2050 W

Output power (maximum) per system

3081 W

3200 W

3501 W

4100 W

AC Power Circuit Breaker Requirements for the MX480 Router

Each AC power supply has a single AC appliance inlet located on the power supply that requires a dedicated AC power feed. We recommend that you use a customer site circuit breaker rated for 15 A (250 VAC) minimum for each AC power supply, or as required by local code. Doing so enables you to operate the router in any configuration without upgrading the power infrastructure.

AC Power Cord Specifications for the MX480 Router

Each AC power supply has a single AC appliance inlet located on the power supply that requires a dedicated AC power feed. Most sites distribute power through a main conduit that leads to frame-mounted power distribution panels, one of which can be located at the top of the rack that houses the router. An AC power cord connects each power supply to the power distribution panel.

You can order detachable AC power cords, each approximately 8 ft (2.5 m) long that supply AC power to the router. The C19 appliance coupler at the female end of the cord inserts into the AC appliance inlet coupler, type C20 (right angle) as described by International Electrotechnical Commission (IEC) standard 60320. The plug at the male end of the power cord fits into the power source receptacle that is standard for your geographical location.

Table 4 provides specifications and Figure 3 depicts the plug on the AC power cord provided for each country or region.

Table 4: AC Power Cord Specifications

Country

Model Number

Electrical Specification

Plug Type

Australia

CBL-M-PWR-RA-AU

240 VAC, 50 Hz AC

SAA/3/15

China

CBL-M-PWR-RA-CH

220 VAC, 50 Hz AC

CH2-16P

Europe (except Denmark, Italy, Switzerland, and United Kingdom)

CBL-M-PWR-RA-EU

220 or 230 VAC, 50 Hz AC

CEE 7/7

Italy

CBL-M-PWR-RA-IT

230 VAC, 50 Hz AC

CEI 23-16/VII

Japan

CBL-PWR-RA-JP15

125 VAC, 50 or 60 Hz AC

JIS 8303

CBL-M-PWR-RA-JP

220 VAC, 50 or 60 Hz AC

NEMA L6-20P

North America

CBL-PWR-RA-US15

125 VAC, 60 Hz AC

NEMA 5-15P

CBL-PWR-RA-TWLK-US15

125 VAC, 60 Hz AC

NEMA L5-15P

CBL-M-PWR-RA-US

250 VAC, 60 Hz AC

NEMA 6-20

CBL-M-PWR-RA-TWLK-US

250 VAC, 60 Hz AC

NEMA L6-20P

United Kingdom

CBL-M-PWR-RA-UK

240 VAC, 50 Hz AC

BS89/13

Figure 3: AC Plug Types
AC Plug Types
Warning

The AC power cord for the router is intended for use with the router only and not for any other use.

Warning

Translation from Japanese: The attached power cable is only for this product. Do not use the cable for another product.

Note

In North America, AC power cords must not exceed 4.5 m (approximately 14.75 ft) in length, to comply with National Electrical Code (NEC) Sections 400-8 (NFPA 75, 5-2.2) and 210-52, and Canadian Electrical Code (CEC) Section 4-010(3). You can order AC power cords that are in compliance.

Warning

The router is pluggable type A equipment installed in a restricted-access location. It has a separate protective earthing terminal (sized for UNC 1/4-20 ground lugs) provided on the chassis in addition to the grounding pin of the power supply cord. This separate protective earthing terminal must be permanently connected to earth.

Caution

Power cords and cables must not block access to device components or drape where people could trip on them.

Outstanding Issues with the MX480 Router

This topic lists outstanding hardware issues with the MX480 router. For information about software issues, see the Junos OS Release Notes.

  • In Junos OS Release 10.0R2, if a third AC supply is inserted in an empty slot (even though the power supply is turned off and the AC cord is not plugged in), the operational power supplies’ output voltage reading in the Junos OS can show an inaccurate number (60-61V instead of 57V) under some conditions, such as when the load is nearly 100% and the operating temperature exceeds 40C.

  • There is an input mode switch on each MX480 DC high capacity power supply, covered by a small plate. The input mode switch tells the system what capacity feed is connected (60A or 70A), which in turn is used for power inventory management When the input mode switch is set to '0' (zero): expect 60A feeds, with a voltage range of -39V to -72VDC. When the input mode switch is set to '1' (one), expect 70A feeds or 60A feed with minimum voltage range 42V and up. The default setting is 1

    In Junos OS Releases 10.0R3, 10.1R2, and 10.2R1, the MX480 DC high capacity power supply input mode switch is not operating as expected, though this has no effect on the power supply operations, it will generate alarms incorrectly. [PR532230]

    Note
    • All supplies should have the same feed setting.

    • Correct usage of the feed setting is required for all supplies in order to get the desired power inventory management.

  • Juniper Networks strongly recommends that you install Junos OS Release 8.4R2 or later before deploying the MX480 router into service.

  • The XFP cages and optics on the MX480 router are industry standard parts that have limited tactile feedback for insertion of optics and fiber. You need to insert the optics and fiber firmly until the latch is securely in place. [PR/98055]

  • Do not mix AC and DC power supplies on an MX480 router. Mixing of AC supplies and DC supplies may damage your chassis. [PR/233340]

Errata with the MX480 Router Documentation

This topic lists outstanding documentation issues:

  • The shut-down voltage and start-up voltages as stated in the following note in the MX480 hardware guides and MX480 Quick Start are not correct under all circumstances: [PR/273771]

    Note

    If the input voltage from the DC power source drops below –36.5 to –38.5 VDC, the router automatically shuts down. During automatic shutdown, the circuit remains active. When the input voltage returns to –40.0 to –41.0 VDC, the router automatically starts up again and the system returns to normal operation within 30 minutes. No operator intervention is required.

  • For the cooling system to function properly, the airflow around the chassis must be unrestricted. Allow at least 8 in. (20.3 cm) of clearance between side-cooled routers. Allow 5.5 in. (14 cm) between the side of the chassis and any non-heat-producing surface such as a wall. [PR/258887]

  • When installing the router without a mechanical lift, remove and reinstall components from the chassis, first from the rear and then from the front. Components should be removed and reinstalled in the following order: power supplies, fan tray, SCBs, and DPCs.[PR/265034]

  • Replace the air filter, located at the left rear of the router, every 6 months for optimum cooling system performance.

  • Two threaded inserts (PEM nuts) are provided on the upper rear of the chassis for connecting the router to earth ground. The grounding points fit UNC 1/4–20 screws (American).

  • The mounting shelf should be installed on the back of the rail as described in the MX480 5G Universal Routing Platform Hardware Guide.

  • After installing a DC power cable or AC power cord, route the power cable or power cord along the cable restraint towards the left or right corner of the chassis. If needed, thread plastic cable ties, which you must provide, through the openings on the cable restraint to hold the power cord or cables in place.

  • Table 5 describes the functions of the host subsystem OFFLINE LED.

    Table 5: Host Subsystem OFFLINE LED

    Label

    Color

    State

    Description

    OFFLINE

    Red

    On steadily

    Host is installed but the Routing Engine is offline.

    Off

    Host is not installed.