Replacing an M7i AC Power Supply
An AC-powered router has one or two load-sharing, redundant AC power supplies. Each power supply is hot-removable and hot-insertable, as described in M7i Field-Replaceable Units (FRUs). For full redundancy, two power supplies are required. If a power supply stops functioning for any reason, the remaining power supply instantly begins providing all the power the router needs for normal functioning, and can provide full power indefinitely. For more information about AC power supplies, see M7i AC Power Supply.
To replace an AC power supply, perform the following procedures:
Removing an M7i AC Power Supply
Before removing the AC power supply from an M7i router with only one power supply, you must power off the router. See Powering Off the M7i Router. The AC power supplies are located at the bottom rear of the chassis, as shown in M7i Chassis Description. Each AC power supply weighs approximately 12 lb (5.5 kg).
Do not leave a power supply slot empty for more than a short time while the router is operational. The power supply must remain in the chassis for proper airflow.
To remove an AC power supply (see Figure 1):
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis. Verify that the router is attached to a proper earth ground.
- Press the power switch on the power supply faceplate to
the OFF (O) position.
Note If you are not removing the power supply, but simply powering it off, wait at least 60 seconds before turning it back on. If you need to power it off again, wait for at least 60 seconds after powering it on.
- Unplug the power cord from the appliance inlet on the faceplate.
- Loosen the thumbscrew at each corner of the power supply faceplate, using a Phillips screwdriver if necessary.
- Grasp the handle on the power supply faceplate and pull firmly to slide the unit about halfway out of the chassis.
- Place one hand under the power supply to support it, then slide it completely out of the chassis.
See also
Installing an M7i AC Power Supply
To install an AC power supply (see Figure 2):
- Verify that the switch on the power supply faceplate is in the OFF (O) position.
- Locate the power cord shipped with the router, which should be appropriate for your geographical location (see M7i Router AC Power, Connection, and Power Cord Specifications).
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis. Verify that the router is attached to a proper earth ground.
- Place one hand under the power supply and grasp the handle on the faceplate with the other hand. Slide the power supply into the chassis until it contacts the midplane.
- Starting with the bottom screw, tighten (but do not overtighten) the thumbscrews at each corner of the power supply faceplate.
- Insert the appliance coupler end of the power cord into the appliance inlet on the power supply faceplate and insert the plug into an AC power source receptacle. Verify that the power cord does not block access to router components or drape where people could trip on it.
- Press the power switch on the faceplate to the ON ( | ) position. When the power supply has powered on successfully,
the green OUTPUT OK LED lights steadily.
Note After powering off a power supply, wait at least 60 seconds before turning it back on. After powering on a power supply, wait at least 60 seconds before turning it off.
If the router is completely powered off when you power on the power supply, the Routing Engine boots as the power supply completes its startup sequence. If the Routing Engine finishes booting and you need to power off the router again, see Powering Off the M7i Router.
After a power supply is powered on, it can take up to 60 seconds for status indicators—such as the output status LED on the power supply, the command display output, and messages on the LED display on the craft interface—to indicate that the power supply is functioning normally. Ignore error indicators that appear during the first 60 seconds.
