Baldwin Boxall Communications Ltd.
Wealden Industrial Estate, Farningham Road
Crowborough, East Sussex, TN6 2JR
Telephone: 01892 664422 Fax: 01892 663146
Website: www.baldwinboxall.co.uk
Email: mail@baldwinboxall.co.uk
IBEL2
Issue 2 12/01/1999
BEL2
Operating Instructions
- 2 - Issue 2
BEL2 Loudspeaker Line Protection Unit
When using the BEL2 set to 7.5W the amplifier must be at least 60W and 150W when set to 15W in
order to operate the short circuit isolator facility. The BEL2 will only operate on the 100V
loudspeaker line system in conjunction with the IMP18 and BEL1. Using a 4 core cable to the
loudspeaker the BEL2 monitors the connection to the transformer primary for open and short circuits.
An LED mounted on the lid indicates a fault when illuminated.
In addition if this speaker feed should develop short circuit condition, it will isolate it from the main
speaker line preventing total loss from other speakers on the line.
Max insertion loss: 7.5W load - 0.8dB 15W load - 0.8dB
The BEL2 requires loudspeakers to be cabled in a four core cable - 2 cores for 100V line wiring in and
two cores for 100V line wiring out as per the drawing above. Please note J3 is removed for
loudspeakers tapped at 15W and 7.5W as the input voltage exceeds 100V and handling is dangerous -
Please be careful!
E
IN
OUT J1
J2
J3
MONITORED AND
PROTECTED SPUR
4 CORE CABLE
REMOVE J3 IF THE INPUT VOLTAGE EXCEEDS
THE OUTPUT VOLTAGE, SEE FOLLOWING EXAMPLE.
WHEN DESPATCHED FROM THE FACTORY, THE BEL2
IS SET FOR SPEAKER LOADS BETWEEN 7.5 & 15W.
REMOVE J1 & J2 FOR SPEAKER LOADS UP TO 7.5W.
ZONE SPEAKER FIRE RESISTANT CABLE IN/OUT
ZONE SPEAKER FIRE RESISTANT CABLE IN/OUT
CUTAWAY VIEW SHOWING HOW CABLES
SHOULD BE TERMINATED IN THE 100V LINE
FEED CONNECTOR TO ALLOW BOTH
SCREWS TO CLAMP CONDUCTOR.
MAX 2.5mm CROSS SECTIONAL AREA.
WHEN REPLACING THE LID, LOCATE
LED IN THE BEZEL FIRST.
OUT IN
BEL2
TAP
COM
- 3 - Issue 2
R
Y
G
B
IN
OUT
G
B
R
Y
R
Y
G
B
IN
OUT
B
Y
R
G
R
Y
G
B
IN
OUT
R
Y
G
B
IN
OUT
R
Y
G
B
G
Y
R
B
J1 & J2 fitted, J3 removed as input voltage
is approximately 160V.
NOTE: Damage could occur if J3 is not removed.
PAC15T Tapped at 15W, BEL2 set to 15W.
NOTE: Damage could occur if J3 is not removed.
PAC15T Tapped at 7.5W, BEL2 set to 7.5W.
J1, J2 and J3 removed as input voltage is
approximately 270V.
PAC15T Tapped at 4W, BEL2 set to 7.5W.
J1 & J2 removed, J3 fitted as input voltage
is approximately 66V.
PAC15T Tapped at 0.8W, BEL2 set to 7.5W.
J1 & J2 removed, J3 fitted as input voltage
is approximately 32V.
Fig 2 - Various connection notes when using the BEL2 with Next2 PAC15T speakers
BEL2 connector
PAC15T
BEL2 connector
PAC15T
BEL2 connector
PAC15T
BEL2 connector
PAC15T
- 4 - Issue 2
100
50
0
output
100V
Amplifier
VIGIL or
ADEPT
100
50
0
output
100V
Amplifier
VIGIL or
ADEPT
Line A
Line B
A
B
Access etc
0V ground
Signal input
To other IMP18 Modules
Connect to 0V
for continuous
surveilance
when setting
up the system
Connections when IMP18
is installed in VIGIL BVMX
5 pin connections when
IMP18 is installedin ADEPT
3
1
5
4Line A
Line B
+ 20V
0V
Lamp Test
9 way D Connector
Relay shown in fault condition
eg. fire control panel
Remote Fault Indication
External
Lamp
Test
1
2
3
4
5
6
7
8
9
line
line
BEL1
line
line
BEL1
BEL2
FIRE RESISTANT
CABLE
FIRE RESISTANT
CABLE
BEL2
4 CORE CABLE4 CORE CABLE
BEL2BEL2
4 CORE CABLE4 CORE CABLE
Fig 3 - Typical Voice Evacuation System using the BEL1, BEL2 and IMP18
/
