Monacor PA-5240 Manual De Instrucciones página 10

5.5 Additional amplifier
If the number of the required speakers is
higher than the number admissible for the
amplifier, an additional amplifier will be
required . Connect the input of the addi-
tional amplifier to the jack PRE OUT in the
area INSERTS (18) . The signal for the addi-
tional amplifier will not be affected by the
zone attenuators (6) .
5.6 Switches for chime and siren
For remote activation of the chime, con-
nect a momentary pushbutton switch to the
contacts "Remote Chime" (30) . For using
the siren, connect a switch to the contacts
" Remote Siren" (30) . To allow activation from
several places, it is possible to connect several
switches or momentary pushbutton switches
in parallel .
5.7 Switch for remote
activation / deactivation
A separate switch allows remote activation
and deactivation of the amplifier . For this
purpose, connect an on-off switch to the
terminal strip AC POWER REMOTE (26) . For
remote activation or deactivation, the ampli-
fier must not be switched on with the POWER
switch (14) .
5.8 Adjusting the volume attenuation,
the siren and the chime
Automatic volume attenuation:
Use the control "Mute Level" (31) to adjust
the volume attenuation level (see chapter 6 .2)
from −25 dB to −35 dB .
Siren: Use the control "Siren Level" (32) to
adjust the siren volume .
Chime: Use the control „Chime Level" (33)
to adjust the chime volume .
Note: To prevent activation of the chime from the
PTT microphones connected to the inputs 2 – 4 (34),
remove the jumper from the screw terminals "IN-
PUTS Chime On / Off" (30) .
5.8.1 Switching over between 2-tone
chime and 4-tone chime
A jumper in the amplifier allows selection of
2-tone chime or 4-tone chime .
WARNING The chime must be switched
over by skilled personnel only .
For this purpose, the amplifier
must be opened . Always dis-
connect the mains plug from
the socket before opening the
amplifier; otherwise, you will
risk an electric shock!
1) If an emergency power supply unit is con-
nected, disconnect it from the terminals
DC POWER (28) to make sure that the am-
plifier is definitely out of operation .
2) Unscrew the housing cover of the amplifier .
3) Use the jumper MS 1 on the left PC board
at the rear side of the amplifier to make
the adjustment:
position "2T" = 2-tone chime
position "4TONE" = 4-tone chime
4) Screw on the housing cover again .
10
5.9 Power supply and
emergency power supply
1) For continued operation of the amplifier
after a possible power failure, connect a
24 V emergency power supply unit (e . g .
MONACOR PA-24ESP) to the terminals
DC POWER ⎓ 24 V (28) . For a cable length
of up to 4 m, a cable cross section of 5 mm
is required .
Note: If the 24 V voltage from the emergency
power supply unit is present at the terminals
DC POWER ⎓ 24 V, the amplifier cannot be
switched off with the switch POWER (14) . In
case of a mains failure or if it is switched off, it
switches automatically to the emergency power
supply .
2) Connect the mains cable provided to the
mains jack (24) and then to a mains socket
(230 V / 50 Hz) .
Even when it is switched off, the amplifier will
still consume some power . Therefore discon-
nect the plug from the mains socket and, if
required, disconnect the emergency power
supply unit if the amplifier is not used for a
longer period .
5.10 "Ground / Lift" switch
If there is a ground loop when all devices have
been installed (e . g . from the housing of the
amplifier via a rack to another housing of a
device), humming will occur (audible in par-
ticular during music passages of low volume) .
This ground loop can be interrupted with the
"Ground / Lift" switch (29) on the rear panel
of the device . For this purpose, set the switch
to "Lift" . Humming should stop after that .
On the other hand, the amplifier is not
shielded from electric noise fields if the hous-
ing is not grounded . In this case, set the switch
to "Ground" . In case of doubt, set the switch
alternately to find the optimum position .
6 Operation
When the amplifier is switched off and con-
nected to the supply voltage, the LED "stand
by" (11) will light up .
1) Prior to switching on the amplifier for the
first time, set all five input controls INPUT-1
to INPUT-4, AUX (8) and the MASTER con-
trol (9) to zero .
2) Switch on the amplifier with the POWER
switch (14) or with a switch connected to
the terminal strip AC POWER REMOTE (26) .
The LED "stand by" will be extinguished,
and the LED "power" (12) will light up .
6.1 Adjusting the volume
1) For the time being, set the control
INPUT (8) of the signal to be heard at the
highest volume to position 7 (e . g . INPUT-1
for emergency announcements in chan-
nel 1 of top priority) .
2) Set the attenuator ZONE ATTENUATORS (6)
of the zone to be provided with the sound
of the highest volume to position 5 .
3) Make an announcement via the corre-
sponding microphone and adjust the
maximum desired volume with the MAS-
TER control (9) . However, the LED "clip"
of the VU- meter (10) must not light up;
otherwise, this will result in overload and
distortion of the amplifier . In this case, turn
back the MASTER control accordingly .
If the desired volume is not reached
and the LED "clip" does not yet light up,
advance the corresponding control INPUT
further .
2
4) Then, while an announcement is made,
also adjust the volume of the other zones
with the attenuators (6) .
5) Adjust the volume of further microphones
and signal sources with the corresponding
controls (8) . Always set the controls of the
unconnected channels to zero .
6) For selecting a device connected to the
jacks AUX INPUTS (19), actuate the selec-
tor switch "5 6 7" (3) . For this purpose,
first set the control AUX to zero to prevent
switching noise .
7) Adjust the sound with the two controls
"Bass" and "Treble" (4) . Adjust the sound
for an insertion in the compartment (1)
with the controls PACK (5) .
8) For temporary sound interruption in cer-
tain zones, set the corresponding attenu-
ators (6) to "off" .
6.2 Automatic volume attenuation
– A signal in channel 1 will take priority over
all other signals, i . e . the volume of the other
signals will be automatically attenuated if
you speak into the microphone of channel 1 .
– When the talk button of the microphones
PA-5000PTT is pressed, the volume of the
AUX channel will be automatically atten-
uated .
– The input signals will also be attenuated if
the siren or the chime is activated .
6.3 Chime and alarm siren
The chime can be activated, e . g . prior to an
announcement, with the key CHIME (2), with
a momentary pushbutton switch connected
to the terminals "Remote Chime" (30), and
with the talk button of a PTT microphone .
The siren can be activated via a switch con-
nected to the terminals "Remote Siren" (30) .