Procom 4LSL User Manual
Data Sheet
g
4LSL
Loudspeaker Function Card
4LSL
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)
• Minimum load and overload monitoring
(2.5 W>=load<= 150 W)
• Distribution of loudspeaker circuits through independent
• Generation of positive or negative public address ac-
Loudspeaker Impedance Monitoring
Fig. 4LSL (L- No. 2.830)
and allocation of the loudspeaker circuit
power relays
knowled
ements
Date:
13.03.2009
Page:
1/7
© 2008 ProCom, All rights and technical changes reserved
Author: HS Document-No.:
DB_4LSL_2830_01
Data Sheet
A
V
V
V
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. The functionality of the signal generator is also tested before each
measurement cycle by the 4LSL.
Brief Description:
The 4LSL is part of an application for monitoring impedance in loudspeaker circuits and distributed loudspeaker circuits. It switches the sine wave generated by the
test signal generator to the loudspeaker circuit and compares the flow of current and
the voltage with previously made reference values.
DTA-012 -030/ -048/ -066/ -084/ -114
* TW = Twin Wire
WPS-04
WPS-08
2TW *
DSS1
CPU1
SV01 4NS
DVS-21
TG01
4LSL
100
100
100
Havarie
LC2 ..
LC 1
LC 2
LC n
Monitoring of loudspeakers according to the
equipment level 1 of the Deutschen Bahn AG
LC 1
LC 2
LC n
Application example of loudspeaker circuit monitoring
Date:
13.03.2009
Page:
2/7
Author: HS Document-No.:
© 2008 ProCom, All rights and technical changes reserved
DB_4LSL_2830_01
Data Sheet
Amp
4LSL
Loudspeaker Function Card
The principle functions are illustrated in the following block diagram.
4LSL
Measuring Circuit
Messkreis
Kopplung
MUX
2 x 4-
2
x 4- Kanal
Chanel
U
I
Coupling
Mess-
Msgmt.
lifier
verstärker
U
I
Mess-
Msgmt.
Evaluator
auswerter
(Z)
S
t
C
e
O
u
N
T
e
R
r
O
u
L
n
P
C
M
Satz 1
Set 1
V 1
(V100)
LK 1
Set 4
Satz 4
V 1
(V100)
LK 1
U
I
U
I
U
I
U
I
g
TG01
G
I
n
A
d
n
i
z
c
e
a
i
t
i
g
o
e
n
Block diagram 4LSL
The 4LSL consists essentially of a control unit, a measuring circuit and 4 independent sets. Each set has a low frequency (LF) input (usually from the V100
amplifier) and a loudspeaker output.
Required for the impedance measurement is the measurement signal generated
by the TG01. Locking by the relay ensures that only one action can be carried out
on the set, and that the LF signal does not reach the TG01. The measurement
signal (125 Hz) is given on the loudspeaker circuit. The current flowing there is
added to the measurement circuit through an input transformer and analysed together with the output voltage. All processes are controlled through configurable
programmes in the ICS software.
For a public address system the LF signal is added to the loudspeaker circuit
through an output transformer.
Displays and messages are regulated by the control unit.
Public address and testing in a loudspeaker circuit are blocked off from one an-
other. Public address has higher priority; a test is carried out after a public address.
+5V
GND
-5V
KS
BUS
-48V
+0V
Date:
13.03.2009
Page:
3/7
© 2008 ProCom, All rights and technical changes reserved
Author: HS Document-No.:
DB_4LSL_2830_01
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