BusinessPhone Communication Platform 5.1

## Power Supply with Battery Charger BP 250 BML 351 048

General
Unpacking
BML 351 048 and the integrated battery unit BKB 201 001
BML 351 048 and battery cabinet BKB 201 002
Locations
Installation
Installing the integrated battery unit BKB 201 001
Installing the battery cabinet BKB 201 002
Alarm connections
Start-up the exchange
Replacing the BML unit
BML 351 048 mounted on an exchange cabinet
Battery replacement
Replacing the integrated battery unit BKB 210 001
Replacing batteries in the battery cabinet BKB 201 002
Alarm connection
Electrical connection
Battery data
Integrated battery unit
Battery cabinet

## General

This document describes the installation and replacement of:

- power supply with battery charger BML 351 048,
- integrated battery unit (BKB 210 001) and
- battery cabinet (BKB 210 002) in the systems ASB 150 01 and ASB 150 02.

The power supply is available as:

230 VAC 48V / 5A (BML 351 048) class I unit

The BML unit with safety class I acc. to EN 60 950 provides a protective earth connection from the mains outlet to the BML unit case and therefore has to be fastened to the cabinet with 4 self etching screws supplied together with the BML unit to make a sound ground connection.

The integrated battery unit can be used in small exchanges equipped with up to 6 circuit boards. The battery unit itself occupies slots 6 - 8.

The battery cabinet is intended for a larger installation with up to two exchange cabinets.

One BML unit can supply power for up to two exchange cabinets and a battery pack at the same time, provided the power requirements of the installed extension sets do not exceed the current rating of the BML unit.

Note

In case of configurations, which require a BML unit as well as a battery back up per cabinet, make sure that the cabinet 0 has always the highest current load. This measurement is necessary in order to secure that in case of a very long mains failure always the cabinet with the CPU-D_ goes down first.

For examples of power calculation, see document Installation Instructions (1531‑BDV 113 08 Uen).

The BML unit will always be mounted on the rear side of the cabinets BDV 113 08 and is connected to the system by cables supplied with each unit.

The BML unit can be used solely as a power supply for the exchange(s) independent of backup batteries.

The power cord is ordered as an individual item, in order to fit the mains plug deviations of each market.

## Unpacking

### BML 351 048 and the integrated battery unit BKB 201 001

The BML unit is delivered together with the integrated battery unit, the cables and other parts necessary for installation.

Before starting please verify that the delivered material is complete.

### BML 351 048 and battery cabinet BKB 201 002

On delivery the BML unit is already mounted on the back of the battery cabinet with the mechanics for the batteries installed in the cabinet. The cables and other parts necessary to install and connect the battery cabinet to the exchange are included in the delivery.

The batteries are not included with the battery cabinet and must be ordered separately.

Before starting the installation please make sure that the delivered material is complete.

## Locations

The switched mode power supply is available for applications demanding a higher current than supplied by the transformer and/or a battery backup for the PBX is required. This unit can also be used without battery backup.

Figure 1: Locations on BML 351 048

The physical connections on the BML 351 048 are listed below, together with a simple explanation of their purpose.

All connectors in the BML unit are keyed to prevent wrong cable connections.

- Batt is the 6-pin connector feeding the -48 VDC batteries in the battery cabinet or the integrated battery unit
- Btest/Alm is the output of the alarm relay inside the BML unit. The left part of the connector should be left free and supports Btest, which is a functionality prepared for future use.The right part of the connector provides the contacts for the alarm which closes the circuit during AC power outage
- D1 and D2 are the full rate -48 VDC outputs that feed the exchange cabinets, D3 is the -48 VDC output for auxiliary equipment e.g. IC-CU, IC-LU, ISDN NT if needed. This output is current limited to 2.0A
- Mains is connected via an IEC 320 C13 (17) input connector for the 230 VAC. This input has a mechanical locking for the straight power cord to prevent it from slipping off
- Fuse (T10A/250VAC) is the output fuse for D1 and D2
- F is a label stating the equipment, ratings serial number, production information, safety and CE marking.

Note

Mount the power supply unit securely to the cabinet with the supplied self-etching TORX screws .

Figure 2: Integrated battery unit BKB 201 001

The integrated battery unit provides the additional connections:

- H and I for the alarm cables.
- E is the polarity independent flat pin connection for the -48 V DC to the exchange.

This integrated battery unit is equipped with a circuit breaker to disconnect the batteries from the power supply unit.

Figure 3: Battery cabinet BKB 201 002

The battery cabinet provides the additional connections:

- H and I for the alarm cables.

Make the connections in the battery cabinet according to the wiring diagram below, using the supplied cables.

Note

WARNING: Take care when using metal non-insulated tools as the batteries deliver high currents in case of short circuit.

This unit is equipped with a circuit breaker disconnecting the batteries from the power supply unit.

## Installation

1. If the system is already installed and operating, inform the customer that your work is going to shut down his exchange.
2. Unscrew and remove the front cover from the exchange cabinet and note the position and connections of all boards.
3. Lower the bottom plate and switch OFF the power switch. Then remove the 36 VAC power cable, entering the bottom of the cabinet (E), coming from the transformer or similar equipment.
4. Note the position of the boards and remove them all. Position the BML unit so that the connectors are facing the bottom of the cabinet and the four mounting holes facing the back of the cabinet.
5. Slide the BML unit in at the back of the cabinet and secure it with the supplied four screws. For safety reasons on class I units verify that the screws are tightened to the cabinet as they ensure the connection to protective earth.
6. Connect the power cord to the BML unit and plug into mains. Connect cable TRE 990 113/0850 to one of the two four-pin outlets (D1 and D2) on the BML unit. It is good practice to measure the -48 volt (-54 volt) before installing the rest of the equipment.
7. Connect the other end with the flat-pin connectors (E) on the bottom of the cabinet. This is polarity independent.
8. Re-install all boards according to your notes of the initial configuration.
9. If you just had to install the BML 351 048 with no backup battery take the 6-pin plug delivered with the BML unit. Plug it into position (A) to prevent ESD discharges directly to the connector. Then switch the cabinet ON and start up the exchange (see Start-up the exchange). Otherwise continue with the installation of the appropriate battery backup.

### Installing the integrated battery unit BKB 201 001

1. Install the integrated battery unit in slot 6 of the cabinet. Set the circuit breaker to position OFF.
2. Plug the cable coming from the battery unit into the six-pin outlet (A) on the BML unit. Note that as soon as this cable is plugged in, and the circuit breaker is turned ON, 48 V are present in the system. Continue with Alarm connections or Start-up the exchange.

### Installing the battery cabinet BKB 201 002

1. The battery cabinet should be located in the leftmost position on the wall.

Note

Make sure the cabinet is 100% secured to the wall, since the batteries are very heavy.

1. Drill holes (4) and mount the wall bracket SXA 112 4406 on the wall. Hang the battery cabinet on the bracket and secure the cabinet with 2 screws at the bottom.
2. Set the circuit breaker to OFF position. Connect the batteries in series with the supplied cables and put the four batteries in the battery cabinet. Then connect the grey wire with the negative terminal and the red wire with the positive.

Note

WARNING: Take care when using metal non-insulated tools as the batteries deliver high short circuit currents.

1. Use cable TRE 990 113/0850 to connect the outlets (D1 and D2) of the BML unit with the connectors (E) on the bottom of the exchange cabinet(s).
2. Connect the battery cable (a) to the outlet (A) on the BML unit. Note that as soon as cable A is plugged in and the circuit breaker is ON, 48 V are present in the system if the switch is turned ON. Continue with Alarm connections or Start-up the exchange.

### Alarm connections

The alarm output (B) closes during mains power failure (see Figure 1: Locations on BML 351 048).

1. Connect the power supply alarm cable TRE 990 111/0400 to right part of outlet (B) on the BML unit, and the other end to one of the inputs (H or I) on the specific battery units.
2. Connect the free end of the alarm cable TRE 990 112/2000 to the MDF connector block (Yellow to a4 and Blue to b4).

To prevent electrostatic discharges (ESD) directly to the alarm connector pins use the enclosed plastic 2‑pin plug and plug it into output B when the alarm feature is not used.

### Start-up the exchange

1. Turn on the circuit breaker and switch ON the power in the cabinet. Observe that the system starts up correctly. If this is a new installation, start up the system according to the document Start of Operation (1537-ASB 150 02 Uen).
2. BMS provides the facility for measuring the secondary voltages. Use this feature to check the values of the -48V, +5V and +/- 12V in the system.
3. Raise the bottom plate, replace the front cover and tighten the two screws at the bottom of the front cover.
4. Remove all excess material and inform the customer that the system is back in operation.

## Replacing the BML unit

### BML 351 048 mounted on an exchange cabinet

1. Inform the customer that your work is going to stop his exchange for a while.
2. Unscrew and remove the front cover from the exchange cabinet. Note the position of the boards and cables.
3. Lower the bottom plate, turn OFF power and the circuit breaker on the battery unit.
4. Remove all cables and the boards from the exchange. Disconnect the power cord from the wall and from the BML unit.
5. Disconnect the three cables (A, B, C or D) from the BML unit that run to the system (do not disconnect the other end).
6. If installed, slide out the battery unit from the exchange cabinet. The cables connected to it, will follow the battery unit. Take off the back plane.
7. Unscrew the four screws in the back of the cabinet holding the BML unit.

Note

Releasing the last screw will let the BML unit drop out. Hold it from below and remove it by letting it slide down.

1. Position the new BML unit so that the connectors are located at the bottom and the four mounting holes are facing the back of the cabinet.
2. Slide the BML unit in at the rear of the cabinet and secure it with the four screws.
3. If available, install the battery unit by sliding it into slot 6 of the exchange cabinet.
4. Reconnect the three cables (A, B, C or D) disconnected under item 5.
5. Install the power cord and connect to mains. It is good practice to measure the -48 volt (-54 volt) before installing the rest of the equipment. Then turn on the circuit breaker.
6. Note that as soon as the cable is plugged in (A) and the circuit breaker is ON, the -48 V are present in the system.
7. If no battery backup unit is to be installed, an empty 6-pin connector, supplied with the unit, must be plugged in position (A) to prevent ESD discharges directly to the connector.

To prevent electrostatic discharges (ESD) directly to the alarm connector pins use the enclosed plastic 2-pin plug and plug it into output (B) when the alarm feature is not used.

1. The replacement of the BML unit is now completed. Reinstall the boards and cables. Turn on the power in the cabinet. Take care that the system starts up correctly.
2. Raise the bottom plate, replace the front cover and tighten the two screws at the bottom of the front cover.
3. Inform the customer that the system is in operation.

## Battery replacement

Battery replacement should be done while the system is in operation and running on mains.

Note

Batteries are a threat to the environment and should be handled with great care. Worn out batteries should be taken care of by recycling specialists.
Make sure they get them!

### Replacing the integrated battery unit BKB 210 001

The single batteries in the integrated battery unit are no field replaceable parts. To minimize service time replace the whole unit.

1. Unscrew and remove the front cover from the exchange cabinet.
2. Verify that the unit is running on mains then turn the circuit breaker of the battery unit OFF.
3. Disconnect the alarm cables (connectors (H) and (I)) but not the other cable end. Unplug the 6-pin connector (A) on the BML unit which feeds the battery unit.
4. It is now possible to slide out the battery unit and the 6-pin connector cable will follow the battery unit out.
5. Install the new battery unit by sliding it into slot 6 of the exchange cabinet.
6. Make sure the circuit breaker is in the OFF position and then replace the cables (H, I, A) removed under 3 and 4.
7. Turn the circuit breaker ON and observe that the exchange is still operating.
8. Raise the bottom plate, replace the front cover and tighten the two screws at the bottom of the front cover on the exchange cabinets.
9. The replacement of the integrated battery unit is now complete.

### Replacing batteries in the battery cabinet BKB 201 002

When replacing batteries, make sure that all batteries are replaced at the same time.

Note

WARNING: Take care when using metal non-insulated tools as the batteries deliver high currents in case of short circuit.

1. Unscrew and remove the front cover from the battery cabinet.
2. Make sure that the mains voltage is present, then turn OFF the circuit breaker in the front of the battery unit
3. Unplug the 6-pin connector (A) on the BML unit which feeds the battery unit.
4. Pull out the bottom right battery 4 cm and remove the cable connection on the plus terminal. Then proceed with the battery above and remove the minus terminal connection.
5. Continue with the batteries on the left and take off the interconnection cable.
6. Remove both batteries from the top and the bottom of the cabinet as they are connected together, replace them with new ones and re-install them in reverse manner. Reconnect the 6-pin connector to the BML unit.
7. Turn the circuit breaker ON and take care that the exchange continues operation.
8. Raise the bottom plate, replace the front cover and tighten the two screws at the bottom of the front cover on the cabinet.
9. The replacement of the batteries is now complete.

## Alarm connection

In case of mains failure the ALARM feature indicates that the system is running on battery power. The Ericsson standard I/O cable TSR 902 0444/1 carries all feature connections from the front connector of the CPU-D_ board to the MDF connection block.

Should the system already use some of the system features, (MUSIC input, ALARM output or TEMPERATURE SENSORS) such a cable has already been installed.

If the connection is to be done directly on the front of the CPU-D_ board, use cable TRE 990 112/3000 and connect the most positive wire (Yellow) to pin C22. The most negative (Blue) is to be connected to C24.

## Electrical connection

The cables required to connect the BML unit to the exchange and the battery units are listed below.

1. battery power cable. This cable is part of the battery unit or battery cabinet
2. power supply alarm cable TRE 990 111/0400
3. exchange power cable TRE 990 113/0850
4. exchange power cable TRE 990 113/0850 (a longer power cable TRE 990 113/1500 (1,5 m long) is available, if this cable is too short)
5. alarm cable TRE 990 112/3000
6. common MDF cable
7. mains cord (see ordering information)
   The plug must be straight style and moulded to the cord. For class II equipment use a plug of the type IEC 320 C17 and for class I equipment use a plug of the type IEC 320 C13.

## Battery data

### Integrated battery unit

The 8 batteries (BKC 850 007) in the integrated battery unit BKB 201 001 can be ordered separately, but the whole lot should be replaced at the same time.

Article number: |  | BKC 850 007 |
Voltage: |  | 6 V |
Capacity: |  | 2 Ah |

### Battery cabinet

When replacing batteries, make sure that all batteries are replaced at the same time. The batteries can be purchased from Ericsson with the ordering number BKC 851 003, or you can purchase the battery at a local vendor.

The batteries required should have the following ratings:

Article number: |  | BKC 851 003 |
Voltage: |  | 12 V |
Capacity: |  | min. 15 Ah |
Type: |  | VR (valve regulated) |
Size |  | L=181 mm H=167 mm W=76 mm |
The terminal should provide screw type connection.
Representative types: | VARTA accu-CF 12V/15 Ah |
HITACHI HP15-12 |
YUASA NP15-12 |

Revision: B © Ericsson Enterprise 2003