Vingtor Stentofon VPA-120, Инструкция по установке и обслуживанию

Страница: 5 / 22

A100K10876 Installation and Service Manual Page 5
VPA Amplifiers
The amplifier must be grounded either through the earth leg in the
mains plug or by a 1.5 mm wire between the amplifier’s ground terminal
and proven good grounding point, e.g. the rack frame.
2.4 Signal inputs
There are two inputs with 3-pin XLR connectors.
z
Entertainment (BGM) for background music etc. with separate
preset input level control.
z
Call / alarm input for announcements and alarm messages with
separate preset input level control.
Both inputs are connected in parallel with signal outputs to slave
amplifiers or recorders.
There are common master tone- and volume controls for both inputs. In
addition, the volume may be controlled remotely by an external
potentiometer.
A call input signal will automatically mute the BGM entertainment source
(VOX function). This can also be achieved manually by connecting the
microphone switch to the priority terminals.
A pre-warning chime signal can be given in front of a message when a
priority switch is pushed. This feature can be switched on/off and the
chime loudness can be adjusted.
2.5 Loudspeaker outputs
There are three loudspeaker outputs:
z
Call and Background Music (BMG) , full power output available on
an 8 Ohm terminal as well as on a 100 V constant voltage line.
z
Call only , full power output on a 100 V constant voltage line. This
terminal carries no background music.
z
Monitor Loudspeaker , 1 W power output to an 8 Ohm loudspeaker,
normally mounted close to the amplifier to monitor entertainment and
call channels. The output has a separate volume control.
2.6 Optional connections
z
Fault Relay , NO/NC contacts of a built-in relay is available for
remote warning devices. The relay is activated during fault conditions
such as mains power failure or open or shorted speaker lines.
z
DC Out, 24 VDC/800 mA is available for optional equipment.
z
Remote, connection of remote master volume control. A logaritmic
22 kOhm potmeter is suitable.
z
Priority, by pushing a button on the microphone, a chime signal is
manually activated in front of a message.
2.7 Indicators
z
Power on , red LED is lit when the amplifier is powered from mains
or battery.
z
VU-meter , row of five LEDs indicating the signal pressure from -18
dB to +1 dB.
z
Fault , a red warning LED will be lit if the master volume is set to less
than 40%, or if the loudspeaker line is shorted.
A fault relay will be activated during fault conditions; the switch-over
contacts are available on the rear for remote warning devices.
z
Overload , a red warning LED will be lit if the input signal is too high,
or if the loudspeaker impedance is too low (too many loudspeakers
in parallel) or shorted loudspeaker line.
OUT
OUT
CALL
BGM
– 6 + 6
– 6 + 6
0
0
IN
IN
0 0
MASTER BASS TREBLE
0
– + – +
CHIME
CHIME
ON OFF
0
CALL / BMG CALL ONLY
C
O
M
8
Ω
10
0V
C
O
M
10
0V
MON ITOR
C
O
M
8
Ω MON ITOR
MONITOR FAULT RELAY DC OUT REMOTE PRIORITY
C
O
M
800 mA
8
Ω
NC NO - C
O
M
24V +
POWER FAULT OVERLOAD
-18 -10 -6 0 +1dB
Warning
This appatatus must be earthed
PRIORITY