Operation - Monacor PA-5240 Instruction Manual

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) .