Replacing a Power and Fan Module in BFD
538
OPERATING INSTRUCTION
1/1543-BFD 538 Uen F
Copyright
© Ericsson AB 2012. All rights reserved. No part of this document may be
reproduced in any form without the written permission of the copyright owner.
Disclaimer
The contents of this document are subject to revision without notice due to
continued progress in methodology, design and manufacturing. Ericsson shall
have no liability for any error or damage of any kind resulting from the use
of this document.
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Torx
Torx is a registered trademark of Acumen Global
Technologies.
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Contents
Contents
1
General Information
1
1.1
Scope
1
1.2
Target Groups
2
2
Prerequisites
3
2.1
General Precautions
3
2.2
Tools
3
2.3
Replacement Parts
3
3
Procedure
5
3.1
Removing the Power and Fan Module
5
3.2
Installing the Power and Fan Module
9
3.3
Performing Concluding Routines
Glossary
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Replacing a Power and Fan Module in BFD 538
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General Information
1
General Information
1.1
Scope
This document describes procedures for replacement of the two identical Power
and Fan Modules (PFMs), A or B in the BFD 538 subrack.
Only one PFM at a time can be replaced without interrupting the traffic. Either
PFM A or PFM B can be replaced without any loss of cooling and power to the
subrack. An air flap covers the hole when PFM B is removed. When replacing a
PFM, the dust filter must also be replaced. Refer to Figure 1 and the instruction
Replacing Dust Filters in BFD 538.
The PFM is available in two versions:
•
Power and Fan Module for High-Ohmic Distribution (PFM HOD)
•
Power and Fan Module for Low-Ohmic Distribution (PFM LOD)
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Replacing a Power and Fan Module in BFD 538
PFM B
PFM A
FRONT
COVER
Figure 1
1.2
2
DUST
FILTER
PFMs A and B, Front Cover, and Dust Filters
Target Groups
•
Qualified technicians who perform system maintenance and repair
•
Ericsson field personnel
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Prerequisites
2
Prerequisites
You are expected to be familiar with the contents of the following documents:
•
Personal Health and Safety Information
•
System Safety Information
2.1
General Precautions
2.1.1
ESD Wrist Strap
When working with plug-in units, use an electrostatic discharge (ESD) wrist
strap to avoid ESD damage. Connect the strap to the ESD connection point in
the upper part of the cabinet or the right side on the subrack flange.
2.1.2
Product Handling and Inspection
Keep the replacement unit in its ESD protective bag and original cardboard box
until you begin installing it in the subrack.
If the packaging material is damaged, inspect the unit. If the unit appears to be
damaged, return it to the service center for repair or replacement.
2.2
Tools
•
ESD wrist strap
•
Torx TX30 screwdriver
•
Torx TX30 bit
•
Torque screwdriver
•
Vacuum cleaner
The instruction Replacing Dust Filters in BFD 538 describes when and how to
replace the dust filters.
2.3
Replacement Parts
•
Replacement PFM unit, BFD 140 13/1 (HOD) or BFD 140 13/2 (LOD)
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Replacing a Power and Fan Module in BFD 538
•
Replacement dust filter, NTZ 109 8828/1 (two filter sheets), five sets in
the package
Make sure that the PFM is of the type (HOD or LOD) that is required for the
node.
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Procedure
3
Procedure
Do!
Always use an approved ESD wrist strap (must be in contact with your
skin) when working with sensitive equipment to avoid damage to electronic
components.
Warning!
When using an ESD wrist strap, to avoid a potentially fatal electrical discharge
through your body, the wrist strap connection must include a resistor of at least
1 M . Test the wrist strap regularly.
Section 3.1 on page 5 and Section 3.2 on page 9 describe how to replace PFM
A. PFM B is replaced in the same way.
A HOD PFM and a LOD PFM are replaced in the same way, but the LOD PFM
has only one power connector and therefore only one power cable.
3.1
Removing the Power and Fan Module
1. Put on the ESD wrist strap (must be in contact with your skin) and connect
the free end of the strap cable to the ground connection point in the upper
part of the cabinet or on the right side subrack flange. The ESD connection
point is labeled as shown in Figure 2.
Figure 2
ESD Label
2. Clean the outside of the front cover carefully by using a vacuum cleaner.
3. Loosen the front cover by pressing up the locking handles and pulling the
front cover out from the subrack. Refer to Figure 3.
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Replacing a Power and Fan Module in BFD 538
Figure 3
The Locking Handles for the Front Cover
4. Remove the front cover. Place the front cover away from the cabinet to
avoid contamination with dust from the filter.
5. Remove the left and right power cable connectors by pressing the latches
and pulling them away from the PFM. Refer to Figure 4.
The PFM LOD has only one power cable (on the left-hand side).
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Procedure
Figure 4
The Power Cable Connectors
6. Clean the front parts of the two PFMs carefully and under the removable
dust-filter under the lowest PFM carefully by using a vacuum cleaner.
7. Loosen the left and right PFM mounting screws. Use a Torx TX30
screwdriver and refer to Figure 5.
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Replacing a Power and Fan Module in BFD 538
Figure 5
The PFM Mounting Screws
8. Use the handles on the front and carefully slide the PFM out of the subrack.
Refer to Figure 6.
Caution!
Rotating fan blades can cause injury to body parts that come into contact
with them. Blades in fan units continue to rotate for a period of time, even
after the fan has been switched off. Before starting work on or near fans,
wait until they have ceased rotating completely.
Hold the PFM by its handles until the fan blades have stopped rotating.
8
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Procedure
Figure 6
3.2
Removing the PFM
Installing the Power and Fan Module
1. Take out the replacement PFM from its package.
2. Make sure that the PFM is of the right type (HOD or LOD) for the node. See
label on the right side corner of the PFM.
3. Hold the PFM by its handles and carefully slide it on the guides. Refer
to Figure 7.
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Replacing a Power and Fan Module in BFD 538
Figure 7
Installing the PFM
4. Tighten the left and right mounting screws to 5 Nm. Use a Torx TX30 bit
and a torque screwdriver. Refer to Figure 8.
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Procedure
Figure 8
The Mounting Screws
5. Reconnect the left and right power connectors. Push in the power
connectors until the latches click. Refer to Figure 9.
The LOD PFM has only one power cable (on the left-hand side).
If the PFM does not start correctly, contact Ericsson support.
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Replacing a Power and Fan Module in BFD 538
Figure 9
PFM Power Connectors
6. Replace the dust filter sheet in the front cover and the lower dust filter, see
the instruction, Replacing the Dust Filters in BFD 538.
7. Install the front cover in the subrack and push it into its original position.
8. Make sure that the locking handles are locked against the cut-out in the
subrack frame, by pressing the handles first up and then down. Refer to
Figure 10.
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Procedure
Figure 10
Locking Handles for the Front Cover
9. Remove the ESD connection and take off the ESD wrist strap.
10. Send back the faulty PFM to an Ericsson repair center. This is not
mandatory.
3.3
Performing Concluding Routines
1. Collect all tools.
2. If the replaced Power and Fan Unit is not yet packed, pack it using the
existing packing material.
3. Close and lock the cabinet front door.
4. Complete the work order and any necessary report.
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Glossary
Glossary
ESD
Electrostatic Discharge
HOD
High-Ohmic Distribution
LOD
Low-Ohmic Distribution
PFM
Power and Fan Module
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