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Bosch LBB 1930 Installation And Operating Manual

Plena booster amplifier.
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Plena Booster Amplifier
Installation and Operating Manual
LBB 1930, LBB 1935,
en
LBB 1938

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   Summary of Contents for Bosch LBB 1930

  • Page 1

    Plena Booster Amplifier Installation and Operating Manual LBB 1930, LBB 1935, LBB 1938...

  • Page 3: Important Safeguards

    This is a safety feature. If you are unable to insert the plug into the outlet, contact your electrician to replace your obsolete outlet. Do not defeat the safety purpose of the grounding-type lug. Bosch Security Systems | 2003-09 | 3922 988 92983en...

  • Page 4: About This Manual

    Do not open the unit when it is connected to the mains. The unit contains non-insulated parts, which can cause electric shock. Caution There are no user-serviceable parts inside the unit. Service must be done by qualified personnel. Bosch Security Systems | 2003-09 | 3922 988 92983en...

  • Page 5: Table Of Contents

    4.5.2 Low impedance loudspeakers ..........................17 Mains connection ..............................17 5 Operation of booster amplifier ............................18 6 Technical data ..................................19 Electrical ..................................19 Performance ................................19 Inputs ..................................19 Outputs ..................................20 Environmental conditions ............................20 General ..................................20 Bosch Security Systems | 2003-09 | 3922 988 92983en...

  • Page 6

    Plena Booster Amplifier | Installation and Operating Manual | Table of Contents en | 6 Bosch Security Systems | 2003-09 | 3922 988 92983en...

  • Page 7: About The Equipment

    Input 2 Enable 2..24V - Enable 0V - Mute 100V Slave Input 100V Power Inrush current 230V DC Fuse 40A Fuse 10A limiter Power Delay Battery DC In 24V Figure 1.2 Bosch Security Systems | 2003-09 | 3922 988 92983en...

  • Page 8: Controls And Indicators (front)

    2 VU-meter (LED's for -20, -6, 0 dB and Power ON) 3 Battery operation indicator (only for LBB1938) 4 Overheat indicator (only for LBB1938) 5 Air inlet for forced air cooling (only for LBB1938) Bosch Security Systems | 2003-09 | 3922 988 92983en...

  • Page 9: Controls And Connections (lbb1930, Lbb1935 - Rear)

    13 100 V slave input terminals 6 Line loopthrough 2 (XLR/balanced) 14 Input 2 enable control terminals 7 Priority controlled loudspeaker output terminals 15 Input 1 priority control terminals 8 Earth connection screw Bosch Security Systems | 2003-09 | 3922 988 92983en...

  • Page 10: Internal Setting (lbb1938 Only)

    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. Caution Never insert two fuses into F701 and F702 simultaneously. Bosch Security Systems | 2003-09 | 3922 988 92983en...

  • Page 11: Installation In Rack

    If the internal temperature reaches a critical limit due to insufficient air flow, overload or an excessive ambient temperature, the overheat protection will be activated, causing the amplifier to switch to standby mode. Bosch Security Systems | 2003-09 | 3922 988 92983en...

  • Page 12: External Settings And Connections

    You can earth (8) the unit to increase the electrical stability of the system. Caution The connection cable must have an in-line fuse. Use the type of fuse as mentioned in the illustration. Bosch Security Systems | 2003-09 | 3922 988 92983en...

  • Page 13: Connecting The Line Input And Loopthrough

    For the LBB1938 use program line - input 2 (4) and line loopthrough 2 (6) for normal operation without priority. Volume control Use the volume control next to the line input to set the output level of the booster amplifier. Bosch Security Systems | 2003-09 | 3922 988 92983en...

  • Page 14: Connecting The Priority Input And Using The Control Terminals (lbb1938 Only)

    LBB1925/10 controls the calls by distributing 24 Vdc via the call zone relays to the LBB1938 input 1 priority control terminals (15). Each booster serves one loudspeaker zone. Each zone can be OFF, or receive music or a call. Bosch Security Systems | 2003-09 | 3922 988 92983en...

  • Page 15: 100 V Slave Input

    The 100 V input of the LBB1938 (13) is not affected by the control terminals for input 1 priority (15) or input 2 enable (14). Bosch Security Systems | 2003-09 | 3922 988 92983en...

  • Page 16: Connecting Loudspeakers

    The booster 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. Bosch Security Systems | 2003-09 | 3922 988 92983en...

  • Page 17: Low Impedance Loudspeakers

    Use the supplied mains cord to connect the system to the mains supply. Note (LBB 1930 and LBB 1935 only) If necessary set the mains voltage switch 230/240 V (11) to the required voltage using a sharp object, e.g. a small screwdriver. Bosch Security Systems | 2003-09 | 3922 988 92983en...

  • Page 18: Operation Of Booster Amplifier

    The overheat indicator (4) lights up 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. Bosch Security Systems | 2003-09 | 3922 988 92983en...

  • Page 19: Technical Data

    Line input 1, 2 (3-pin XLR, balanced) - LBB1938/00 Sensitivity Impedance 20 kOhm CMRR > 25 dB (50 Hz - 20 kHz) 100 V input (Screw, unbalanced) Sensitivity 100 V Impedance 330 kOhm Bosch Security Systems | 2003-09 | 3922 988 92983en...

  • Page 20: Outputs

    100 x 430 x 270 mm (19” wide, 2U high, with feet) LBB1938/00 145 x 430 x 370 mm (19” wide, 3U high, with feet) Weight LBB1930/x0 approx. 10.5 kg LBB1935/x0 approx. 12.5 kg LBB1938/00 approx. 25 kg 19” mounting brackets included Bosch Security Systems | 2003-09 | 3922 988 92983en...

  • Page 22

    For more information visit www.boschsecuritysystems.com © Bosch Security Systems B.V. Data subject to change without notice 2003-09 | 3922 988 92983en...

This manual also for:

Lbb 1935, Lbb 1938

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