Connecting The Amplifier; Protective Circuits - Monacor PA-4120 Bedienungsanleitung

4 3 2
SPEAKER OUTPUTS
9

4 Connecting the Amplifier

All connections should be made by skilled per-
sonnel only . Always switch off the amplifier
before making any connections!
4.1 Speakers
PA speakers (fig . 1, page 3) or 4 Ω speakers or
speaker groups with a total impedance of at
least 4 Ω (fig . 2) can be connected .
Important! The speaker outputs are factory-set
to 100 V speakers . By means of jumpers, each
channel can be separately changed to 70 V,
50 V or 4 Ω speakers . In case of a mismatch, the
amplifier and the speakers will be damaged!
If in doubt, check the current arrangement .
To change the factory-set arrangement,
release the three screws (10) for the mounting
plate with the speaker connections (9) . Carefully
pull the mounting plate until the jumpers are
visible . Do not pull off any cables! Using the
jumpers, select 70 V, 50 V or 4 Ω . This modifi-
cation must be made by skilled personnel only!
4.1.1 PA speakers
If no 100 V speakers are used, change the
speaker outputs prior to connection (see chap-
ter 4 .1) . The possible connections for PA speakers
are shown in figure 1 (page 3) .
Caution! When PA speakers are used (fig . 1),
the total load by the speakers must not exceed
120 W RMS (PA-4120) or 240 W RMS (PA-4240)
per channel; otherwise, the amplifier will be
overloaded and may be damaged .
For each zone, connect the speakers in
groups to the speaker terminals (9) . Observe the
correct polarity (positive and negative connec-
tions as shown in fig . 1) . The positive connection
of the speaker cables is always specially marked .
4.1.2 4 Ω speakers or speaker groups with a
total impedance of 4 Ω
Before making any connections, change the out-
puts to 4 Ω mode (see chapter 4 .1) . For each
amplifier output, fig . 2 (page 3) shows a differ-
ent possibility of how to obtain an impedance
of 4 Ω with the corresponding speakers .
Connect the speakers or speaker groups for
each zone to the speaker terminals (9) . Observe
the correct polarity (positive and negative poles
as shown in fig . 2) . The positive connection of
the speaker cables is always specially marked .
4.2 Inputs
Each channel can receive a separate input signal
via the XLR jacks (13) or the screw terminals (14) .
However, an input signal can also be routed to
multiple channels . For this purpose, press the
1
10
corresponding buttons ROUTING (12) . With the
button ROUTING 1-2, for example, the input
signal is routed to channels 1 and 2 . When all
buttons ROUTING are pressed, the same input
signal will be available at all channels . In this
case, route the signal to a single input only .
For optimum level control, a signal of
+4 dBu = 1 .2 V is required . The connection of
the signal source to the corresponding input
should be balanced in order to obtain optimum
noise suppression . When the output of the sig-
nal source is unbalanced (e . g . RCA jacks), use
an appropriate adapter (e . g . NA-2MPMF from
MONACOR) for connection via an XLR jack, or,
for connection via the screw terminals, connect
the terminal
the signal to + and connect the ground to GND .
4.3 Remote-controlled switch-on and
switch-off
The amplifier can be switched on and off by
remote control via a separate switch: Connect
the screw connections POWER REMOTE (15) via
a two-pole cable to a single-pole POWER switch .
For remote-controlled switch-on and switch-off,
the main POWER switch (6) must not be pressed .
4.4 Power supply and
emergency power supply
1) Finally connect the plug of the mains cable
(17) to a mains socket (230 V/ 50 Hz) .
2) To ensure continued operation of the am-
plifier after a mains failure, connect a 24 V
emergency power supply unit (e .g . PA-24ESP
from MONACOR) to the terminals 24 V⎓
(16) . Use four cables to connect the ampli-
fier to the emergency power supply unit . For
each cable with a length of up to 4 m, a cable
cross section of at least 10 mm
or 5 mm 2
CPC-... from MONACOR) .
POWER REMOTE
PA-24ESP
Notes: When a 24 voltage from an emergency
power supply unit is applied to the connections
24 V⎓, it will not be possible to switch off the
amplifier with the POWER switch (6) . In case of
a mains failure or when the amplifier is switched
11 12 13 14 15
− to the terminal GND . Connect
(PA-4240)
2
(PA-4120) is required (e . g . series
24V⎓/ 60A – PA-4120
MAX
113A – PA-4240
MAX
2 1 2 1
− 24 V +
BATTERY
FULL
80 %
60 %
40 %
CHARGING
AC DC
EMERGENCY POWER SUPPLY UNIT
POWER
ROUTING ROUTING ROUTING
3-4 2-3 1-2
CH 4 CH 3 CH 2 CH 1
GND GND GND
POWER REMOTE 24 V/113 A
MAX
2 1 2 1
230 V~/50 Hz
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off, it will automatically switch to emergency
power supply .
Even when the amplifier is switched off, it will
have a low power consumption . Therefore, dis-
connect the mains plug from the mains socket
and, if required, disconnect the emergency power
supply unit when the amplifier is not used for a
longer period of time .
5 Operating the Amplifier
When the amplifier is switched off and mains
voltage is applied, the LED indicator STAND
BY (7) will light up .
1) First set all four controls LEVEL (4) to the
position "0" .
2) Switch on the amplifier with the POWER
switch (6) . The LED indicator STAND BY will
extinguish and the LED indicator AC (5) will
light up . In case of mains failure with the
emergency power supply available, the LED
indicator DC will light up instead of the LED
indicator AC .
If the amplifier is to be switched on and
off by remote control via a separate switch
(see chapter 4 .3), the button POWER must
not be pressed .
3) Adjust the level controls (4) for all channels
(zones) to the desired volume values . Each
channel provides a level indicator (3) . In case
of overload, the corresponding LED indicator
CLIP will light up . In In this case, reduce the
volume with the corresponding control .

6 Protective Circuits

At the inputs, the amplifier is protected against
rumble noise by a 50 Hz high-pass filter and
against high-frequency interference by a 30 kHz
low-pass filter . Protective circuits against over-
load and overheating are also provided . When a
protective circuit is activated, the LED indicator
PROT (2) will light up and the corresponding
channel will be muted:
1 . for approx . 1 second after switch-on
(switch-on delay)
2 . for approx . 1 second after switch-off
3 . when the amplifier is overloaded
4 . when the amplifier is overheated; additionally,
the LED indicator TEMP (1) will light up .
If one of the LED indicators PROT lights up dur-
ing operation or if it does not extinguish after
switch-on, switch off the amplifier and eliminate
the fault .
Specifications ☞ page 18
Subject to technical modification .
BALANCED INPUTS
+4 dBu/1.23 V 30 kΩ
GND
17
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