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Communications Systems | PLN‑1P1000 Plena Power Amplifier The PLN-1P1000 is a powerful 1000 W power amplifier in a 3U high 19” case for rack mounting or tabletop use. LEDs on the front panel show the status of the amplifier: power, audio output level, and supervised functions. This high-performance unit fulfills a wide range of public address requirements at a surprisingly low cost. Functions Dependability The amplifier is protected against overload and short circuits. A temperature-controlled fan ensures high reliability at high output levels, and low acoustic noise at lower output levels. An overheat protection circuit switches off the power stage and activates an LED on the front panel, if the internal temperature reaches a critical limit due to poor ventilation or overload. The unit operates both on mains power and on a 24 V battery power supply for emergency back up, with automatic switchover. For emergency and evacuation use, the following functions are monitored: mains presence, battery present, pilot tone presence, amplifier operation. Front panel LEDs indicate the status of supervised functions. The of pilot tone supervision and battery status LEDs can be switched off for general public address use. Failsafe (normally energized) relays are provided for each supervised function. These relays are always active regardless of the switches on the rear panel. Input The system has two balanced inputs with priority control, each with a loop-through facility. This makes it easy to connect remote systems that require priority control. An additional 100 V line input can connect the amplifier to a 100 V loudspeaker line, to provide more power to remote locations. Output The amplifier has 70 V and 100 V outputs for constant voltage loudspeaker systems, and a low impedance output for 8 ohm loudspeaker loads. A meter with LED-bar shows the output level. The PLN-1P1000 has two separate priority controlled 100 V outputs for zones that only need announcements made via the priority input, and for zones that will not get any announcements made via the priority input. Controls and indicators Front LED level meter Battery operation LED Overheat LED Back Power button Mains switch PLN‑1P1000 Plena Power Amplifier 1000 W power amplifier in a 3U high housing 70 V / 100 V and 8 ohm outputs Dual inputs with priority switching 100 V input for slave operation on 100 V speaker line Temperature-controlled forced front-to-back ventilation, directly stackable Mains, battery back-up and pilot tone supervision www.boschsecurity.com

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  • Communications Systems | PLN‑1P1000 Plena Power Amplifier

    The PLN-1P1000 is a powerful 1000 W power amplifier ina 3U high 19” case for rack mounting or tabletop use.LEDs on the front panel show the status of the amplifier:power, audio output level, and supervised functions. Thishigh-performance unit fulfills a wide range of publicaddress requirements at a surprisingly low cost.

    Functions

    DependabilityThe amplifier is protected against overload and shortcircuits. A temperature-controlled fan ensures highreliability at high output levels, and low acoustic noise atlower output levels. An overheat protection circuitswitches off the power stage and activates an LED on thefront panel, if the internal temperature reaches a criticallimit due to poor ventilation or overload.

    The unit operates both on mains power and on a 24 Vbattery power supply for emergency back up, withautomatic switchover.

    For emergency and evacuation use, the followingfunctions are monitored: mains presence, battery present,pilot tone presence, amplifier operation. Front panel LEDsindicate the status of supervised functions. The of pilottone supervision and battery status LEDs can be switchedoff for general public address use. Failsafe (normally

    energized) relays are provided for each supervisedfunction. These relays are always active regardless of theswitches on the rear panel.

    InputThe system has two balanced inputs with priority control,each with a loop-through facility. This makes it easy toconnect remote systems that require priority control. Anadditional 100 V line input can connect the amplifier to a100 V loudspeaker line, to provide more power to remotelocations.

    OutputThe amplifier has 70 V and 100 V outputs for constantvoltage loudspeaker systems, and a low impedance outputfor 8 ohm loudspeaker loads. A meter with LED-bar showsthe output level.

    The PLN-1P1000 has two separate priority controlled 100V outputs for zones that only need announcements madevia the priority input, and for zones that will not get anyannouncements made via the priority input.

    Controls and indicatorsFront

    • LED level meter• Battery operation LED• Overheat LEDBack

    • Power button• Mains switch

    PLN‑1P1000 Plena Power Amplifier▶ 1000 W power amplifier in a 3U high housing▶ 70 V / 100 V and 8 ohm outputs▶ Dual inputs with priority switching▶ 100 V input for slave operation on 100 V speaker line▶ Temperature-controlled forced front-to-back

    ventilation, directly stackable

    ▶ Mains, battery back-up and pilot tone supervision

    www.boschsecurity.com

  • 2 | PLN‑1P1000 Plena Power Amplifier

    InterconnectionsBack

    • Priority line input 1 (XLR/balanced)• Line loop-through 1 (XLR/balanced)• Program line input 2 (XLR/balanced)• Line loop-through 2 (XLR/balanced)• Priority controlled loudspeaker outputs• 24 VDC power supply terminal• Three loudspeaker direct outputs• Two 100 V slave inputs• Input 1 enable control terminal• Input 2 priority control terminal• Earth connection screw• Mains socket

    Certifications and Approvals

    Region Certification

    Europe CE

    Poland CNBOP

    Safety acc. to EN 60065

    Immunity acc. to EN 55103-2

    Emission acc. to EN 55103-1

    Emergency acc. to EN 54‑16 / EN 60849

    Parts Included

    Quantity Component

    1 PLN-1P1000 Plena Power Amplifier

    1 Power cord

    1 Set of 19" mounting brackets

    1 Installation and User Instructions

    Technical Specifications

    Electrical

    Mains power supply

    Voltage 230 VAC, ±10%, 50/60 Hz

    Inrush current 16 A

    Max power consumption 2200 VA

    Battery power supply

    Voltage 24 VDC +15% / -15%

    Current max 48 A

    Performance

    Output power (rms/maximum) 1000 W / 1500 W

    Power reduction on backuppower

    -1 dB

    Mains power supply

    Frequency response 50 Hz to 20 kHz (+1/-3 dB at -10 dBref. rated output)

    Distortion 90 dB

    Line inputs 2 x

    Connector 3-pin XLR, balanced

    Sensitivity 1 V

    Impedance 20 kohm

    CMRR >25 dB (50 Hz to 20 kHz)

    Gain 40 dB

    100 V input

    Connector Screw, unbalanced

    Sensitivity 100 V

    Impedance 330 kohm

    Line loop-through output 2 x

    Connector 3-pin XLR

    Nominal level 1 V

    Impedance Direct connection to line input

    Loudspeaker outputs 3 x

    Connector Screw, floating

    Direct output 100 V, 70 V, 8 ohm

    Priority only (from input 1) 100 V or 70 V internally selectable

    Music (non-priority) only 100 V or 70 V internally selectable

    Power consumption

    Mains operation

    Max power 2200 W

    -3dB 1472 W

    -6dB 1058 W

    Pilot tone* 345 W

    Idle 115 W

    24 VDC operation

    Max power 62 A (1500 W)

    -3 dB 34 A (823 W)

    -6 dB 25 A (597 W)

    Pilot tone* 7.6 A (182 W)

    Idle 1.5 A (36 W)

    * 20 kHz -20dB with maximum loudspeaker load

    Mechanical

    Dimensions (H x W x D) 145 x 430 x 430 mm(19" wide, 3U high, with feet)

    Weight Approx. 32 kg

    Mounting Standalone, 19” rack

    Color Charcoal

  • Installation and User Instructions

    Plena Power Amplifieren

    Plena Power Amplifiers

  • Bosch Security Systems | 2006-11 | 9922 141 50751en

    Plena Power Amplifier | Installation and User Instructions | Important Safeguards en | 2

    Important Safeguards

    Prior to installing or operating this product, always read the Important Safety Instructions which are available as a separate document (9922 141 7014x). These instructions are supplied together with all equipment that can be connected to the mains.

    Thank you for choosing a Bosch Security Systems product.

  • Bosch Security Systems | 2006-11 | 9922 141 50751en

    Plena Power Amplifier | Instalation and User Instructions | Table of contents en | 3

    Table of contents

    Important Safeguards ..................................................................................................................................................2Table of contents ...........................................................................................................................................................3

    1. Introduction ....................................................................................................................................................................51.1 Purpose .......................................................................................................................................................................51.2 Digital document .......................................................................................................................................................51.3 Intended audience ....................................................................................................................................................51.4 Related documentation ............................................................................................................................................51.5 Alerts ..........................................................................................................................................................................51.6 Signs ...........................................................................................................................................................................51.7 Conversion tables .....................................................................................................................................................6

    2. System Overview ..........................................................................................................................................................72.1 Plena ...........................................................................................................................................................................7

    3. Amplifiers ........................................................................................................................................................................93.1 Introduction ...............................................................................................................................................................93.2 Controls, connectors and indicators .......................................................................................................................93.3 Internal setting .........................................................................................................................................................113.4 Installation ...............................................................................................................................................................123.5 External connections ..............................................................................................................................................12

    4. Supervision .................................................................................................................................................................. 174.1 Input pilot tone .......................................................................................................................................................174.2 Battery supervision .................................................................................................................................................174.3 Mains supervision ...................................................................................................................................................17

    5. Operation ..................................................................................................................................................................... 195.1 ON and OFF ...........................................................................................................................................................195.2 Technical data .........................................................................................................................................................20

  • Bosch Security Systems | 2006-11 | 9922 141 50751en

    Plena Power Amplifier | Installation and User Instructions | Introduction en | 5

    1 Introduction

    1.1 PurposeThe purpose of the Installation and User Instructions is to provide information that is required to install, configure and operate a Plena Power Amplifier.

    1.2 Digital documentThe Installation and User Instructions are also available as a digital document in the Adobe Portable Document Format (PDF). All references to pages, figures, tables, etc. in this digital document contain hyperlinks to the referenced location.

    1.3 Intended audienceThe Installation and User Instructions are intended for installers and users of a Plena system.

    1.4 Related documentationThe following related documents are available:• Plena Voice Alarm System Basic System Manual

    (9922 141 1036x).

    1.5 AlertsIn this manual, four types of alerts are used. The alert type is closely related to the effect that may be caused when it is not observed. These alerts - from least severe effect to most severe effect - are:• Note

    Alert containing additional information. Usually, not observing a note alert does not result in damage to the equipment or personal injuries.

    • CautionThe equipment can be damaged if the alert is not being observed.

    • WarningPersons can be (severely) injured or the equipment can be seriously damaged if the alert is not being observed.

    • DangerNot observing the alert can result in death.

    1.6 SignsExcept for note alerts, the nature of the effect that can be caused when the alert is not observed, is indicated using a sign. For note alerts, the sign provides more information about the note itself. In this manual, the following signs are used in combination with alerts:

    NoteGeneral sign for notes.

    NoteConsult the indicated source of information.

    Caution, Warning, DangerGeneral sign for cautions, warnings and dangers.

    Caution, Warning, DangerRisk of electric shock.

    Caution, Warning, DangerRisk of electrostatic discharges.

  • Bosch Security Systems | 2006-11 | 9922 141 50751en

    Plena Power Amplifier | Installation and User Instructions | Introduction en | 6

    1.7 Conversion tablesIn this manual, SI units are used to express lengths, masses, temperatures etc. These can be converted to non-metric units using the information provided below.

    table 1.1: Conversion of units of length1 in = 25.4 mm 1 mm = 0.03937 in1 in = 2.54 cm 1 cm = 0.3937 in1 ft = 0.3048 m 1 m = 3.281 ft1 mi = 1.609 km 1 km = 0.622 mi

    table 1.2: Conversion of units of mass1 lb = 0.4536 kg 1 kg = 2,2046 lb

    table 1.3: Conversion of units of pressure1 psi = 68.95 hPa 1 hPa = 0.0145 psi

    Note1 hPa = 1 mbar.

    °F 95--- °C 32+⋅=

    °C 59--- °F 32( )⋅=

  • Bosch Security Systems | 2006-11 | 9922 141 50751en

    Plena Power Amplifier | Installation and User Instructions | System Overview en | 7

    2 System Overview

    2.1 PlenaThe Plena Power Amplifier is part of the Plena product range. Plena provides public address solutions for places where people gather to work, worship, trade or simply enjoy themselves. It is a family of system elements that are combined to create public address systems tailored for virtually any application. The range includes mixer, pre, system and power amplifiers, a source unit, digital message manager, feedback suppressor, conventional and PC call stations, an ‘All-in-One’ system and a voice alarm system. Each element is designed to complement all others thanks to matched acoustical, electrical and mechanical specifications.All Plena Power Amplifiers are designed to comply with IEC 60849 compliant systems.

  • Bosch Security Systems | 2006-11 | 9922 141 50751en

    Plena Power Amplifier | Installation and User Instructions | Amplifiers en | 9

    3 Amplifiers

    3.1 IntroductionThe Plena Power Amplifier range consists of four mono amplifiers:• 120 W LBB1930/20: 2 units high• 240 W LBB1935/20: 2 units high• 480 W LBB1938/20: 3 units high• 1000 W PLN-1P1000: 3 units high.In this manual all illustrations show either the LBB1938 power amplifier that is 3 units high or the LBB1935 power amplifier that is 2 units high. All connections are the same between the different power amplifiers.These power amplifiers have 70 V and 100 V constant voltage outputs and a low impedance output for 8 Ohm loudspeakers. Two inputs, priority and input 2 give priority and controlled outputs. A 100 V slave input gives connection to existing loudspeaker lines. The line inputs are balanced and have a loopthrough facility.The amplifiers have overload and short-circuit protection. A temperature controlled fan and overheat protection gives high reliability.Battery operation with automatic switch-over from the mains supply is available.

    3.2 Controls, connectors and indicators

    3.2.1 Front panel connectors and indicators

    See figure 3.1 for an overview of the indicators:1 VU meter - LED’s for 20, 6, 0 dB and power ON.2 Pilot-Tone - Supervised function that monitors a

    20kHz pilot tone.3 Battery - Supervised function to indicate battery

    operation.4 Mains - Supervised function to indicate mains

    supply.5 Overheat - Supervised function to give warning of

    overheating.6 Air inlet - Cooling is made by a forced ventilation

    from front to back. Amplifiers can be stacked on top of each other. A supply of cool air from the front is necessary.

    figure 3.1: Front panel LBB1938/20

    0 dB

    -6 dB

    -20 dB

    Battery OverheatMainsPilot-Tone

    Status

    Plena Booster Amplifier

    1

    3 4 52 6

  • Bosch Security Systems | 2006-11 | 9922 141 50751en

    Plena Power Amplifier | Installation and User Instructions | Amplifiers en | 10

    3.2.2 Rear panel connectors and indicators

    See figure 3.2 for an overview of the controls, connections and indicators:1 Priority line - input 1 (XLR/balanced)2 Level control - input 13 Line loopthrough 1 (XLR/balanced)4 Program line - input 2 (XLR/balanced)5 Level control - input 26 Line loopthrough 2 (XLR/balanced)7 Priority controlled loudspeaker output

    terminals8 24 Vdc power supply terminals9 Earth connection screw10 Mains fuse (T10A)11 Mains connector (3-pole)

    12 ON - OFF switch13 Voltage selector14 Loudspeaker direct output terminals15 Battery detection16 Fault relay output17 Pilot-Tone detection18 100 V slave input terminals19 Input 2 enable control terminals20 Input 1 priority control terminals

    figure 3.2: Rear panel LBB1930/20, LBB1935/20

    Priority Only No Priority

    100V 0 1 00V 0Priority Controlled Output

    Off On

    24V DCIn

    Apparatus deliveredconnectored for 230V~

    Main PowerBatteryInput

    Fault Relays' Output

    NO COM NC Off OnNO COM NC NO COM NC

    Input 1 Priority

    Loopthrough 1

    Input 2 Program

    Loopthrough 2

    Input 1 Priority2...24V- Input 10V- Input 2

    Input 2 Enable2..24V- Enable0V- Mute

    100V

    0S lave Input 100V

    +

    +

    -

    -

    100V0

    70V

    0

    8ohm

    100V/70VS election (12A)

    Priority Only0

    0No Priority

    Priority

    F701

    F702

    BatteryPower

    DetectionPilot-toneDetector

    230V~ 240V~

    Design & QualityThe Netherlands

    LBB 1938/10

    NL-4827HG-10

    Plena 480W Power AmplifierMax. output power 720WRated output power 180W230V~,50/60HzS/N.

    8900 193 81001

    A035413

    Mad

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    N663

    Rated inputPower : 1600VA

    Input 1Priority

    Slave Input100V

    Input 2Enable

    100V 0 100V 70V0 0 8Direct Output

    InputInput

    Input 2-ProgramInput 1-Priority

    2..24VDefault Off

    GND 2..24VDefault On

    GND

    2 3 4 5 6 9

    14

    10

    11

    12

    1 7 8

    131617181920 15

  • Bosch Security Systems | 2006-11 | 9922 141 50751en

    Plena Power Amplifier | Installation and User Instructions | Amplifiers en | 11

    3.3 Internal settingThe output voltage of the priority controlled loudspeaker outputs can be set to 70 V or 100 V. A high power fuse inside the unit is used as a voltage selector.Insert the high power fuse into fuse holder F701 for 100 V selection (default setting), or into fuse holder F702 for 70 V selection. This selection does not affect the output voltage of the loudspeaker direct outputs. Refer to figure 3.3.

    figure 3.3: Internal fuse setting LBB1930/20, LBB1935/20, LBB1938/20

    F701 100V

    70VF702

    figure 3.4: Internal fuse setting 1P1000

    F701 100V

    70VF702

  • Bosch Security Systems | 2006-11 | 9922 141 50751en

    Plena Power Amplifier | Installation and User Instructions | Amplifiers en | 12

    3.4 InstallationThe power amplifier is suitable for table-top and 19-inch rack-mounting installation. Two brackets for rack-mounting are supplied. See figure 3.5 for installation details.

    The power amplifier has an internal fan regulated to keep the temperature inside the unit within the safe operating condition.

    3.5 External connections

    3.5.1 Connect the back-up power supply

    The power amplifier has a 24 Vdc input (8) screw terminal to connect a back-up power supply. You must connect an earth (9) to the unit to increase the electrical stability of the system.

    figure 3.5: Brackets for rack-mounting

    0 dB-6 dB

    -20 dB

    Plena Booster Amplifier

    figure 3.6: Back-up power supply

    100V 0100V 0

    Priority Controlled Output 24V DCIn

    Apparatus deliveredconnectored for 230V~

    Main Power

    Batteryt

    elays' Output

    NC

    Off On

    NO COM NC NO COM NC

    100V0

    70V0

    8ohm

    100V/70VSelection (12A)

    Priority Only0

    0No Priority

    Priority

    F7

    01

    F7

    02

    Battery

    Power

    Detection230V~ 240V~

    Rated inputPower : 1600VA

    100V70V

    00 8

    Direct Output

    100V 01 00V 0

    Priority Controlled Output

    Off On

    24V DCIn

    Apparatus deliveredconnectored for 230V~

    Main Power

    BatteryInput

    Fault Relays' Output

    NO COM NC

    Off On

    NO COM NC NO COM NC

    Input 1 PriorityLoopthrough 1Input 2 ProgramLoopthrough 2Input 1 Priority2...24V- Input 10V- Input 2Input 2 Enable2..24V- Enable0V- Mute

    100V

    0

    S lave Input 100V

    +

    +

    -

    -

    100V0

    70V0

    8ohm

    100V/70VSelection (12A)

    Priority Only0

    0No Priority

    Priority

    F7

    01

    F7

    02

    Battery

    Power

    Detection

    Pilot-toneDetector

    230V~ 240V~

    Design & QualityThe Netherlands

    LBB 1938/10

    NL-4827HG-10

    Plena 480W Power AmplifierMax. output power 720WRated output power 180W230V~,50/60HzS/N.

    8900 193 81001

    A035413

    Mad

    ein

    Chin

    a

    N663

    Rated inputPower : 1600VA

    Input 1Priority Slave Input100V

    Input 2Enable

    100V 0

    100V70V

    00 8

    Direct Output

    Input

    Input

    Input 2-Program

    Input 1-Priority

    2..24VDefault Off

    GND 2..24VDefault OnGND

    12 VDC

    12 VDC

    -+

    -+

    9

    8

  • Bosch Security Systems | 2006-11 | 9922 141 50751en

    Plena Power Amplifier | Installation and User Instructions | Amplifiers en | 13

    3.5.2 Connecting line input and loopthrough

    The power amplifier has a balanced line input for connection to a pre-amplifier or a mixer. Use the loopthrough connection to connect the power amplifier to another power amplifier if more power is needed. Each power amplifier must be connected to its own set of loudspeakers. Do not connect power outputs to each other.Use program line - input 2 (4) and line loopthrough 2 (6) for normal operation without priority.

    figure 3.7: Line input and loopthrough

    100V 01 00V 0

    Priority Controlled Output

    Off On

    24V DCIn

    Apparatus deliveredconnectored for 230V~

    Main Power

    BatteryInput

    Fault Relays' Output

    NO COM NC

    Off On

    NO COM NC NO COM NC

    Input 1 PriorityLoopthrough 1Input 2 ProgramLoopthrough 2Input 1 Priority2...24V- Input 10V- Input 2Input 2 Enable2..24V- Enable0V- Mute

    100V

    0

    S lave Input 100V

    +

    +

    -

    -

    100V0

    70V0

    8ohm

    100V/70VSelection (12A)

    Priority Only0

    0No Priority

    Priority

    F7

    01

    F7

    02

    Battery

    Power

    Detection

    Pilot-toneDetector

    230V~ 240V~

    Design & QualityThe Netherlands

    LBB 1938/10

    NL-4827HG-10

    Plena 480W Power AmplifierMax. output power 720WRated output power 180W230V~,50/60HzS/N.

    8900 193 81001

    A035413

    Mad

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    Chin

    a

    N663

    Rated inputPower : 1600VA

    Input 1P riority S lave Input100V

    Input 2E na ble

    100V 0

    100V70V

    00 8

    D ire ct O utput

    Input

    Input

    Input 2-P rogra m

    Input 1-P r iority

    2. . 24VD e fa ult O ff

    G ND 2. . 24VD e fa ult O n

    G ND

    100V 01 00V 0

    Priority Controlled Output

    Off On

    24V DCIn

    Apparatus deliveredconnectored for 230V~

    Main Power

    BatteryInput

    Fault Relays' Output

    NO COM NC

    Off On

    NO COM NC NO COM NC

    Input 1 PriorityLoopthrough 1Input 2 ProgramLoopthrough 2Input 1 Priority2...24V- Input 10V- Input 2Input 2 Enable2..24V- Enable0V- Mute

    100V

    0

    S lave Input 100V

    +

    +

    -

    -

    100V0

    70V0

    8ohm

    100V/70VSelection (12A)

    Priority Only0

    0No Priority

    Priority

    F7

    01

    F7

    02

    Battery

    Power

    Detection

    Pilot-toneDetector

    230V~ 240V~

    Design & QualityThe Netherlands

    LBB 1938/10

    NL-4827HG-10

    Plena 480W Power AmplifierMax. output power 720WRated output power 180W230V~,50/60HzS/N.

    8900 193 81001

    A035413

    Mad

    ein

    Chin

    a

    N663

    Rated inputPower : 1600VA

    Input 1P riority S lave Input100V

    Input 2E na ble

    100V 0

    100V70V

    00 8

    D ire ct O utput

    Input

    Input

    Input 2-P rogra m

    Input 1-P r iority

    2. . 24VD e fa ult O ff

    G ND 2. . 24VD efa ult O n

    G ND

    LBB1925/10

    115V- 230V-

    In

    +24V- +24V-R ated inputP ower : 50VAT 1.0AL 250V

    Apparatus deliveredconnected for 230V-

    T his apparatus must be earthed

    Warning

    MasterOut

    1-4 35

    T rigger 1

    T el/E MG

    0

    Out

    C all In

    C all Active

    Zone 6

    Zone 5

    Zone 1

    C DL

    R

    T rigger 2

    P C AudioIn

    1.Audio+2.0V3.Audio-4.24Vd.c.

    5.Allcall6.Data-7.Data+8.C hs .G ND

    L B B 1925/008 9 0 0 1 9 2 5 0 0 0 5115/230V ~,50/60HzNo.

    R S 232

    /Line

    /Line

    Aux

    3

    54

    1

    2

    37 6

    8

    54

    1

    2

    21

    +-

    G ND

    3 12+

    -G ND

    3

    Zone 2Zone 3

    Zone 4DC Out DC In100V

    100V 0

    0100V 0

    100V 0

    100V

    100V 0

    0

    100V

    100V 0

    0

    4 6 4 6

  • Bosch Security Systems | 2006-11 | 9922 141 50751en

    Plena Power Amplifier | Installation and User Instructions | Amplifiers en | 14

    3.5.3 Connecting the priority input and using the control terminals

    The power amplifier is provided with a balanced priority input (Input 1-Priority) to connect to another pre-amplifier or mixer.Apply a control voltage of 2...24 V to the input 1 priority control terminals (20) to switch ON the priority input (1) and mute the program input (4). A local music source can be connected to the program input and a remote emergency system to the priority input. The emergency source must be able to supply the 2…24 V control voltage to override the local music source. The program input can be remotely controlled by using a switch that is connected to the input 2 enable control terminals (19).

    Application example for use of the power amplifier control terminals (see figure 3.8)You can use up to 6 power amplifiers in combination with the Plena LBB1925/10 System Pre-amplifier to build a powerful multi-zone sound system. Zone switching of BGM and calls is done via the LBB1925/10 zone relays in combination with the power amplifier control terminals. The LBB1925/10 controls the background music by distributing 24 Vdc via the music zone relays to the input 2 enable control terminals (19). The LBB1925/10 controls the calls by distributing 24 Vdc via the call zone relays to the input 1 priority control terminals (20). Each power amplifier serves one loudspeaker zone. Each zone can be OFF, or receive music or a call.

    figure 3.8: Priority input and control terminals

    Priority Only No Priority

    100V 0 1 00V 0Priority Controlled Output

    Off On

    24V DCIn

    Apparatus deliveredconnectored for 230V~

    Main PowerBatteryInput

    Fault Relays' Output

    NO COM NC Off OnNO COM NC NO COM NC

    Input 1 Priority

    Loopthrough 1

    Input 2 Program

    Loopthrough 2

    Input 1 Priority2...24V- Input 10V- Input 2

    Input 2 Enable2..24V- Enable0V- Mute

    100V

    0S lave Input 100V

    +

    +

    -

    -

    100V0

    70V

    0

    8ohm

    100V/70VS election (12A)

    Priority Only0

    0No Priority

    Priority

    F701

    F702

    BatteryPower

    DetectionPilot-toneDetector

    230V~ 240V~

    Design & QualityThe Netherlands

    LBB 1938/10

    NL-4827HG-10

    Plena 480W Power AmplifierMax. output power 720WRated output power 180W230V~,50/60HzS/N.

    8900 193 81001

    A035413

    Mad

    ein

    Chi

    na

    N663

    Rated inputPower : 1600VA

    Input 1P riority

    S lave Input100V

    Input 2E na ble

    100V 0 100V 70V0 0 8

    D ire ct O utput

    InputInput

    Input 2-P rogra mInput 1-P r iority

    2. . 24VD e fa ult O ff

    G ND 2. . 24VD e fa ult O n

    G ND

    Priority Only No Priority

    100V 0 1 00V 0Priority Controlled Output

    Off On

    24V DCIn

    Apparatus deliveredconnectored for 230V~

    Main PowerBatteryInput

    Fault Relays' Output

    NO COM NC Off OnNO COM NC NO COM NC

    Input 1 Priority

    Loopthrough 1

    Input 2 Program

    Loopthrough 2

    Input 1 Priority2...24V- Input 10V- Input 2

    Input 2 Enable2..24V- Enable0V- Mute

    100V

    0S lave Input 100V

    +

    +

    -

    -

    100V0

    70V

    0

    8ohm

    100V/70VS election (12A)

    Priority Only0

    0No Priority

    Priority

    F701

    F702

    BatteryPower

    DetectionPilot-toneDetector

    230V~ 240V~

    Design & QualityThe Netherlands

    LBB 1938/10

    NL-4827HG-10

    Plena 480W Power AmplifierMax. output power 720WRated output power 180W230V~,50/60HzS/N.

    8900 193 81001

    A035413

    Mad

    ein

    Chi

    na

    N663

    Rated inputPower : 1600VA

    Input 1P riority

    S lave Input100V

    Input 2E na ble

    100V 0 100V 70V0 0 8

    D ire ct O utput

    InputInput

    Input 2-P rogra mInput 1-P r iority

    2. . 24VD e fa ult O ff

    G ND 2. . 24VD e fa ult O n

    G ND

    3

    Tel/EMG

    0

    L

    R

    1-4 5

    /Line

    /Line

    Trigger 1 Trigger 2

    PCAudoln

    1. Audio+2.0V3.Audio-4.24Vd.c.

    5. Allcall6.Data-7.Data+8.Chs.GND

    RS232 CD Aux

    MasterOut Out

    100V 0100V 0 100V 0 100V 0

    100V

    115V 230V

    Rated InputPower : 50VAT0.5L 250V

    Apparatus deliveredconnected for 230V-

    0 100V 0 100V 0 100V 0

    +24V- +24V-

    This apparatus must be earthedWarning

    3

    78

    6

    1

    52

    4

    3 1

    52

    4

    LBB1925/10890019251005115/230V~,50/60HzNo.

    3

    1+

    - 2GND

    3

    2+

    - 1GND

    LBB1925/10

    1 4

    20 19 20 19Zone 1 output Zone 2 output

    to next zones

    1 4

  • Bosch Security Systems | 2006-11 | 9922 141 50751en

    Plena Power Amplifier | Installation and User Instructions | Amplifiers en | 15

    3.5.4 100 V slave inputThe power amplifiers have a 100 V slave input (18) that can be connected to an existing 100 V loudspeaker line. In this way it is easy to connect an additional power amplifier on a remote location for more output power.The 100 V input is not affected by the control terminals for input 1 priority (20) or input 2 enable (19).

    NoteIf the 100 V slave input is used, and the 0 V and 100 V are incorrectly connected, no pilot tone is detected on the power amplifier. Refer to section 4.1 for information.

    figure 3.9: 100 V slave input

    Priority Only No Priority

    100V 0 100V 0Priority Controlled Output

    Off On

    24V DCIn

    Apparatus deliveredconnectored for 230V~

    Main PowerBatteryInput

    Fault Relays' Output

    NO COM NC Off OnNO COM NC NO COM NC

    Input 1 Priority

    Loopthrough 1

    Input 2 Program

    Loopthrough 2

    Input 1 Priority2...24V- Input 10V- Input 2

    Input 2 Enable2..24V- Enable0V- Mute

    100V

    0S lave Input 100V

    +

    +

    -

    -

    100V0

    70V

    0

    8ohm

    100V/70VS election (12A)

    Priority Only0

    0No Priority

    Priority

    F701

    F702

    BatteryPower

    DetectionPilot-toneDetector

    230V~ 240V~

    Design & QualityThe Netherlands

    LBB 1938/10

    NL-4827HG-10

    Plena 480W Power AmplifierMax. output power 720WRated output power 180W230V~,50/60HzS/N.

    8900 193 81001

    A035413

    Mad

    ein

    Chi

    na

    N663

    Rated inputPower : 1600VA

    Input 1P riority

    S lave Input100V

    Input 2E na ble

    100V 0 100V 70V0 0 8

    D ire ct O utput

    InputInput

    Input 2-P rogra mInput 1-P r iority

    2. . 24VD e fa ult O ff

    G ND 2. . 24VD e fa ult O n

    G ND

    LBB1938

    100V 02. . 24VD e fa ult O ff

    G ND 2. . 24VD e fa ult O n

    G ND

    171819

  • Bosch Security Systems | 2006-11 | 9922 141 50751en

    Plena Power Amplifier | Installation and User Instructions | Amplifiers en | 16

    3.5.5 Constant voltage loudspeakersThe power amplifier can drive 100 V constant voltage loudspeakers at full power (100 V) or half power (70 V). Connect the loudspeakers in parallel and check the loudspeaker polarity for in-phase connection. The summed loudspeaker power should not exceed the rated amplifier power.

    3.5.6 Low impedance loudspeakersConnect low impedance loudspeakers to the 8 Ohm/0 terminals. This output can deliver the rated output power into an 8 Ohm load. Connect multiple loudspeakers in a series/parallel-arrangement to make the combined impedance 8 Ohm or higher. Check the loudspeaker polarity for in-phase connection.

    3.5.7 PowerUse the mains lead to connect the amplifier to the power supply.

    figure 3.10: Priority input and control terminals

    100V 01 00V 0

    Priority Controlled Output

    Off On

    24V DCIn

    Apparatus deliveredconnectored for 230V~

    Main Power

    BatteryInput

    Fault Relays' Output

    NO COM NC

    Off On

    NO COM NC NO COM NC

    Input 1 PriorityLoopthrough 1Input 2 ProgramLoopthrough 2Input 1 Priority2...24V- Input 10V- Input 2Input 2 Enable2..24V- Enable0V- Mute

    100V

    0

    S lave Input 100V

    +

    +

    -

    -

    100V0

    70V0

    8ohm

    100V/70VSelection (12A)

    Priority Only0

    0No Priority

    Priority

    F7

    01

    F7

    02

    Battery

    Power

    Detection

    Pilot-toneDetector

    230V~ 240V~

    Design & QualityThe Netherlands

    LBB 1938/10

    NL-4827HG-10

    Plena 480W Power AmplifierMax. output power 720WRated output power 180W230V~,50/60HzS/N.

    8900 193 81001

    A035413

    Mad

    ein

    Chin

    a

    N663

    Rated inputPower : 1600VA

    Input 1P riority S lave Input100V

    Input 2E na ble

    100V 0

    100V70V

    00 8

    D ire ct O utput

    Input

    Input

    Input 2-P rogra m

    Input 1-P r iority

    2. . 24VD e fa ult O ff

    G ND 2. . 24VD e fa ult O n

    G ND

    Priority Only No Priority

    100V 0 100V 0Priority Controlled Output 24V DCIn

    100V 70V0 0 8

    D ire ct O utput

    Priority Only No Priority

    70 V100 V

    8 Ohm

    8 Ohm

    8 Ohm

    8 Ohm

    8 Ohm

    8 Ohm

    4 Ohm

    4 Ohm

    LBB1938

    figure 3.11: Mains lead

    100V 0100V 0

    Priority Controlled Output 24V DCIn

    Apparatus deliveredconnectored for 230V~

    Main Power

    Batteryt

    elays' Output

    NC

    Off On

    NO COM NC NO COM NC

    100V0

    70V0

    8ohm

    100V/70VSelection (12A)

    Priority Only0

    0No Priority

    Priority

    F7

    01

    F7

    02

    Battery

    Power

    Detection230V~ 240V~

    Rated inputPower : 1600VA

    100V70V

    00 8

    D ire ct O utput

    100V 01 00V 0

    Priority Controlled Output

    Off On

    24V DCIn

    Apparatus deliveredconnectored for 230V~

    Main Power

    BatteryInput

    Fault Relays' Output

    NO COM NC

    Off On

    NO COM NC NO COM NC

    Input 1 PriorityLoopthrough 1Input 2 ProgramLoopthrough 2Input 1 Priority2...24V- Input 10V- Input 2Input 2 Enable2..24V- Enable0V- Mute

    100V

    0

    S lave Input 100V

    +

    +

    -

    -

    100V0

    70V0

    8ohm

    100V/70VSelection (12A)

    Priority Only0

    0No Priority

    Priority

    F7

    01

    F7

    02

    Battery

    Power

    Detection

    Pilot-toneDetector

    230V~ 240V~

    Design & QualityThe Netherlands

    LBB 1938/10

    NL-4827HG-10

    Plena 480W Power AmplifierMax. output power 720WRated output power 180W230V~,50/60HzS/N.

    8900 193 81001

    A035413

    Mad

    ein

    Chin

    a

    N663

    Rated inputPower : 1600VA

    Input 1P riority S lave Input100V

    Input 2E na ble

    100V 0

    100V70V

    00 8

    D ire ct O utput

    Input

    Input

    Input 2-P rogra m

    Input 1-P r iority

    2. . 24VD e fa ult O ff

    G ND 2. . 24VD e fa ult O n

    G ND

    Line fuseT10L250V

  • Bosch Security Systems | 2006-11 | 9922 141 50751en

    Plena Power Amplifier | Installation and User Instructions | Supervision en | 17

    4 Supervision

    Supervision is provided for:• Pre-amplifier and power amplifier function• Battery and mains supervisionRelays are provided on the rear panel for the each supervised function and are normally energized (fail safe). Each relay has 3 contacts, normally open, common and normally closed.If an application does not need supervision, the indicators on the front panel can be set to OFF with the switches next to each relay output. The relays always function and are independent of the indicator switch setting.

    4.1 Input pilot toneThe pilot tone of 20 kHz at -20 dBV supervises the pre-amplifier, the connections between the pre-amplifier and the power amplifier and function of the power amplifier. If the input signal from the pre-amplifier stops, the mains and battery fail or the power amplifier stops for any other reason, the pilot tone stops, the Pilot- Tone fault indication shows on the front panel and a signal is given on the Input fault relay.If the power amplifier stops through overheat, then the Overheat indicator shows on the front panel, the signal is given on the Input fault relay.The Pilot-Tone detection indicator can be set to ON or OFF with the Pilot-Tone detection switch (17). The Pilot-Tone indicator on the front panel is set to OFF, but the fault relay switch still functions.

    4.2 Battery supervisionThe power amplifier supervises the availability of the back-up power supply.If the battery supply fails the Battery fault indication shows on the front panel and a signal is given on the Battery fault relay.The Battery Supervision indicator can be set to ON or OFF with the Battery detection switch (15). The Battery indicator on the front panel is set to OFF, but the fault relay switch still functions.

    4.3 Mains supervisionThe power amplifier supervises the availability of the mains supply. If the mains supply fails and the back-up power supply starts, a signal is needed to indicate the mains failure. The Mains fault indication shows on the front panel and a signal is given on the Mains fault relay.

  • Bosch Security Systems | 2006-11 | 9922 141 50751en

    Plena Power Amplifier | Installation and User Instructions | Supervision en | 18

    Intentionally left blank.

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    Plena Power Amplifier | Installation and User Instructions | Operation en | 19

    5 Operation

    5.1 ON and OFF

    5.1.1 Switch onPut the power switch on the rear of the power amplifier (see figure 5.1) in the I position.If mains power or back-up power is available, the VU-bar (1) on the front of the power amplifier is lit and shows the output level of the amplifier (see figure 5.2).If the internal temperature reaches a critical limit due to poor ventilation or overload, an overheat protection circuit switches OFF the power stage. The Overheat indicator (5) shows on the front panel and a signal is given on the Input fault relay if the power stage is switched OFF by the overheat protection circuit.The Battery operation indicator (3) lights up if the mains power supply is failing and the back-up battery is in use.

    5.1.2 Switch offPut the power switch of the power amplifier (see figure 5.1) in the O position.

    figure 5.1: Power switch

    100V 0100V 0

    Priority Controlled Output 24V DCIn

    Apparatus deliveredconnectored for 230V~

    Main Power

    Batteryt

    elays' Output

    NC

    Off On

    NO COM NC NO COM NC

    100V0

    70V0

    8ohm

    100V/70VSelection (12A)

    Priority Only0

    0No Priority

    Priority

    F7

    01

    F7

    02

    Battery

    Power

    Detection230V~ 240V~

    Rated inputPower : 1600VA

    100V70V

    00 8

    D ire ct O utput

    100V 01 00V 0

    Priority Controlled Output

    Off On

    24V DCIn

    Apparatus deliveredconnectored for 230V~

    Main Power

    BatteryInput

    Fault Relays' Output

    NO COM NC

    Off On

    NO COM NC NO COM NC

    Input 1 PriorityLoopthrough 1Input 2 ProgramLoopthrough 2Input 1 Priority2...24V- Input 10V- Input 2Input 2 Enable2..24V- Enable0V- Mute

    100V

    0

    S lave Input 100V

    +

    +

    -

    -

    100V0

    70V0

    8ohm

    100V/70VSelection (12A)

    Priority Only0

    0No Priority

    Priority

    F7

    01

    F7

    02

    Battery

    Power

    Detection

    Pilot-toneDetector

    230V~ 240V~

    Design & QualityThe Netherlands

    LBB 1938/10

    NL-4827HG-10

    Plena 480W Power AmplifierMax. output power 720WRated output power 180W230V~,50/60HzS/N.

    8900 193 81001

    A035413

    Mad

    ein

    Chin

    a

    N663

    Rated inputPower : 1600VA

    Input 1P riority S lave Input100V

    Input 2E na ble

    100V 0

    100V70V

    00 8

    D ire ct O utput

    Input

    Input

    Input 2-P rogra m

    Input 1-P r iority

    2. . 24VD e fa ult O ff

    G ND 2. . 24VD e fa ult O n

    G ND

    Line fuseT10L250V

    figure 5.2: Front panel LBB1938/20

    0 dB

    -6 dB

    -20 dB

    Battery OverheatMainsPilot-Tone

    Status

    Plena Booster Amplifier

    1

    3 4 52 6

  • Bosch Security Systems | 2006-11 | 9922 141 50751en

    Plena Power Amplifier | Installation and User Instructions | Operation en | 20

    5.2 Technical data

    5.2.1 Electrical

    5.2.2 Performance

    5.2.3 Inputs

    5.2.4 Loudspeaker outputs

    5.2.5 Environmental conditions

    5.2.6 General

    Mains voltage:230/115 V(AC), ± 10%, 50/60 HzRated power:LBB 1930/20 400 VALBB 1935/20 960 VALBB 1938/20 1600 VALBB 1939/20 3600 VABattery voltage:20.0 to 26.5 V(DC)

    Frequency response:50 Hz - 20 kHz (+1/-3 dB @ -10 dB ref. rated outputDistortion: 80 dBLBB 1935/20 > 85 dBLBB 1938/20 > 90 dBPLN-1P1000 > 90 dBSignal-to-noise ratio (flat at max. volume):> 85 dB

    Line input, 3 pin XLR, balanced:Sensitivity 1 VImpedance 20 kOhmCMRR > 40 dB (50 Hz - 20 kHz)100 V input, screw unbalanced:Sensitivity 100 VImpedance 330 kOhm

    Line loopthrough output (3 pin XLR balanced):Nominal level 1 VImpedance direct connection to line inputLoudspeaker outputs:Maximum rated output power70/100 V outputLBB 1930/20 180 W / 240 WLBB 1935/20 360 W / 240 WLBB 1938/20 720 W / 480 WPLN-1P1000 1800 W / 1000 W 8 Ohm output:LBB 1930/20 31 V 120 W LBB 1935/20 44 V 240 WLBB 1938/20 62 V 480 WPLN-1P1000 88 V 1000 WOutput power @ 24 V battery operations:-1 dB reference rated power

    Operating temperature range:-10 to +55 °CStorage temperature range:-40 to +70 °CRelative humidity:< 95%

    EMC emission:According to EN55103-1EMC immunity:According to EN55103-2Acoustic noise level of fan:< 45 dB SPL @ 1 m at maximum speedDimensions:19” wide,2 units: 100 mm high, 250 mm deep 3 Units: 145 mm high, 370 mm deep19” mounting brackets:includedWeight:LBB 1930/20 10.5 kgLBB 1935/20 12.5 kgLBB 1938/20 25.0 kgPLN-1P1000 27.0 kg

  • Bosch Security Systems | 2006-11 | 9922 141 50751en

    Plena Power Amplifier | Installation and User Instructions | Operation en | 21

    5.2.7 Power Consumption LBB1930 LB1935 LBB1938 PLN-1P1000

    230/115 V

    W

    0 dB (Pmax) 274 451 987 2200- 3 dB 193 340 715 1472- 6 dB 143 244 508 1058- 20 dB (20 khz) 41 55 113 345- ∞ dB (idle) 18 16 25 115

    24 V dB (ref 230/115 V) -2 -1 -2 -1

    A0 dB (Pmax) 7 12 32 48- 3 dB 6 11 26 34- 6 dB 4 8 18 25- 20 dB (20 khz) 1 2 4 8- ∞ dB (idle) 0,1 0,3 1 2

    W0 dB (Pmax) 168 289 761 1152- 3 dB 145 273 617 823- 6 dB 103 194 442 598- 20 dB (20 khz) 23 41 91 182- ∞ dB (idle) 2 6 17 36

  • Bosch Security Systems | 2006-11 | 9922 141 50751en

    Plena Power Amplifier | Installation and User Instructions | Operation en | 22

    figure 5.3: Rear panel LBB1938

    Apparatusdelivered

    connectoredfor 230V~

    Input 1 Priority

    Loopthrough 1

    Input 2 Program

    Loopthrough 2

    Input 1 Priority2...24V- Input 10V- Input 2

    Input 2 Enable2..24V- Enable0V- Mute

    100V

    0Slave Input 100V

    +

    +

    -

    -

    Design & QualityThe Netherlands

    LBB 1938/10

    NL-4827HG-10

    Plena 480W Power AmplifierMax. output power 720WRated output power 180W230V~,50/60HzS/N.

    8900 193 81001

    A035413

    Mad

    ein

    Chi

    na

    N663

    Rated inputPower : 1600VA

    Off On

    Main PowerBatteryInput

    Fault Relays' Output

    NO COM NC Off OnNO COM NC NO COM NC

    BatteryDetection

    Pilot-toneDetector

    InputInput

    Input Output

    Input 2-Progr

    Power

    amInput 1-Priority

    Input 1Priority

    Slave Input100V

    Input 2Enable

    100V 02..24VDefault Off

    GND 2..24VDefault On

    GND

    24V DCIn

    Priority Only No Priority

    100V 100V 0V0V

    Priority Controlled Output

    100V 70V0 0 8Direct Output

    100V070V0

    8ohm

    100V/70VSelection (12A)

    Priority Only0

    0No Priority

    Priority

    F701

    F702 10

    11

    12

    3 4 52 61

    1617 15181920

    97 8

    14

    figure 5.4: Rear panel PLN-1P1000

    A035413

    N663

    20 19 18 16

    1214

    11

    1

    3

    4

    6

    1091517 8

    20 19 7

    FunctionsCertifications and ApprovalsParts IncludedTechnical SpecificationsPLN-1P1000_Manual.pdfImportant SafeguardsTable of contents1 Introduction1.1 Purpose1.2 Digital document1.3 Intended audience1.4 Related documentation1.5 Alerts1.6 Signs1.7 Conversion tables

    2 System Overview2.1 Plena

    3 Amplifiers3.1 Introduction3.2 Controls, connectors and indicators3.2.1 Front panel connectors and indicators3.2.2 Rear panel connectors and indicators

    3.3 Internal setting3.4 Installation3.5 External connections3.5.1 Connect the back-up power supply3.5.2 Connecting line input and loopthrough3.5.3 Connecting the priority input and using the control terminals3.5.4 100 V slave input3.5.5 Constant voltage loudspeakers3.5.6 Low impedance loudspeakers3.5.7 Power

    4 Supervision4.1 Input pilot tone4.2 Battery supervision4.3 Mains supervision

    5 Operation5.1 ON and OFF5.1.1 Switch on5.1.2 Switch off

    5.2 Technical data5.2.1 Electrical5.2.2 Performance5.2.3 Inputs5.2.4 Loudspeaker outputs5.2.5 Environmental conditions5.2.6 General5.2.7 Power Consumption