Replacing the Chassis' Power Filter Units


Replacing the Chassis' Power Filter Units
 
Up to two -48 VDC Power Filter Unit (PFU) assemblies can be installed in the chassis. Using two PFUs, the recommended default, provides load-balancing and redundancy. The PFUs are located in the lower-rear of the chassis.
This chapter provides instructions for replacing a PFU in the event of failure.
Caution: Although a single PFU can provide power for a fully loaded chassis, it is strongly recommended that two PFUs always remain installed for load-balancing and redundancy.
ESD Caution: During installation, maintenance, and/or removal, wear grounding wrist straps to avoid ESD damage to the components. Failure to do so could result in damage to electrical components and could potentially void your warranty.
Determining that a PFU has Failed
The chassis can use one of several mechanisms to indicate a PFU failure. The first indicator is when the POWER LED on the PFU is off. If the LED is off and a starPowerState SNMP trap is generated with a value of Failed (2), the PFU needs to be replaced.
If you do not receive this trap, try the following suggestions to diagnose the cause:
 
Removing the Failed PFU
In the event of a PFU failure, follow these instructions to safely remove the PFU from the system.
Step 1
Step a
Step b
Step c
Step 2
Warning: To avoid the risk of electric shock, verify that the power source is completely shut down before proceeding to the next step. Vor dem naechsten Schritt Spannungsversorgung abschalten, um einen elektrischen Schlag zu vermeiden.
Step 3
Step 4
Step a
Step b
Step 5
Step a
Step b
Step 6
Step 7
Step 8
Proceed to the Installing the Replacement PFU section that follows.
 
Installing the Replacement PFU
Follow the instructions below to install the replacement PFU in the chassis.
Step 1
Step 2
Step 3
Step 4
Each of the four power terminals is shipped with one nut and two washers. The 165A PFU has one lock-washer and one flat washer.
Warning: To avoid electric shock, ensure that the power source is off before attaching power cables to the PFU(s) installed in the chassis. Spannungsversorgung abschalten vor Anschluss der Kabel an die Netzteile, um einen elektrischen Schlag zu vermeiden.
Step 5
Step a
Step b
Step 6
Step 7
Step 8
Step a
Step b
Secure the lug to the RTN terminals using two of the four washers and two of the four nuts that were removed in step 3. The nuts on the 165A PFU should be torqued to 50 in-lb. (5.65 n-m).
Step 9
Step a
Step b
Secure the lug to the -VDC terminals with the remaining two washers and nuts you removed in step 7. The nuts on the 165A PFU should be torqued to 50 in-lb. (5.65 n-m).
Warning: To avoid the risk of fire, take proper precautions to ensure that the power feed and return lugs are not touching. Um einen Kurzschluss zu vermeiden, duerfen sich die beiden Stromkabel nicht beruehren.
Step 10
Caution: To avoid the risk of electric shock and/or potential damage to the system, never operate the chassis without the plastic terminal cover. In addition, the power and return lugs must not protrude past the edge of the plastic terminal covers. Any portion of the lug that is exposed must be covered with shrink wrap.
Step 11
Apply power to the PFUs using the information and instructions in the Applying Power to the Chassis section of the Applying Power and Verifying the Installation chapter of this guide.
What to do with the Failed PFU
If the failed PFU is still under warranty, return it to the vendor for repair.
If the failed PFU is out of warranty, contact the vendor to determine if it can be sent in for repair at an additional cost.
For new customers: Refer to the support area of http://www.cisco.com for up-to-date product documentation pertaining to installation, configuration, and maintenance. A valid username and password are required to use this site. Please contact your local sales or service representative for additional information.
For existing customers with support contracts through Starent Networks: Refer to the support area of http://www.starentnetworks.com for up-to-date product documentation pertaining to installation, configuration, and maintenance. A valid username and password are required to use this site. Please contact your local sales or service representative for additional information.
 

Cisco Systems Inc.
Tel: 408-526-4000
Fax: 408-527-0883