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Table of Contents Expand all

play_arrow Fast Track: Initial Installation
- Fast Track to Rack Installation and Power
- Claim, Onboard, and Configure SRX4700
play_arrow Overview
play_arrow Site Planning, Preparation, and Specifications
play_arrow Initial Installation and Configuration
play_arrow Maintain Components
play_arrow Troubleshoot Hardware
- Troubleshoot the SRX4700
play_arrow Contact Customer Support and Return the Chassis or Components
- Return an SRX4700 Chassis or a Component
play_arrow Safety and Compliance Information

list Table of Contents

English

Connect SRX4700 to Power

date_range 31-Mar-25

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This section takes you through numerous steps and safety precautions to be followed while connecting power to the SRX4700, to prevent equipment damage and personal injury.

Note:

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect the SRX4700 to an earth ground before you connect it to power.

Tools and Parts Required to Ground and Connect the SRX4700 to Power

To ground and to provide power to the firewall, you need the following tools and parts:

Phillips (+) screwdrivers, Number 1 and Number 2
A socket nutdriver
A 2.5-mm flat-blade (–) screwdriver
A torque-controlled driver, with a maximum torque capacity of 23 lbf-in. (2.6 Nm) to 25 lbf-in. (2.8 Nm) for tightening screws to terminals on each power supply unit (PSU) on a DC-powered firewall.

CAUTION:
The maximum torque rating of the terminal screws on the DC power supply is 23 lbf-in. (2.6 Nm) through 25 lbf-in. (2.8 Nm). If you apply excessive torque, you might damage the terminal screws. Use only a torque-controlled driver to tighten screws on the DC power supply terminals. Use an appropriately sized driver, with a maximum torque capacity of 6 lb-in. (0.6 Nm) or less. Ensure that the driver is undamaged and properly calibrated and that you have been trained in its use. You might want to use a driver that is designed to prevent overtorque when the preset torque level is achieved.
Electrostatic discharge (ESD) grounding wrist strap.

Connect Earth Ground to the SRX4700

To ground the SRX4700 Firewall:

Ensure that you have the following parts and tools available:

Grounding cable for your firewall (not provided)—The grounding cable must be 6 AWG (13 mm²), minimum 90° C wire, or as permitted by the local code.
Grounding lug for your grounding cable (not provided)—The grounding lug required is a Panduit LCD6-14AF-L or equivalent.
Two pan head M5 x10 mm screws with integrated split washers (not provided)—The screws and washers are used to secure the grounding lug to the protective earthing terminal.

Wrap and fasten one end of the electrostatic discharge (ESD) cable grounding strap around your bare wrist, and connect the other end to a site ESD point or to the ESD point on your firewall.

1

Chassis ESD Point
Connect the grounding cable to a proper earth ground, such as the rack in which you will mount the firewall.
Place the grounding cable terminal attached to the grounding cable over the grounding point.

1

Chassis grounding point
Secure the grounding cable terminal to the grounding point using the M5 screws.
Dress the grounding cable. Ensure that the cable doesn’t block access to or come in contact with other firewall components, and that it doesn’t drape where people could trip over it.

Connect AC Power to the SRX4700

The AC PSUs in an SRX4700 are hot-removable and hot-insertable field-replaceable units (FRUs). You can remove and replace the AC PSUs without powering off the firewall or disrupting its functions.

CAUTION:

You must not mix AC and DC PSUs in the same chassis.

Before you begin to connect AC power to the firewall:

Ensure that you have connected the chassis to an earth ground.

Warning:
Before you connect power to the firewall, a licensed electrician must attach a cable terminal to the grounding and power cables that you supply. A cable with an incorrectly attached terminal can damage the firewall (for example, by causing a short circuit).

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect the chassis to an earth ground before you connect it to power. For installations that require a separate grounding conductor to the chassis, use the protective earthing terminal on the firewall chassis to connect to the earth ground. The firewall gains additional grounding when you plug the PSU in the firewall to a grounded AC power outlet. Use the AC power cord appropriate for your geographical location.
Ensure that you have a power cord appropriate for your geographical location available to connect AC power to the firewall.
Read AC Power Electrical Safety Guidelines and Action to Take After an Electrical Accident.
Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage.
Ensure that you have an ESD grounding strap.
If not already installed, install the PSUs in the firewall.

To connect AC power to an SRX4700:

Wrap and fasten one end of the ESD wrist strap around your bare wrist, and connect the other end of the strap to the ESD point on the firewall.
Locate the AC power cords shipped with the SRX4700; the cords have plugs appropriate for your geographical location. See Supported AC Power Cords.
Insert the coupler end of the power cord into the AC power cord inlet on the AC power supply faceplate.
Push the retainer clip through the loop and tighten it until it fits snug around the power cord.
Repeat step 3 and step 4 to insert the second power cord.
If the AC power source outlet has a power switch, set it to the off (O) position.
Insert the power cord plug into an AC power source outlet.

Note:
Each PSU must be connected to a dedicated AC power feed and a dedicated customer-site circuit breaker. We recommend that you use a dedicated customer-site circuit breaker rated for 16 A (250 VAC) minimum, or as required by local code.

Warning:
The firewall is a pluggable type A equipment installed in a restricted-access location. It has a separate protective earthing terminal (sized for M6 hex screws) 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.
Route the power cord appropriately. Verify that the power cord does not block the air exhaust and access to firewall components or drape where people could trip on it.
If the AC power source outlet has a power switch, set it to the on (|) position.

Connect DC Power to the SRX4700

The DC power supply units (PSUs) in an SRX4700 are hot-removable and hot-insertable field-replaceable units (FRUs). You can remove and replace the DC PSUs without powering off the firewall or disrupting its functions.

CAUTION:

You must not mix AC and DC PSUs in the same chassis.

Before you begin to connect DC power to the firewall:

Ensure that you have connected the chassis to an earth ground.
Ensure that you have the DC power cables and lugs to connect DC power to the firewall.
Read Action to Take After an Electrical Accident.
Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage.
Ensure that you have an ESD grounding strap.
If not already installed, install the power supplies in the firewall.

You connect DC power to the firewall by attaching power cables from the external DC power sources to the terminal studs on the power supply faceplates. You must provide the power cables and cable lugs (not supplied with the firewall). For power cable specifications, see DC Power Cable Specifications.

Warning:

Before you connect power to the firewall, a licensed electrician must attach appropriate cable terminals to the grounding and power cables that you use. A cable with an incorrectly attached terminal can damage the firewall (for example, by causing a short circuit).

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must properly ground the chassis before connecting power. See Connect Earth Ground to the SRX4700 for instructions.

Warning:

Before performing the following procedure, ensure that you remove the power from the DC circuit. To ensure that all power is off, locate the circuit breaker on the panel board that services the DC circuit. Switch the circuit breaker to the OFF position (0), and tape the switch handle of the circuit breaker in the OFF position.

To connect the DC source power cables to the firewall for each PSU:

Switch off the dedicated facility circuit breakers. Ensure that the voltage across the DC power source cable leads is 0 V. You must ensure that the cable leads do not become active during installation.
Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
Install heat-shrink tubing insulation around the power cables:
1. Slide the tubing over the portion of the cable where it is attached to the terminal barrel. Ensure that the tubing covers the end of the wire and the barrel of the terminal attached to it.
2. Shrink the tubing with a heat gun. Ensure that you heat all sides of the tubing evenly so that it shrinks around the cable tightly.
  
  Note:
  Make sure that you do not overheat the tubing.
  
  Figure 1: Install Heat-Shrink Tubing
Verify that you have correctly labeled the DC power cables before making connections to the power supply.
In a typical power distribution scheme where the return is connected to chassis ground at the battery plant, you can use a multimeter to verify the ohm output of the —48 V and return (RTN) DC cables to chassis ground. The cable with very large resistance (indicating an open circuit) to chassis ground will be —48 V. The cable with very low resistance (indicating a closed circuit) to chassis ground will be RTN.

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 power supply.
The DC power supply has two terminals labeled —48 V/—60 V (negative) and RTN (positive) for connecting the DC power cables labeled positive (+) and negative (—). The terminals are covered by a cover on the terminal block.
Using a screwdriver (anticlockwise), unscrew the nut on top of the terminal block.
Remove the nuts from the four terminals.
Secure each power cable lug to the terminals with the nuts. Tighten the nuts on the power supply terminals until snug by using the screwdriver. Apply between 23 lbf-in. (2.6 Nm) to and 25 lbf-in. (2.8 Nm) of torque to the nuts. Do not apply vertical force while tightening the screws. Do not overtighten the nuts. (Use a socket nutdriver.)
1. Secure the positive (+) DC source power cable lug to the RTN (return) terminal.
2. Secure the negative (—) DC source power cable lug to the —48 V/—60 V (input) terminal.
CAUTION:
Ensure that each power cable lug seats flush against the surface of the terminal block as you are tightening the nuts. Ensure that each nut is properly threaded into the terminal. Applying installation torque to the nuts when improperly threaded can result in damage to the terminal.

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 power supply.
Place the terminal block cover on and tighten the screw.
Verify that the power cables are connected correctly, that they do not touch or block access to firewall components, and that they do not drape where people could trip on them.
Switch the circuit breaker on the panel board that services the DC circuit to the ON (|) position.
Connect the power cables to the external DC power source. If the external DC power source has a switch, set it to the ON (|) position.

Power Off the SRX4700

For a graceful shutdown, press and hold the power button for atleast 4 seconds. The firewall begins gracefully shutting down the operating system (OS) and then powers itself off.

CAUTION:

Use the graceful shutdown method to power off or reboot the firewall.

To remove power completely from the firewall, unplug the AC power cord or DC power supply cable.

After powering off the device, wait at least 60 seconds before turning it back on. After powering on the device, wait at least 10 seconds before turning it off.

When the system is completely powered off and you turn on the power supply, the firewall starts as the PSU completes its startup sequence. If the firewall finishes starting and you need to power off the device again, first issue the request vmhost halt command.

Note:

The fans in the PSU continue to rotate even after you power off the SRX4700 Firewall. To stop the fans, remove the power cord from the PSU. The fans will stop in a few seconds.

After turning on the power supply, it can take up to 60 seconds for status indicators—such as the PWR LED and the show chassis command display—to indicate that the power supply is functioning normally. Ignore error indicators that appear during the first 60 seconds.

arrow_backward PREVIOUS Connect SRX4700 to External Devices

NEXT arrow_forward Configure Junos OS on the SRX4700

SRX4700 Firewall Hardware Guide

ON THIS PAGE

Connect SRX4700 to Power

Tools and Parts Required to Ground and Connect the SRX4700 to Power

Connect Earth Ground to the SRX4700

Connect AC Power to the SRX4700

Connect DC Power to the SRX4700

Power Off the SRX4700

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