01-09 Replacing the Cabinet Components

9 Replacing the Cabinet ComponentsAbout This Chapter

The BTS3012AE cabinet components are the fan box, AC lightning arrester, built-in batteries,external batteries, fan filter unit, water sensor, smoke sensor, door status sensor, and temperatureand humidity sensor.

9.1 Replacing the Fan Box of a BTS3012/BTS3012AE CabinetThe fan box of the BTS3012/BTS3012AE cabinet is installed in the fan subrack of the cabinet.During the replacement of the fan box, the temperature inside the BTS may increase. Anovertemperature alarm may be reported, but the services carried on the BTS are not affected.9.2 Replacing the AC Lightning ArresterThe AC lightning arrester is placed in the AC power distribution subrack. It provides lightningprotection for the BTS input AC power. Replacing the AC lightning arrester interrupts all theservices carried by the BTS.9.3 Replacing the Built-In BatteriesThe batteries are optional. They can be placed in either the built-in battery cabin or the extensionbattery cabinet. When the built-in battery is replaced, the ongoing services are disrupted if thecabinet is powered off. If the cabinet is not powered off, the ongoing services are not affected.9.4 Replacing the External BatteriesThe batteries are optional. They can be placed in either the built-in battery cabin or the extensionbattery cabinet. Replacing the external storage batteries does not affect system services.9.5 Replacing the Water SensorThe BTS3012AE water sensor is placed at the bottom of the cabinet. It gives an alarm when itdetects water. Replacing a water sensor does not affect system services.9.6 Replacing the Smoke SensorThe BTS3012AE smoke sensor is placed at the bottom of the cabinet. It gives an alarm when itdetects smoke in the cabinet. Replacing a smoke sensor does not affect system services.9.7 Replacing the Door Status SensorThe BTS3012AE door status sensor monitors whether the front or rear door of the cabinet isopen. Replacing a door status sensor does not affect system services.9.8 Replacing the Temperature and Humidity Sensor

BTS3012AESite Maintenance Guide(for FFU) 9 Replacing the Cabinet Components

Issue 01 (2007-09-10) Huawei Technologies Proprietary 9-1

The BTS3012AE temperature and humidity sensor is placed at the bottom of the cabinet. Itmonitors the temperature and the humidity inside the cabinet. Replacing a temperature andhumidity sensor does not affect system services.9.9 Replacing the Fan Filter UnitThe fan filter unit is installed in the inner side of the front door of the cabinet. If the fan filterunit is damaged, you need to replace it with a new one. Replacing the fan filter unit may causea temperature alarm and severely affect the running of the BTS.

9 Replacing the Cabinet ComponentsBTS3012AE

Site Maintenance Guide(for FFU)

9-2 Huawei Technologies Proprietary Issue 01 (2007-09-10)

9.1 Replacing the Fan Box of a BTS3012/BTS3012AE CabinetThe fan box of the BTS3012/BTS3012AE cabinet is installed in the fan subrack of the cabinet.During the replacement of the fan box, the temperature inside the BTS may increase. Anovertemperature alarm may be reported, but the services carried on the BTS are not affected.

Prerequisitel A new fan box is ready.l You have confirmed the position and the version of the fan box.l You have marked the installation positions of the cables on the fan box.l You have arranged the required tools, including a screwdriver, cutting plier, ESD wrist

strap, and the key to the front door of the cabinet.

ContextThe replacement of the fan box takes about three minutes.

CAUTIONTake correct ESD prevention measures, such as wearing an ESD wrist strap or ESD gloves, toavoid static damage to boards, modules, and electronic components.

CAUTIONAfter the operation, remove the ESD wrist strap, arrange its line, and place it on the zig strap ofthe air filter inside the door of the cabinet. Confirm that the cables and parts are in position. TheESD wrist strap must not be connected to the ESD jack when you close the door. Otherwise, thedoor will get stuck by the ESD wrist strap and the ESD wrist strap or the cabinet door will bedamaged.

ProcedureStep 1 Power off the fan box.

If... Then...

The power-off is performed in the BTS3012, Set the MCB FAN on the busbar to OFF.

The power-off is performed in theBTS3012AE,

Set the MCB FAN on the DC powerdistribution box to OFF.

Step 2 Remove the cables from the panel.



Pull out the COM and the PWR connectors.Step 3 Remove the faulty fan box.

1. Loosen the four screws fixing the fan box.2. Press the black button on the upper side of the panel to reveal the pulling eye.3. Pull out the fan box one-third of its length.4. Hold the fan box with the other hand and then pull out the fan box.

Step 4 Install a new fan box.1. Hold the fan box and put it into the subrack.2. Push the fan box until it is secure.3. Fix the pulling eye on the panel.4. Tighten the four screws fixing the fan box.

Step 5 Install cables to the panel.Install the cables according to the marked installation positions.

Step 6 Power on the fan box.

If... Then...

The power-off is performed in the BTS3012 Set the MCB FAN on the busbar to ON.

The power-off is performed in theBTS3012AE

Set the MCB FAN on the DC powerdistribution box to ON.

----End

PostrequisiteCheck the installed fan box. For details, refer to 7.1.4 Checking the Installed BTS3012/BTS3012AE Board.Handle the replaced fan box. For details, refer to 7.1.5 Handling the Replaced BTS3012/BTS3012AE Board and Module.

9.2 Replacing the AC Lightning ArresterThe AC lightning arrester is placed in the AC power distribution subrack. It provides lightningprotection for the BTS input AC power. Replacing the AC lightning arrester interrupts all theservices carried by the BTS.

Prerequisitel The new AC lightning arrester is ready.l The installation position of the cable for the AC lightning arrester is recorded.l The screwdriver, wrench, cutting pliers, ESD wrist strap, and keys to the doors of the cabinet

are ready.




ContextReplacing a AC lightning arrester takes approximately 30 minutes.


ProcedureStep 1 Turn off all the switches of the BTS and then cut off the BTS power supply.Step 2 Loosen the four M3 screws on the panel of the lightning protection filtering subrack and remove

the cover of the lightning arrester. You can see the external power cables and the wiringterminals.

Step 3 Record the installation positions of the cables for the AC lightning arrester. Then remove all thecables.

Step 4 Remove the captive screws on the AC lightning arrester.Step 5 Hold the AC lightning arrester and lift it along the slide rail. When the arrester is loosened,

remove it.Step 6 Push the new AC lightning arrester along the slide rail.Step 7 Reinstall the captive screws.Step 8 According to the recorded installation position, install the cables onto the new AC lightning

arrester.Step 9 Tighten the M3 screws on the front panel of the lightning protection and filtering subrack.

----End

PostrequisiteAfter replacing the AC lightning arrester, check the following:1. The power cables and grounding cables are properly connected.2. The related alarms on the maintenance terminal or the alarm system of the OMC are cleared.Contact local Huawei office to handle the faulty AC lightning arrester.

9.3 Replacing the Built-In BatteriesThe batteries are optional. They can be placed in either the built-in battery cabin or the extensionbattery cabinet. When the built-in battery is replaced, the ongoing services are disrupted if thecabinet is powered off. If the cabinet is not powered off, the ongoing services are not affected.



Prerequisitel The new built-in battery is ready.l The place and model of the to-be-replaced battery are ready.l The installation positions of the cables for the battery are recorded.l Tools such as screwdrivers, wrenches, cutting pliers, and ESD wrist straps are ready. And

the key to the door of the cabinet is ready.

ContextReplacing a battery takes approximately 40 minutes.The built-in batteries have two configuration modes: 100 AH and 200 AH. The procedure forreplacing the batteries in each configuration mode is the same.


DANGERDo not short-circuit the batteries during the replacement. The tools such as wrench andscrewdriver must have installation tubes. Otherwise the batteries may be damaged and causepersonnel injuries.

ProcedureStep 1 Based on the actual conditions, determine whether the cabinet should be powered off when the

built-in battery is replaced.

If... Then...

The services can be disrupted, Go to Step 2.

The services cannot be disrupted, Go to Step 4.

Step 2 Set the switches on the DC power distribution box to OFF.Step 3 Set the four switches on the AC power distribution box to OFF, and then go to Step 5.Step 4 Use a little stick to press the button in the little hole beside the OFF silkscreen on the panel of

the DPMU and hold on for more than five seconds until you hear a sound, indicating that thebattery contactor is disconnected.




NOTE

If there is no click sound after you press the button for more than ten seconds, you can infer that the storagebatteries are in the OFF state.

Step 5 Set the BAT switch under the common subrack of the BTS3012AE to OFF.Step 6 Loosen the M3 screws on the 50 AH and 150 AH battery cabins and remove the panels. Figure

9-1 shows the wiring of the storage batteries.

Figure 9-1 Wiring of the 200 AH Storage Batteries

-48V/- RTN/+60

120

Step 7 Remove the insulation tubes on the wiring posts of the batteries, and then remove the cablesbetween the batteries and the wiring copper bar on the left of the 50 AH battery cabin.

Step 8 Remove the batteries from the 50 AH battery cabin.1. Remove the insulation tubes on the wiring posts of the front batteries, and then remove the

cables between the batteries.2. Remove the front batteries.3. Remove the insulation tubes on the wiring posts of the back batteries, and then remove the

cables between the batteries.4. Remove the back batteries.

Step 9 Remove the batteries on the upper layer of the 150 AH battery cabin.1. Remove the insulation tubes on the wiring posts of the front batteries, and then remove the

cables between the batteries.2. Remove the front batteries.



3. Remove the insulation tubes on the wiring posts of the back batteries, and then remove thecables between the batteries.

4. Remove the back batteries.Step 10 Install a new battery and the cables by referring to Installing Storage Batteries and Cables.Step 11 Install the panels of the battery cabins and tighten the screws.Step 12 Determine whether the cabinet can be powered off.

If... Then...

The services can be disrupted, Go to Step 15.

The services cannot be disrupted, Go to Step 13.

Step 13 Set the BAT switch under the common subrack of the BTS3012AE to ON.Step 14 Use a little stick to press the button in the little hole beside the ON silkscreen on the panel of

the DPMU and hold on for more than five seconds until the battery is powered on.NOTE

If there is no click sound after you press the button for more than ten seconds, check whether the cableconnections of the battery are correct, and whether the battery is faulty. Rectify the fault. Then, thereplacement is complete.

Step 15 Power on the FAN box and check whether the fan runs normally.

If... Then...

The fan runs normally, Go to Step 16.

The fan runs abnormally, Rectify the fault and then go to Step 16.

Step 16 Set in turn the switches on the DC power distribution box to ON.Step 17 Set in turn the four switches on the AC power distribution box to ON.Step 18 Set the BAT switch under the common subrack of the BTS3012AE to ON.

----End

PostrequisiteAfter replacing the batteries, check the following:1. The cables for the external battery cabinet are properly connected.2. The BAT switch under the common subrack of the BTS3012AE is set to ON.Contact local Huawei office to handle the old batteries.




9.4 Replacing the External BatteriesThe batteries are optional. They can be placed in either the built-in battery cabin or the extensionbattery cabinet. Replacing the external storage batteries does not affect system services.

Prerequisitel The new external battery is ready.l The place and model of the to-be-replaced battery are ready.l The installation positions of the cables for the battery are recorded.l The screwdriver, wrench, cutting pliers, ESD wrist strap, and keys to the doors of the cabinet

are ready.

ContextReplacing a battery takes approximately 40 minutes.


ProcedureStep 1 Set the BAT switch under the common subrack of the BTS3012AE to OFF.Step 2 Open the front door of the external battery cabinet.Step 3 Mark the installation positions of the cables for the external battery cabin, and then remove all

the cables.Step 4 Remove the barrier and the old batteries layer by layer. Use a screwdriver to unscrew the screws

that fix the barrier and remove the barrier, a shown in Figure 9-2. Take out the batteries andplace them in a safe place.



Figure 9-2 Removing the Barriers

1(1) Barrier

CAUTIONl Remove the barriers and batteries from the top layer to the bottom layer. After removing the

barrier on a layer, you must remove the battery on this layer, and then remove the barrier onthe lower layer.

l Use both hands when replacing the batteries and keep the batteries from dropping whenremoving them.

Step 5 Install the new batteries and barriers layer by layer.




CAUTIONInstall the batteries and barriers from the bottom layer to the top layer. After installing the batteryon a layer, you must install the barrier on this layer, and then install the battery on the upperlayer.

Step 6 Record the installation positions of the Installing the BTS3012AE Cables.Step 7 Close the front door of the external battery cabinet.Step 8 Set the BAT switch under the common subrack of the BTS3012AE to ON.

----End

PostrequisiteAfter replacing the batteries, check the following:1. The cables for the batteries are properly connected.2. The BAT switch under the common subrack of the BTS3012AE is set to ON.Contact local Huawei office to handle the old batteries.

9.5 Replacing the Water SensorThe BTS3012AE water sensor is placed at the bottom of the cabinet. It gives an alarm when itdetects water. Replacing a water sensor does not affect system services.

Prerequisitel A new water sensor is ready.l The model of the to-be-replaced water sensor is known.l The installation position of the cable for the water sensor is recorded.l The screwdriver, wrench, cutting pliers, ESD wrist strap, and the key to the door of the

cabinet are ready.

ContextReplacing a water sensor takes approximately 40 minutes.


ProcedureStep 1 Use the diagonal pliers to cut the cable tie that binds the faulty water sensor.



Step 2 Pull out the plug of the faulty water sensor from the NPMI.Step 3 Remove the faulty water sensor.Step 4 Take out the new water sensor and insert its connector to the NPMI.Step 5 Bind the cable for the new water sensor after the replacement is successful.

----End

PostrequisiteAfter replacing the water sensor, check whether the related alarms on the Site MaintenanceTerminal System or the OMC are cleared.Contact local Huawei office to handle the faulty water sensor.

9.6 Replacing the Smoke SensorThe BTS3012AE smoke sensor is placed at the bottom of the cabinet. It gives an alarm when itdetects smoke in the cabinet. Replacing a smoke sensor does not affect system services.

Prerequisitel A new smoke sensor is ready.l The model of the to-be-replaced smoke sensor is known.l The installation position of the cable for the smoke sensor is recorded.l The screwdriver, wrench, cutting pliers, ESD wrist strap, and the key to the door of the

cabinet are ready.

ContextReplacing a smoke sensor takes approximately 10 minutes.


ProcedureStep 1 Remove the smoke sensor anticlockwise.Step 2 Loosen the two screws that fix the smoke sensor base. Remove the smoke sensor base.Step 3 Loosen the metal clips that crimp the cable terminals. Pull out the cable terminals.Step 4 Install the cable terminals onto the smoke sensor base. Figure 9-3 shows the connection between

cables and the smoke sensor base. The red cable is the live wire and the white cable is the groundwire.




Figure 9-3 Smoke sensor base

3

12

4

2

GND

1

3

4

(1) Cable for the smoke sensor (2) Cable crimping clip for the smoke sensor(3) Mounting hole on the smoke sensor base (4) Smoke sensor base

Step 5 Install the new smoke sensor onto the base clockwise.----End

PostrequisiteAfter replacing the smoke sensor, check whether the related alarms on the Site MaintenanceTerminal System or the OMC are cleared.Contact local Huawei office to handle the faulty smoke sensor.

9.7 Replacing the Door Status SensorThe BTS3012AE door status sensor monitors whether the front or rear door of the cabinet isopen. Replacing a door status sensor does not affect system services.

Prerequisitel A new door status sensor is ready.l The model of the to-be-replaced door status sensor is known.l The installation position of the cable for the door status sensor is recorded.l The screwdriver, wrench, cutting pliers, ESD wrist strap, and the key to the door of the

cabinet are ready.

ContextThe BTS3012AE door status sensors consist of the front door status sensor and the rear doorstatus sensor. The structures and installation procedures of these two kinds of sensors aredifferent.l The front door status sensor is fixed using screws.l The rear door status sensor is fixed on a panel.Replacing a door status sensor takes approximately 10 minutes.




Procedurel Replacing the door status sensor

1. Open the front door. Loosen the two screws that fix the sensor and then remove it, asshown in Figure 9-4.

Figure 9-4 Front door status sensor

1

(1)Mounting hole for the front door status sensor

2. Mark the installation positions of the cables for the door status sensor and removethese cables.

3. Connect the cables to the wiring terminals on the new door status sensor.4. Use captive screws to install the new door status sensor onto the door status sensor

support.l Replacing the rear door status sensor

1. Loosen the screws that fix the rear door and remove it.2. Press the two buckles on the two sides of the rear door status sensor and remove the

door status sensor from the cabinet, as shown in Figure 9-5.




Figure 9-5 Rear door status sensor

1

(1)Buckle on the rear door status sensor

3. Mark the installation positions of the cables for the rear door status sensor. Removethese cables.

4. Connect the cables to the wiring terminals on the new rear door status sensor.5. Install the new rear door status sensor onto the door status sensor support.

----End

PostrequisiteAfter replacing the door status sensor, check whether the related alarms on the Site MaintenanceTerminal System or the OMC are cleared.Contact local Huawei office to handle the faulty door status sensor.

9.8 Replacing the Temperature and Humidity SensorThe BTS3012AE temperature and humidity sensor is placed at the bottom of the cabinet. Itmonitors the temperature and the humidity inside the cabinet. Replacing a temperature andhumidity sensor does not affect system services.

Prerequisitel A new temperature and humidity sensor is ready.l The model of the to-be-replaced temperature and humidity sensor is known.l The installation position of the cable for the temperature and humidity sensor is recorded.l The screwdriver, wrench, cutting pliers, ESD wrist strap, and the key to the door of the

cabinet are ready.

ContextReplacing a temperature and humidity sensor takes approximately 10 minutes.




ProcedureStep 1 Open the front door. Use fingers or tools to press the buckles on the temperature and humidity

sensor and remove it.Step 2 Loosen the three screws that fix the temperature and humidity sensor base and remove it, as

shown in Figure 9-6.

Figure 9-6 Temperature and humidity sensor

1

3

2

(1) Temperature and humiditysensor cover

(2) Temperature and humiditysensor base

(3) Screw fixing the temperatureand humidity sensor base

Step 3 Use the flathead screwdriver to loosen the crimping screws that fix cables on the temperatureand humidity sensor base. Mark the installation positions for these cables. Remove the cablesfor temperature and humidity sensor.

Step 4 Install the cables onto the wiring terminals on the new temperature and humidity sensor base.Tighten the cables using a flathead screwdriver.

Step 5 Use captive screws to install the new temperature and humidity sensor base onto the cabinet.----End




PostrequisiteAfter replacing the temperature and humidity sensor, check whether the related alarms on theSite Maintenance Terminal System or the OMC are cleared.Contact local Huawei office to handle the faulty temperature and humidity sensor.

9.9 Replacing the Fan Filter UnitThe fan filter unit is installed in the inner side of the front door of the cabinet. If the fan filterunit is damaged, you need to replace it with a new one. Replacing the fan filter unit may causea temperature alarm and severely affect the running of the BTS.

Prerequisitel A new fan filter unit is ready.l The required tools, such as the screwdriver, cutting pliers, ESD wrist strap, and key to the

front door of the cabinet, are ready.

ContextNOTE

Generally, the life cycle of a fan filter unit is three years. It takes about 10 minutes to replace a fan filterunit.Take correct ESD prevention measures, such as wearing an ESD wrist strap or ESD gloves, to avoid staticdamage to boards, modules, and electronic components.

CAUTIONAfter the operation, remove the ESD wrist strap, arrange its line, and place it on the zig strap of the airfilter inside the door of the cabinet. Confirm that the cables and parts are in position. The ESD wrist strapmust not be connected to the ESD jack when you close the door. Otherwise, the door will get stuck by theESD wrist strap and the ESD wrist strap or the cabinet door will be damaged.

CAUTIONAfter the operation, remove the ESD wrist strap, arrange its line, and place it on the zig strap of the airfilter inside the door of the cabinet. Confirm that the cables and parts are in position. The ESD wrist strapmust not be connected to the ESD jack when you close the door. Otherwise, the door will get stuck by theESD wrist strap and the ESD wrist strap or the cabinet door will be damaged.

ProcedureStep 1 Remove the four long screws on the door lock side and uncover the door shell.Step 2 Remove the shutter.Step 3 Uncover the shell of the fan filter unit.



Step 4 Remove the original fan filter unit.Step 5 Install a new fan filter unit.Step 6 Install the shell of the fan filter unit.Step 7 Install the shutter.Step 8 Fasten the four long screws and recover the door shell.

----End




9 Replacing the Cabinet Components9.1 Replacing the Fan Box of a BTS3012/BTS3012AE Cabinet9.2 Replacing the AC Lightning Arrester9.3 Replacing the Built-In Batteries9.4 Replacing the External Batteries9.5 Replacing the Water Sensor9.6 Replacing the Smoke Sensor9.7 Replacing the Door Status Sensor9.8 Replacing the Temperature and Humidity Sensor9.9 Replacing the Fan Filter Unit

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01-09 Replacing the Cabinet Components