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Data Sheet

4LSL

Loudspeaker Function Card

4LSL

Loudspeaker Impedance Monitoring

Fig. 4LSL (L- No. 2.830)

At a Glance:

• Active monitoring of impedance on 4 independent LF

channels (configurable deviation thresholds from 1% to 99%)

• Short circuit and wire break recognition

• Ground connection message (recognition through TG01)

and allocation of the loudspeaker circuit

• Minimum load and overload monitoring

(2.5 W>=load<= 150 W)

• Distribution of loudspeaker circuits through independent

power relays

• Generation of positive or negative public address ac-

knowled

ements

Date:

13.03.2009

Page:

1/7

Author:

Document-No.:

DB_4LSL_2830_01

Summary of content (7 pages)

PAGE 1
Data Sheet 4LSL Loudspeaker Function Card 4LSL Loudspeaker Impedance Monitoring Fig. 4LSL (L- No. 2.830) At a Glance: Date: • Active monitoring of impedance on 4 independent LF channels (configurable deviation thresholds from 1% to 99%) • Short circuit and wire break recognition • Ground connection message (recognition through TG01) and allocation of the loudspeaker circuit • Minimum load and overload monitoring (2.
PAGE 2
Data Sheet 4LSL Loudspeaker Function Card In order to make a public address announcement it is necessary that the loudspeaker circuits to be used are in functioning order. One way to gauge this is to use the impedance which was measured during commissioning. The 4LSL can be used to cyclically check loudspeaker circuits for deviations in impedance. To do this a measurement signal is required which is generated by the TG01 module.
PAGE 3
Data Sheet 4LSL Loudspeaker Function Card The principle functions are illustrated in the following block diagram. 4LSL Measuring Circuit Messkreis +5V Kopplung Coupling MUX 2 x 42 x 4- Kanal Chanel U MessMsgmt. Amplifier verstärker I U MessMsgmt.
PAGE 4
Data Sheet 4LSL Loudspeaker Function Card Function Description: The following functions are available on the 4LSL: Monitoring of Impedance New installations or changes in a loudspeaker circuit are monitored for changes in impedance behaviour with the help of the 4LSL module. For this the installed and manually tested loudspeaker circuit is measured with the 4LSL module and its impedance is determined.
PAGE 5
Data Sheet 4LSL Loudspeaker Function Card Short Circuit and Wire-Break Recognition In loudspeaker circuits wire breaks and short circuits occur that are caused by external effects and which lead to the outage of the loudspeakers. Short circuits or wire breaks are detected and signalled by the 4LSL module during each subsequent measurement of the loudspeaker circuit.
PAGE 6
Data Sheet 4LSL Loudspeaker Function Card Commissioning Functions The 4LSL measuring module includes additional commissioning and servicing aids to better control the measurement equipment or the loudspeaker circuits.
PAGE 7
Data Sheet 4LSL Loudspeaker Function Card The Front Plate Symbols and Their Meaning: The system blinker Addressing from processor taking place I/O Input/output BUS output works as push-push operation with the system blinker BUS input works as push-pull operation with the system blinker M Status Display for Impedance Measurement, and Display of Level (depending on set) impedance measurement active/ inactive/ interrupted On Display of Status for Public Address, and Display of Level (depending on set)