OPERATING INSTRUCTIONS 10/1543-LZA 701 6001 Uen K

OPERATING INSTRUCTIONS 10/1543-LZA 701 6001 Uen K

Replacing Fans and Climate Units

RBS 6102

Contents

1Introduction

1.1Prerequisites

2Replacing External Fans

2.1Removing an External Fan

2.2Installing an External Fan

2.3Performing Concluding Routines

3Replacing Internal Fans

3.1Removing an Internal Fan

3.2Installing an Internal Fan

3.3Performing Concluding Routines

4Replacing Heat Exchangers

4.1Removing a Heat Exchanger

4.2Installing a Heat Exchanger

4.3Performing Concluding Routines

5Replacing Temperature Sensor

5.1Removing a Temperature Sensor

5.2Installing a Temperature Sensor

5.3Performing Concluding Routines

6Replacing Heater

6.1Removing a Heater

6.2Installing a Heater

6.3Performing Concluding Routines

7Installing Extended Climate Units

7.1Installing an Extended Heat Exchanger

7.2Installing Extended External Fans

7.3Installing Extended Internal Fans

7.4Performing Concluding Routines

8Installing or Removing Wind Shield Covers

8.1Installing Wind Shield Covers

8.2Removing Wind Shield Covers

8.3Installing Previous Model of the Wind Shield Covers

8.4Removing Previous Model of Wind Shield Covers

9Performing Concluding Routines

Reference List

Copyright Ericsson AB 20092012. All rights reserved. No part of this document may be reproduced in any form without the written permission of the copyright owner.

DisclaimerThe 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.

Trademark ListAll trademarks mentioned herein are the property of their respective owners. These are shown in the document Trademark Information.

1 IntroductionThis instruction describes how to replace climate units in a Radio Base Station (RBS) 6102 and how to install new climate units for extended climate.

Note: To minimize traffic disturbances, perform replacement procedures during off-peak hours.

The climate units are located on top of the RBS as shown in Figure 1.

Figure 1 Position of Climate UnitsThe standard climate units are placed in the right bay of the cabinet while the extended climate units are added in the left bay.

The climate units are shown in Figure 1 as follows:

a. External fans

b. Internal fans

c. Heater

d. Heat exchanger

e. Temperature sensor

f. Support Control Unit (SCU)

More information on standard and extended climate units can be found in Climate Unit Description.

Information on how to replace the SCU can be found in Replacing Control Units.

The following two reasons exist for replacing a climate unit:

To replace a faulty unit

To upgrade the RBS with a newer version of a unit

For scheduled preventive maintenance

Information about how to install the extended climate units can be found in Section 7.

1.1 PrerequisitesThis section contains information on the documents, tools, and conditions that apply to these procedures.

1.1.1 DocumentsBefore going to site, ensure that the following documents are read and understood:

Personal Health and Safety Information

System Safety InformationSee Reference List for needed documents.

1.1.2 ToolsBefore starting this procedure, ensure that the tools listed in Table 1 are available for each corresponding climate unit.

Table 1 Tools Required

Product NameProduct NumberIncluded inClimate Unit

Electrostatic Discharge (ESD) wrist strapLTT 601 136/1Maintenance tool set (LTT 601 137/1) External fans

Internal fans

Heat exchanger

Temperature sensor

Heater

Ratchet wrench and 6 mm Hexagon bit External fans

Heat exchanger

Torx screwdriver, T20LSA 901 43/3 Internal fans

Heater

Temperature sensor

Torx screwdriver, T25LSA 901 43/4Internal fans

Torx screwdriver, T40LSA 901 43/7Heat exchanger

Lifting deviceAntenna System Installation Equipment (LTT 601 142/1)Heat exchanger

Lifting strapsHeat exchanger

2 x Lifting eyebolts, M10SAR 201 100/03Heat exchanger

Torque set, 0.54.0 NmLTT 601 145/1 Internal fans

Heat exchanger

Heater

Torque wrench, 525 NmLTT 601 140/1Heat exchanger

Hex keyWind shield cover

1.1.3 ConditionsBefore going to site, ensure that the following conditions are met:

A work order is available.

The operating instruction that referred to these instructions is available, if applicable.

A new unit is available.

All keys are available and site access is granted.

2 Replacing External FansThis section describes how to remove and install the external fans in the RBS. The position of the external fans is shown in Figure 1.

Fans are normally replaced while the RBS remains in operation.

Note: All fans must be replaced on the same occasion if the replacement is performed due to a scheduled preventive maintenance activity.

2.1 Removing an External Fan

Do!

Always use an approved ESD wrist strap when working with sensitive equipment. Damage to components mounted on printed board assemblies can occur if an ESD wrist strap is not used.

To remove the external fan, perform the following procedure:

1. Unpack the replacement fan and check that it is undamaged.

2. Inform the Operation and Maintenance Center (OMC) that work is to start at the node site. The OMC can then decide what measures are necessary to minimize service disruptions.

Note: If it concerns a multistandard RBS, it is important that all OMCs concerned are informed that work is about to start.

3. Open the cabinet door.

4. Put on the ESD wrist strap and connect the cable to the ESD earth grounding point on the cabinet.

5. On the side where the fan is to be replaced, disconnect all the external fans from the SCU. The external fans are connected to Fan Group 2 (standard climate) or Fan Group 4 (extended climate). More information can be found in Non-RF Connections.

6. Remove the three bolts inside the upper front of the cabinet. Use a 6 mm hexagon bit and a ratchet wrench.

7. Pull the cabinet roof towards the cabinet door a few centimeters, then lift it straight up and fasten it to the support rods.

8. Identify the fan to be replaced, if not replacing all fans.

9. On the side where the fan is to be replaced, disconnect all fan cable connectors by pushing the plastic latches outward to unseat the connectors.

Note: All three fan cables must be disconnected before proceeding.

10. Make sure that the fan blades on all fans have stopped, then slightly press down on the sides of the external foam layer and carefully tilt it forward a bit.

Note: The foam layer should be tilted just enough to reach the fan from behind.

11. Gently extract the fan from the foam layer as shown in the figure in Step 10.

12. Place the fan in an ESD bag and reuse the packing from the spare part.

13. Repeat Step 11 to Step 12 for each fan to be replaced.

2.2 Installing an External FanTo install the external fan, perform the following procedure:

1. Carefully tilt the external foam layer forward and gently insert the fan from behind.

Note: The fan cable should be routed back through the fan hole and fitted in the cutout in the foam.

2. Adjust the fan so that the cable connectors are pointing to one another.

Note: Make sure that the cable is placed so that it will not be destroyed by the fan blades.

3. Connect the fan cable by pulling the plastic latches on the connector inward so that it snaps into place.

4. Repeat Step 1 to Step 3 for each fan to be installed.

5. Gently push the foam layer into place.

6. Remove the support rods holding up the cabinet roof and gently pull the roof down.

7. Check that the cabinet roof is correctly in place.

8. Secure the cabinet roof in position using the three bolts at the front of the cabinet.

9. Tighten the bolts to a torque of 10 Nm.

10. Connect the fan cable to the SCU. The external fan cable is connected to Fan Group 2 (standard climate) or Fan Group 4 (extended climate). More information can be found in Non-RF Connections.

2.3 Performing Concluding RoutinesPerform the procedure in Section 9.

3 Replacing Internal FansThis section describes how to remove and install the internal fans in the RBS. The position of the internal fans is shown in Figure 1.

Fans are normally replaced while the RBS remains in operation. Replacement must therefore take place as quickly as possible to prevent the temperature rising and triggering alarms or even shutting down the RBS.

Note: All fans must be replaced on the same occasion if the replacement is performed due to a scheduled preventive maintenance activity.

3.1 Removing an Internal Fan

Do!

Always use an approved ESD wrist strap when working with sensitive equipment. Damage to components mounted on printed board assemblies can occur if an ESD wrist strap is not used.

To remove the internal fan, perform the following procedure:

1. Unpack the replacement fan and check that it is undamaged.

2. Inform the Operation and Maintenance Center (OMC) that work is to start at the site. The OMC can then decide what measures are necessary to minimize service disruptions.

Note: If it concerns a multistandard RBS, it is important that all OMCs concerned are informed that work is about to start.

3. Open the cabinet door.

4. Put on the ESD wrist strap and connect the cable to the ESD earth grounding point on the cabinet.

5. Identify the fan to be replaced.

6. Disconnect the internal fans from the SCU. The internal fans are connected to Fan Group 1 (standard climate) or Fan Group 3 (extended climate). More information can be found in Non-RF Connections.

Note: If replacing both standard and extended internal fans, do not disconnect all four fans from the SCU at the same time. Disconnect and replace two internal fans on one side first. The remaining two fans on the other side will prevent the temperature to rise and trigger alarms. Once the first two fans have been replaced, perform the same procedure for the other two fans.

7. When the fan wheels have stopped, loosen, but do not remove, the two screws on either side of the internal fan cover using a T20 Torx screwdriver and remove the fan cover .

8. Loosen, but do not remove, the two screws on the fan mounting bracket using a T25 Torx screwdriver.

9. Unhook the fan mounting bracket by turning it clockwise.

10. Unscrew the four screws on the fan mounting bracket using a T20 Torx screwdriver.

Note: Register the position of the cable in relation to the mounting bracket. This will facilitate the fastening of the replacement fan.

11. Gently remove the fan from the bracket.

12. Identify the product number of the fan. The product number starts with BKV 301 216/.

13. Place the fan in an ESD bag and reuse the packing from the spare part.

14. Repeat Step 5 to Step 13 for each fan to be removed.

3.2 Installing an Internal FanNote: When installing a standard internal fan make sure that the product number of the replacement fan is identical to the product number of the fan being replaced.

When installing an extended internal fan make sure that the product number of the fan is identical to the product number of the already installed standard internal fans.

To install an internal fan, perform the following procedure:

1. Place the fan in the mounting bracket and tighten the four screws with a T20 Torx screwdriver to a torque of 2.5 Nm.

2. Position the fan so that the two keyholes on the mounting bracket fit into the two screws on the cabinet.

3. Hook the mounting bracket over the screws and turn it counterclockwise until it is fastened.

Note: Make sure that the fan cable is pointing upwards to the hooks in the upper inside of the cabinet.

4. Tighten the screws on the mounting bracket using a T25 Torx screwdriver to a torque of 4 Nm.

5. Route the fan cable up and along the upper inside of the cabinet, to the SCU.

6. Repeat Step 1 to Step 5 for each fan to be installed.

7. Put the fan cover back on and tighten the screws to a torque of 2.5 Nm using a T20 Torx screwdriver.

8. Connect the cable to the SCU according to the SCU connection diagram on the internal fan cover (SCU port information). The internal fans are connected to Fan Group 1 (standard climate) or Fan Group 3 (extended climate). More information on cabling can be found in Non-RF Connections.

Note: The internal fans connected to Fan Group 1 (standard climate) must be connected according to the figure below.

9. Ensure that the fan is working correctly.

Note: The fan is working correctly when the green optical indicator on the SCU is on and the red and the yellow optical indicators are off.

3.3 Performing Concluding RoutinesPerform the procedure in Section 9.

4 Replacing Heat ExchangersThis section describes how to remove and install a heat exchanger in the RBS. The position of the heat exchangers is shown in Figure 1.

The heat exchanger is normally replaced while the RBS remains in operation. Replacement must therefore take place as quickly as possible to prevent the temperature rising and triggering alarms or even shutting down the RBS. It is therefore recommended to prepare the replacement heat exchanger as much as possible before the replacement takes place.

Note: The heat exchanger weighs up to 18 kg so a lifting device is recommended when replacing the unit.

Figure 2 shows the heat exchanger.

Figure 2 Heat ExchangerNote: When handling the heat exchanger, be careful not to damage the cooling coil fins on the inside of the heat exchanger. Damaged coil fins can reduce the cooling performance.

4.1 Removing a Heat Exchanger

Caution!

Tip risk! Unsecured equipment can tip over if not secured properly, causing injury to personnel. Secure products with a high center of gravity as soon as possible to avoid accidents.

Warning!

Overloading, or other wrong use of lifting devices, can cause serious injury to anyone hit by falling equipment. Do not create an angle exceeding 90 between lifting straps as this increases the strain on them and can cause them to snap.

Caution!

Rotating fan blades can cause injury to body parts that come into contact with the blades. Blades in fan units continue to rotate for a period of time, even after the fan has been switched off. Wait until fans have stopped rotating completely before starting work on or near fans.

To remove the heat exchanger, perform the following procedure:

1. Unpack the replacement heat exchanger and check that it is undamaged.

2. Inform the Operation and Maintenance Center (OMC) that work is to start at the site. The OMC can then decide what measures are necessary to minimize service disruptions.

Note: If it concerns a multistandard RBS, it is important that all OMCs concerned are informed that work is about to start.

3. Open the cabinet door.

4. Disconnect all the external fan cables from the SCU. The external fan cables are connected to Fan Group 2 (standard climate) and Fan Group 4 (extended climate). More information can be found in Non-RF Connections.

5. Remove the three bolts inside the upper front of the cabinet. Use a 6 mm hexagon bit and a ratchet wrench.

6. Pull the cabinet roof towards the cabinet door a few centimeters, then lift it straight up and remove it.

7. Disconnect the external fan cable connectors by pushing the plastic latches outward to unseat the connectors.

Note: All external fan cables must be disconnected before proceeding.

8. Remove the two screws on each side of the external fan frame using a T40 Torx screwdriver.

9. Lift the external fan frame straight up and remove it.

10. Remove the two screws on each side of the rear beam using a T40 Torx screwdriver.

11. Lift the rear beam straight up and remove it.

12. Loosen and remove the two M6 nuts on the lower edge of the heat exchanger using a 10 mm torque wrench.

13. If applicable, remove the two plastic plugs on top of the heat exchanger.

14. Insert two M10 eyebolts into the holes and tighten them finger-tight.

15. Thread the lifting strap through the eyebolts and connect it to a lifting device. Ensure that the strap is tight before continuing.

16. Position the lifting device.

17. For safety reasons, disconnect the internal fans according to the instructions in Section 3.1.

Note: The rotating fan blades can cause personal injury.

18. Lift the heat exchanger and carefully move it away from the cabinet.

19. Remove the lifting straps and the eyebolts on the heat exchanger.

Note: If applicable, put the plastic plugs back on the heat exchanger.

4.2 Installing a Heat Exchanger

Caution!

Tip risk! Unsecured equipment can tip over if not secured properly, causing injury to personnel. Secure products with a high center of gravity as soon as possible to avoid accidents.

Warning!

Overloading, or other wrong use of lifting devices, can cause serious injury to anyone hit by falling equipment. Do not create an angle exceeding 90 between lifting straps as this increases the strain on them and can cause them to snap.

Caution!

Rotating fan blades can cause injury to body parts that come into contact with the blades. Blades in fan units continue to rotate for a period of time, even after the fan has been switched off. Wait until fans have stopped rotating completely before starting work on or near fans.

To install the heat exchanger, perform the following procedure:

1. Make sure that the rubber gasket inside the cabinet is intact and fitted properly along the sides before proceeding.

2. If applicable, remove the plastic plugs on top of the heat exchanger, then insert M10 eyebolts and tighten them finger-tight.

3. Thread the lifting strap through the eyebolts and connect it to the lifting device. Ensure that the strap is tight before continuing.

4. Position the lifting device.

5. Connect the internal fans according to the instructions in Section 3.2.

6. Lift the heat exchanger and position it above the cabinet before carefully lowering it into place.

Note: Be careful not to damage the cooling elements underneath the heat exchanger.

7. When the heat exchanger is in place, remove the lifting strap and the M10 eyebolts. If applicable, put the plastic plugs back on top of the heat exchanger.

8. Insert the M6 nuts on the heat exchanger and tighten them using a 10 mm torque wrench to a torque of 9.8 Nm.

9. Insert the external fan frame and tighten the two T40 screws on each side to a torque of 10 Nm.

10. Insert the rear beam and tighten the two T40 screws on each side to a torque of 10 Nm.

11. Put the cabinet roof back on and reconnect all external fans following the instructions in Section 2.2.

12. Go to Section 4.3.

4.3 Performing Concluding RoutinesPerform the procedure in Section 9.

5 Replacing Temperature SensorThis section describes how to remove and install the temperature sensor in the RBS. The position of the temperature sensor is shown in Figure 3.

Figure 3 Temperature Sensor5.1 Removing a Temperature Sensor

Do!

Always use an approved ESD wrist strap when working with sensitive equipment. Damage to components mounted on printed board assemblies can occur if an ESD wrist strap is not used.

To remove the temperature sensor, perform the following procedure:

1. Unpack the replacement temperature sensor and check that it is undamaged.

2. Inform the Operation and Maintenance Center (OMC) that work is to start at the site. The OMC can then decide what measures are necessary to minimize service disruptions.

Note: If it concerns a multistandard RBS, it is important that all OMCs concerned are informed that work is about to start.

3. Open the cabinet door.

4. Put on the ESD wrist strap and connect the cable to the ESD earth grounding point on the cabinet.

5. Disconnect and remove the left internal fan on the right side of the cabinet, connected to Fan Group 1 following the instructions in Section 3.1.

When the left internal fan has been disconnected and removed, proceed to Step 6.

6. Unscrew the M4 screw holding the temperature sensor using a T20 Torx screwdriver.

7. Disconnect the temperature sensor from the SCU.

Note: Press the locking tab firmly to release the connector.

8. Remove the temperature sensor and the cable grommet.

9. Place the temperature sensor in an ESD bag and reuse the packing from the spare part.

5.2 Installing a Temperature SensorTo install the temperature sensor, perform the following procedure:

1. Thread the replacement temperature sensor through the hole in the cabinet.

Note: Ensure that the rubber grommet around the cable is mounted in its hole properly.

2. Fasten the temperature sensor on the inside of the cabinet and tighten the M4 screw with a T20 Torx screwdriver from the outside.

3. Connect the temperature sensor to the SCU.

More information can be found in Non-RF Connections.

Note: Firmly press until the cable connector snaps into place.

4. Reinstall the left internal fan following the instructions in Section 3.2.

5.3 Performing Concluding RoutinesPerform the procedure in Section 9.

6 Replacing HeaterThis section describes how to remove and install the optional heater in the RBS. The position of the heater is shown in Figure 1.

The heater is normally replaced while the RBS remains in operation. Replacement must therefore take place as quickly as possible to prevent the temperature rising and perhaps shutting down the RBS.

6.1 Removing a Heater

Do!

Always use an approved ESD wrist strap when working with sensitive equipment. Damage to components mounted on printed board assemblies can occur if an ESD wrist strap is not used.

Caution!

A heater, producing hot air, is in use in this equipment. Direct contact with hot air can lead to burns. When the heater is in operation, avoid close contact with the heater air evacuation vent.

To remove the heater, perform the following procedure:

1. Unpack the replacement heater and check that it is undamaged.

2. Inform the Operation and Maintenance Center (OMC) that work is to start at the site. The OMC can then decide what measures are necessary to minimize service disruptions.

Note: If it concerns a multistandard RBS, it is important that all OMCs concerned are informed that work is about to start.

3. Open the cabinet door.

4. Put on the ESD wrist strap and connect the cable to the ESD earth grounding point on the cabinet.

5. For an AC heater, disconnect the power cable on the PCU AC.

More information can be found in Non-RF Connections.

6. For a DC heater, disconnect the power cables on the PDUs.

More information can be found in Non-RF Connections.

7. Disconnect the signal cable on the SCU.

More information can be found in Non-RF Connections.

Note: Make sure that the heater has cooled off before proceeding. This can take up to 10 minutes.

8. Disconnect the two internal fans on the right side of the cabinet by unplugging the connectors from Fan Group 1 on the SCU. More information can be found in Non-RF Connections.

Note: Make sure that the fan wheels have stopped moving before proceeding.

9. Loosen, but do not remove, the two screws holding the right internal fan cover using a T20 Torx screwdriver and remove it.

10. Remove the cable ties to the SCU, the PCU AC (for AC heater), and the PDUs (for a DC heater).

11. Remove the two screws holding the heater in place, using a T20 Torx screwdriver, and carefully remove the heater.

12. Put the heater in an ESD bag and reuse the packing from the spare part.

6.2 Installing a HeaterTo install the heater, perform the following procedure:

1. Position the new heater on the cabinet and tighten the screws using a T20 Torx screwdriver to a torque of 1.5 Nm.

2. Strap the signal and power cables and route them to their proper location.

Note: Make sure that the straps do not interfere with the fan.

3. Connect the signal cables to the SCU according to the SCU connection diagram on the internal fan cover (SCU port information).

More information can be found in Non-RF Connections.

4. For an AC heater, connect the power cable to the PCU AC.

More information can be found in Non-RF Connections.

5. For a DC heater, connect the power cables to the PDUs.

More information can be found in Non-RF Connections.

6. Put the internal fan cover back and tighten the screws using a T20 Torx screwdriver to a torque of 2.5 Nm.

7. Connect the internal fan cables to Fan Group 1 on the SCU.

More information can be found in Non-RF Connections.

8. Ensure that the fans are working correctly.

Note: The fans are working correctly when the green optical indicator on the SCU is on and the red and the yellow optical indicators are off.

6.3 Performing Concluding RoutinesPerform the procedure in Section 9.

7 Installing Extended Climate UnitsThis section describes how to install the extended climate units in the RBS. The position of the extended climate units is shown in Figure 1.

More information about extended climate units can be found in Climate Unit Description.

Note: When ordering an extended climate unit include information about the R state of the cabinet to enable delivery of the correct fans.

Cabinet BFX 901 45/08 with R state R1 or below use fan BKV 301 216/129.

Cabinet BFX 901 45/08 with R state R4 or above use fan BKV 301 216/154.

The workflow of installing the extended climate units are as follows:

1. Install extended heat exchangers.

2. Install extended external fans.

3. Install extended internal fans.

4. Perform concluding routines.

7.1 Installing an Extended Heat Exchanger

Caution!

Tip risk! Unsecured equipment can tip over if not secured properly, causing injury to personnel. Secure products with a high center of gravity as soon as possible to avoid accidents.

Warning!

Overloading, or other wrong use of lifting devices, can cause serious injury to anyone hit by falling equipment. Do not create an angle exceeding 90 between lifting straps as this increases the strain on them and can cause them to snap.

To install the extended heat exchanger, perform the following procedure:

1. Unpack all the extended climate units. Check that all units are undamaged before proceeding.

2. Inform the Operation and Maintenance Center (OMC) that work is to start at the site. The OMC can then decide what measures are necessary to minimize service disruptions.

Note: If it concerns a multistandard RBS, it is important that all OMCs concerned are informed that work is about to start.

3. Open the cabinet door.

4. Disconnect the standard external fan cables from the SCU. The external fan cables are connected to Fan Group 2 (standard climate). More information can be found in Non-RF Connections.

5. Remove the three bolts inside the upper front of the cabinet. Use a 6 mm hexagon bit and a ratchet wrench.

6. Pull the cabinet roof towards the cabinet door a few centimeters, then lift it straight up and remove it.

7. Disconnect the external fan cable connectors by pushing the plastic latches outward to unseat the connectors.

Note: All three fan cables must be disconnected before proceeding.

8. Remove the two screws on each side of the external fan frame using a T40 Torx screwdriver.

9. Lift the external fan frame straight up and remove it.

10. Remove the two screws on each side of the rear beam using a T40 Torx screwdriver.

11. Lift the rear beam straight up and remove it.

12. Unscrew the three screws holding the cover plate on the rear beam using a T20 Torx screwdriver. Remove the cover plate.

Note: The cover plate will not be needed for extended climate.

13. Loosen and remove the two M6 nuts on the external climate dummy inside the cabinet using a 10 mm torque wrench. Remove the external climate dummy.

14. Loosen and remove the screw holding the bracket dummy plate using a T20 Torx screwdriver. Coax the bracket dummy plate off.

15. When the dummies are removed, install the heat exchanger following the instructions in Section 4.2 , that is from Step 1 in Section 4.2 to Step 10 in Section 4.2.

Note: Do not put back the cabinet roof. The cabinet roof should be put back when the extended external fans have been installed.

16. Proceed to Section 7.2 .

7.2 Installing Extended External Fans

Do!

Always use an approved ESD wrist strap when working with sensitive equipment. Damage to components mounted on printed board assemblies can occur if an ESD wrist strap is not used.

To install the extended external fans, perform the following procedure:

1. Put on the ESD wrist strap and connect the cable to the ESD earth grounding point on the cabinet.

2. Remove the foam layer on the left side of the external fan frame.

3. Insert the new foam layer, that is, the foam with the fan-shaped holes, in the external fan frame.

4. Install the external fans following the instructions in Section 2.2, that is from Step 1 in Section 2.2 to Step 5 in Section 2.2.

5. To put back the cabinet roof, place the roof on top of the cabinet as shown for position 1. Push the cabinet backward into its final position as shown for position 2.

6. Check that the cabinet roof is correctly in place.

7. Secure the cabinet roof in position using the three bolts at the front of the cabinet.

8. Tighten the bolts to a torque of 10 Nm.

9. Connect the fan cables to the SCU. The extended external fan cables are connected to Fan Group 4. More information can be found in Non-RF Connections.

10. Proceed to Section 7.3.

7.3 Installing Extended Internal Fans

Do!

Always use an approved ESD wrist strap when working with sensitive equipment. Damage to components mounted on printed board assemblies can occur if an ESD wrist strap is not used.

To install the extended internal fans, perform the following procedure:

1. Loosen but do not remove the screws holding the two internal fan dummies using a T25 Torx screwdriver. Remove the internal fan dummies.

2. Position the internal fan air guide on top of the two screw holes and tighten the screws to a torque of 2.5 Nm using a T20 Torx screwdriver.

3. Install the internal fans following the instructions in Section 3.2.

7.4 Performing Concluding RoutinesPerform the procedure in Section 9.

8 Installing or Removing Wind Shield CoversThis section describes how to install and remove the wind shield covers in the RBS. Wind shield covers are mainly used in windy climates to protect and shield the RBS.

The wind shield covers can be installed and removed while the RBS remains in operation.

The positions of the wind shield covers are shown in Figure 4.

Figure 4 Wind Shield Covers on the RBSThere are two models of wind shield covers, the latest model and the previous one.

The latest wind shield covers consist of the following parts, as seen Figure 5:

One wind shield cover plate, including two fastening screws with washers

Two adapter plates each, including two fastening screws and two rectangular nuts

Figure 5 Front and Back Wind Shield Covers with Nuts, Adapters, Plates, Washers and ScrewsFor instructions on installing and removing the latest model, see Section 8.1 and Section 8.2.

For instructions of the previous model, see Section 8.3 and Section 8.4.

8.1 Installing Wind Shield CoversTo install the wind shield covers, perform the following procedure:

1. Inform the Operation and Maintenance Center (OMC) that work is to start at the site. The OMC can then decide what measures are necessary to minimize service disruptions.

Note: If it concerns a multistandard RBS, it is important that all OMCs concerned are informed that work is about to start.

2. Unpack the wind shield covers and check that all parts are undamaged.

Note: If the adapters are fastened on the wind shield cover, loosen the screws on the adapters using a T25 Torx screwdriver.

Note: To avoid the risk of dropping the screw; do not unscrew the screw completely, only loosen enough so that the adapter is removable.

3. Mark the holes on the RBS roof according to Figure 6 (front) and Figure 7 (back) to facilitate the installation of the wind shield cover.

Note: The markings show where the upper nut on each adapter should be attached. It is highly important that the nut on each adapter is fitted in the exact hole as shown in Figure 6 and Figure 7.

Figure 6 Front Wind Shield Cover

Figure 7 Back Wind Shield Cover4. Fit the nuts on each adapter into the matching holes on the cabinet according to Figure 6 (front) and Figure 7(back).

5. Loosen the screw using a T20 Torx enough until the nut moves and reaches a vertical position.

Note: The screw and nut is made captive. Do not try to unscrew the screw and the nut completely. If the nut accidentally falls off on the inside of the front or back plate it might be impossible to retrieve the nut.

6. Tighten the nut to a torque of 3 Nm using a T20 Torx screwdriver.

Note: Make sure that the nut stays in vertical position and can be seen through the hole on the adpater. To facilitate the tightening of the nut use a screwdriver or something appropriate to hold the nut in vertical position.

7. Do step 4 and 5 for the lower nut on each adapter.

Note: Make sure that the adapter is in a straight vertical position on the cabinet.

8. Hook the wind shield cover onto the adapters.

Note: For easy mounting, tilt the wind shield cover when hooking onto the adapters.

9. Tighten the screw and the washer on the wind shield plate onto the adapter to a torque of 6 Nm using a T25 Torx screwdriver.

10. Do step 4 to 8 for the other wind shield cover.

11. Perform the procedure in Section 98.2 Removing Wind Shield CoversTo remove the wind shield covers perform the following procedure:

1. Loosen the two screws on the wind shield cover enough to remove it from the adapters using a T25 Torx screwdriver.

2. Loosen the screws and nuts on the adapter enough to remove the on each adapters using a T20 Torx screwdriver.

8.3 Installing Previous Model of the Wind Shield CoversTo install the wind shield covers, perform the following procedure:

1. Inform the Operation and Maintenance Center (OMC) that work is to start at the site. The OMC can then decide what measures are necessary to minimize service disruptions.

Note: If it concerns a multistandard RBS, it is important that all OMCs concerned are informed that work is about to start.

2. Unpack the wind shield covers and check that all parts are undamaged.

Note: If the brackets and plates are fastened on the wind shield cover, unscrew the brackets using a T20 Torx screwdriver.

3. To facilitate the installation of the wind shield cover, mark the holes on the RBS roof according to Figure 8 (front) and Figure 9 (back).

Note: It is recommended to install one wind shield cover at the time.

Figure 8 Front Wind Shield Cover

Figure 9 Back Wind Shield CoverIt is highly important that the hooks on each brackets are fitted in the exact hole as shown in Figure 8 and Figure 9.

Note: The markings show where the upper hooks on each bracket should be attached.

4. Fasten the upper hooks on each bracket into the matching holes on the cabinet roof according to Figure 8 (front) or Figure 9 (back). The hook ends should point to the left. Adjust the bracket by slightly pushing it to the left.

5. Loosely fasten the upper hexagon bolt on the bracket using a wrench.

Note: The plate should be inserted between the two bolts on the bracket.

6. Insert the plate from below and push the plate upwards so that it fits between the two bolts.

7. When the plate is in position, tighten both bolts on the bracket.

8. Repeat Step 4 to Step 7 for each bracket.

Note: Use the markings from Step 3 and Figure 8 (front) and Figure 9 (back) to know exactly where to attach the bracket.

9. Lift up the wind shield cover and align the holes on the cover so that they match the screw holes on the brackets.

10. Insert the screws and tighten them with a hex key.

8.4 Removing Previous Model of Wind Shield CoversTo remove the wind shield covers perform the following procedure:

1. Unscrew all screws on the wind shield cover using a hex key and remove it.

Note: Be careful when unscrewing the wind shield cover so that it doesn't fall down.

2. Unscrew the bolts on each brackets using a 10 mm wrench and remove the brackets with corresponding plates.

3. Perform the procedure in Section 9.

9 Performing Concluding RoutinesFollow the instructions in the work order or the operating instruction that refers to this document.

Before leaving the site, perform the following procedure:

1. Ensure that the RBS is operational and that no alarms are active.

Information about optical indicators can be found in Indicators, Buttons, and Switches.

Note: Reaching final indicator status can take up to 30 minutes.

2. If applicable, save the configuration backup.

3. Disconnect the ESD wrist strap.

4. Collect all tools.

5. Inform the OMC that work is finished at the node site.

6. Close and lock the cabinet.

7. Complete the work order.

8. Follow the procedures for the return and disposal of replacement parts and the disposal of packing. Information about how to handle faulty equipment is described in Handling Faulty Equipment.

Safety

[1] Personal Health and Safety Information, 124 46-2885

[2] System Safety Information, 124 46-2886

Reference ListGeneric

[3] Climate Unit Description, 20/1551-LZA 701 6001

[4] Handling Faulty Equipment, 2/1541-LZA 701 6001

[5] Hardware Maintenance Instructions, 3/1541-LZA 701 6001

[6] Indicators, Buttons, and Switches, 19/1551-LZA 701 6001

[7] Non-RF Connections, 16/1551-LZA 701 6001

[8] Non-RF Connections (RBS 6102 without CBU) 16/1551-LZA 701 6001-V1

Replacing Fans and Climate Units RBS 6102