Tait TBAK2 Users Manual

4 Installation

This chapter describes how to install the TB8100 BSS in a standard 19 inch rack or cabinet. It also provides some general information on safety precautions and site requirements. We recommend that you read the entire chapter before beginning the installation.

4.1 Personal Safety

Lethal Voltages

Warning!! The PMU contains voltages that may be lethal.

Refer to the ratings label on the rear of the module.

The TB8100 BSS must be installed so that the rear of the PMU is located in a service access area. Disconnect the mains IEC connector and wait for five minutes for the internal voltages to self-discharge before dismantling.

The AC power on/off switch does not isolate the PMU from the mains. It breaks only the phase circuit, not the neutral.

The PMU should be serviced only by qualified technicians. All servicing should be carried out only when the PMU is powered through a mains isolating transformer of sufficient rating. We strongly recommend that the mains power to the whole of the repair and test area is supplied via an earth leakage circuit breaker.

Explosive Environments

Warning!! Do not operate TB8100 BSS equipment near

electrical blasting caps or in an explosive atmosphere. Operating the equipment in these environments is a definite safety hazard.

Proximity to RF Transmissions

Do not operate the transmitter when someone is standing within 90cm (3ft) of the antenna. Do not operate the transmitter unless you have checked that all RF connectors are secure.

TB8100 Installation and Operation Manual Installation 31 © Tait Electronics Ltd June 2003

High Temperatures

Take care when handling a PMU or PA which has been operating recently. Under extreme operating conditions (+60° C [+140° F] ambient air temperature) the external surfaces of the PMU and PA can reach temperatures of up to +80° C (+176°F).

4.2 Equipment Safety

ESD Precautions

Important This equipment contains devices which are susceptible to

damage from static charges. You must handle these devices carefully and according to the procedures described in the manufacturers’ data books.

We recommend you purchase an antistatic bench kit from a reputable manufacturer and install and test it according to the manufacturer’s instructions. Figure 4.1 shows a typical antistatic bench set-up.

You can obtain further information on antistatic precautions and the dangers of electrostatic discharge (ESD) from standards such as ESD S4.1-1997 (revised) or BS EN 100015-4 1994.

Figure 4.1 Typical Antistatic Bench Set-up

conductive wrist strap

to building ground or mains ground via 1M ohm series resistor

dissipative rubber bench mat

Aerial Load

The TB8100 BSS equipment has been designed to operate safely under a wide range of aerial loading conditions. However, we strongly recommend that the transmitter should always be operated with a suitable load to prevent damage to the transmitter output power stage.

32 Installation TB8100 Installation and Operation Manual

Equipment Grounding

To ensure safe operation the TB8100 BSS equipment must be correctly grounded as described in these installation instructions.

Installation and Servicing Personnel

The TB8100 BSS should be installed and serviced only by qualified personnel.

4.3 Regulatory Information

Distress Frequencies

The 406 to 406.1MHz frequency range is reserved worldwide for use by Distress Beacons. Do not program transmitters to operate in this frequency range.

FCC Compliance

This device complies with part 15 of the FCC Rules. Operation is subject to the condition that this device does not cause harmful interference.

Unauthorised Modifications

Any modifications you make to this equipment which are not authorised by Tait Electronics Ltd may invalidate your compliance authority’s approval to operate the equipment.

4.4 Environmental Conditions

Operating Temperature Range

The operating temperature range of the TB8100 BSS is –30°C to +60°C (–22°F to +140°F) ambient temperature. Ambient temperature is defined as the temperature of the air at the intake to the cooling fans.

Humidity

The humidity should not exceed 95% relative humidity through the specified operating temperature range.

TB8100 Installation and Operation Manual Installation 33 © Tait Electronics Ltd June 2003

Dust and Dirt

For uncontrolled environments, the level of airborne particulates must not exceed 100µg/m

4.5 Grounding and Lightning Protection

Electrical Ground

The TB8100 BSS modules are grounded by physical contact between the module case and the subrack. To ensure a good ground connection you must tighten each module retaining clamp securely (refer to “Final

Reassembly” on page 53 for the correct torque setting).

A threaded grounding connector is provided on the rear of the subrack for connection to the site ground point (refer to “Connection” on page 55 for more details).

Lightning Ground

It is extremely important for the security of the site and its equipment that you take adequate precautions against lightning strike. While it is outside the scope of this manual to provide comprehensive information on this subject, the following guidelines apply:

■ install a suitable lightning rod at the top of the tower and connect it to a

secure ground point with appropriate conductors and connectors

■ position site buildings and equipment within the cone of protection

provided by the grounded tower

■ protect all cables entering the site to prevent lightning energy from

entering site buildings.

4.6 Recommended Tools

It is beyond the scope of this manual to list every tool that an installation technician should carry. However, the following tools are specifically required for installing the TB8100 BSS:

■ Pozidriv PZ3 screwdriver for the M6 screws used to secure the subrack

to the rack or cabinet, and also for the DC input terminals on the PMU

■ Pozidriv PZ2 screwdriver for the M4 screws used to secure the module

retaining clamps

■ 0.25in or 6mm flat blade screwdriver for the fasteners used to secure the

front panel to the subrack

■ 8mm AF spanner for the SMA connectors.

34 Installation TB8100 Installation and Operation Manual

You can also obtain the TBA0ST2 tool kit from your nearest Tait Dealer or Customer Service Organisation. It contains the basic tools needed to install, tune and service the TB8100 BSS.

4.7 Ventilation

Always ensure there is adequate ventilation around the TB8100 BSS. Do not operate it in a sealed cabinet. You must keep the ambient temperature

within the specified range, and we strongly recommended that you ensure that the cooling airflow is not restricted.

Important The cooling fans are mounted on the front panel and will

only operate when the panel is fitted correctly to the front of the subrack. To ensure adequate airflow through the BSS, do not operate it for more than a few minutes with the front panel removed (e.g. for servicing purposes).

Ambient Air Temperature Sensor

The ambient air temperature reading for the TB8100 BSS is provided by the ambient air temperature sensor PCB

b fitted to the PA control PCB.

The sensor PCB is inserted through slots in the control PCB and heatsink to be positioned between the heatsink fins.

Important If the sensor PCB is to provide accurate ambient tempera-

ture readings, it must have forced airflow and must not come into contact with the metal of the heatsink fins. Do not stack PAs with the fins together. It is possible for the fins on one heatsink to slide between the fins on the other heatsink. This can damage the sensor PCB, and possibly result in the heatsink fins becoming locked together.

TB8100 Installation and Operation Manual Installation 35 © Tait Electronics Ltd June 2003

Cabinet and Rack Ventilation

Refer to Figure 4.2 on page 37.

The cooling airflow for the TB8100 BSS enters through the front panel and exits at the rear of the subrack. For optimum thermal performance, the heated air that has passed through a BSS must not be allowed to re-enter the air intakes on the front panel. Any space at the front of the cabinet not occupied by equipment should be covered by a blanking panel.

To allow enough cooling airflow through a cabinet-mounted BSS, we recommend the following:

■ an area of at least 150cm

in front of the air intakes for the fans for each subrack; for example, thirty 6x 85 mm (0.25x 3.3in) slots will allow the recommended airflow

■ a vent in the top of the cabinet with an area of approximately 150cm

■ a 2U gap at the top of the cabinet.

(23in

) per subrack, or a similar area of ventilation per subrack at the rear

of the cabinet behind each subrack

(23in2) of unrestricted ventilation slots or holes

Auxiliary Extractor Fans

Note The ventilation opening must be unrestricted. If the slots or holes

are covered with a filter, mesh or grille, the open area must be increased to allow the same airflow as an unrestricted opening.

The maximum ambient temperature entering the cabinet must not exceed +60°C (+140°F).

If the TB8100 BSS is installed in a rack or cabinet with other equipment with different ventilation requirements, we recommend that the TB8100 be positioned below this equipment.

The TB8100 BSS does not require auxiliary extractor fans mounted in the top of the cabinet. If your cabinet is already fitted with fans, the following procedures apply:

■ if there are six or more 120mm (4.75in) fans, each capable of extracting

■ if there are fewer than six fans, you must remove them and ensure the

160m

per hour (94.2CFM), they must run continuously

vent in the top of the cabinet has an area of approximately 150cm

(23in

) per subrack.

If you have any other configuration, the performance of your system will depend on how closely you comply with the TB8100 BSS airflow requirements described above.

36 Installation TB8100 Installation and Operation Manual

Figure 4.2 Typical Cabinet Ventilation Requirements

20cm (8in)

top view

side view

≥ 17.5cm (≥ 7in)

front view

ventilation slots

blanking panels

TB8100 Installation and Operation Manual Installation 37 © Tait Electronics Ltd June 2003

airflow entry

airflow exit

4.8 Installing the Base Station System

Caution A TB8100 subrack complete with modules can

weigh up to 28kg (62 lb), or up to 30 kg (66 lb) complete with packaging. We recommend that you remove the modules from the subrack before moving the equipment, or have another person help you with the lifting. In all cases follow safe lifting practices.

Unpacking the Equipment

Unpacking the TB8100 BSS

Figure 4.3 Unpacking the TB8100 BSS

The TB8100 BSS is packed in a strong corrugated cardboard carton with top and bottom foam cushions. To prevent personal injury and damage to the equipment, we recommend that two people unpack the BSS.

ghi

1. Rotate the carton carefully onto its side

2. Cut the tape securing the flaps at the bottom of the carton and fold them flat against the sides

38 Installation TB8100 Installation and Operation Manual

b and then onto its top c.

3. Rotate the carton carefully onto its side e, and then onto its bottom

f, ensuring that none of the flaps is trapped underneath.

4. Slide the carton upwards over the foam cushions and lift it away

5. Remove the cushion from the top of the BSS

Disposal of Packaging

If you do not need to keep the packaging, we recommend that you recycle it according to your local recycling methods. The foam cushions are CFCand HCFC-free and may be burnt in a suitable waste-to-energy combustion facility, or compacted in landfill.

Mounting the Subrack

Caution We recommend that you remove the modules from

Figure 4.4 Subrack Mounting Points

out of the other cushion

the subrack before lifting it (refer to “Replacing

Modules” on page 43), or have another person help

you with the lifting.

h and then lift the BSS

front view

rear view

main mounting holes - front

auxiliary mounting holes - rear

1. Remove the front panel, as described in “Preliminary Disassembly”

on page 43.

2. Fit the subrack into the cabinet or rack and secure it firmly with an M6 screw, flat and spring washer in each of the four main mounting holes

Note If you need extra mounting security, there are additional mount-

Auxiliary Support Bracket

TBA2140 auxiliary support brackets can be fitted to the rear of the TB8100 subrack to provide additional mounting security. Figure 4.5 below shows a standard TBA2140 bracket If you are not using a Tait cabinet, you may have to make your own brackets to suit your installation.

b, as shown in Figure 4.4 on page 39.

ing holes port brackets.

c provided at the rear of the subrack for auxiliary sup-

b fitted in a typical Tait Electronics cabinet c.

Figure 4.5 Auxiliary Support Bracket

Important Yo u must fit the auxiliary support brackets if you intend to

transport a cabinet fitted with a fully built-up TB8100 BSS.

We also recommend that you fit the brackets under the following conditions:

■ when the installation is in an area prone to earthquakes

■ when third party equipment is installed hard up underneath the TB8100

BSS subrack.

40 Installation TB8100 Installation and Operation Manual

Optional Slide Mounting Rails

You can also use TBA2141 slide mounting rails b when mounting the TB8100 BSS in a cabinet, as shown in Figure 4.6 below. These rails will support the BSS while you slide it into the cabinet.

However, you must still secure the BSS to the cabinet with four M6 screws through the main mounting holes on the front of the subrack, as shown in

Figure 4.4 on page 39.

Figure 4.6 Optional Slide Mounting Rail - Rear View

Important The slide mounting rails are not suitable for transporting a

cabinet fitted with a fully built-up TB8100 BSS. In this case, you must also fit the TBA2140 auxiliary support brackets to the upper set of rear mounting holes

Cabling

General We recommend that you try to route all cables to and from the TB8100 BSS

along the side of the cabinet so the cooling airflow is not restricted.

DC Power Cabling DC power cables should be well supported so that the terminals on the

PMU and on the ends of the cables do not have to support the full weight of the cables.

Figure 4.7 below shows two recommended methods of securing these cables

to prevent straining either set of terminals.

Figure 4.7 DC Power Cabling

secure the cables to the cabinet to support their weight

42 Installation TB8100 Installation and Operation Manual