Protective Circuit - Monacor PA-1450D Manual De Instrucciones

6 Operation
1) To prevent switching noise, always switch on
all other units of the PA system first.
2) Before switching on the amplifier for the first
time, set all volume controls INPUT (3) to
zero to avoid that the volume is too high at the
start. Then switch on the amplifier with the
POWER switch (4). The switch lights up as a
power indication.
3) Control the outputs of the signal sources
(e. g. mixer, preamplifier) to the rated level
(0 dB) or to the highest signal level without
distortion.
4) Turn up the control INPUT (3) of the channels
used to the maximum volume desired. Set
the controls of all channels that are not used
to zero.
If one of the red LEDs CLIP (1) briefly
lights up, you have reached the highest pos-
sible volume. If the LED briefly lights up more
frequently, there is overload of at least one
channel of a channel pair. In this case,
slightly turn back the corresponding control.
5) Each channel can be muted separately, e. g.
when background music interferes with an -
nouncements. Press the corresponding but-
ton MUTE (2).

7 Protective Circuit

Each channel pair of the amplifier is equipped
with a protective circuit against short circuit,
overload and overheating. If the protective circuit
has been activated, the corresponding LED
PROT (1) lights up and the channel pair is
muted:
1. shortly after switching on (switch-on delay)
2. shortly after switching off
3. in case of overload or short circuit at the out-
puts
4. in case of overheating of the amplifier
If one of the LEDs PROT lights up during opera-
tion or if it is not extinguished after switching on,
switch off the amplifier and eliminate the fault.
8 Specifications
Model
RMS output power
THD
Input sensitivity for rated power
XLR jacks
RCA jacks
Input impedance
Frequency range
Crosstalk attenuation
S / N ratio
Output circuit
Ambient temperature
Power supply
Mains voltage
max. power consumption
Emergency power supply
max. DC consumption
Dimensions (W × H × D)
Weight
Subject to technical modification.
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manual may be reproduced in any form or by any means for any commercial use.
PA-1450D
4 × 50 W
230 V~/ 50 Hz
300 VA
24 V
9 A
9.5 kg
® INTERNATIONAL GmbH & Co. KG. No part of this instruction
PA-1850D
8 × 50 W
< 0.5 %
550 mV
1 V
20 kΩ
10 – 20 000 Hz
> 45 dB
> 63 dB
class D
0 – 40 °C
230 V~/ 50 Hz
600 VA
24 V
18 A
482 × 90 × 330 mm
2 RS (rack spaces)
12.7 kg
GB
7