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FAULT
PROTECT
CLIP
1
SIGNAL
ON
STAND BY
SLEEP
PRIORITY
4 Fault detection module
PA-6FD
PA-1500D
MONO CLASS D PA MIXING
AMPLIFIER
MONACOR INTERNATIONAL
4.1 Function
The fault detection module PA-6FD (available
as an accessory) is specially designed for this
GND
4
amplifier . It will generate a 20 kHz sinusoidal
test tone which is fed to the power ampli-
fier . If there is a fault in the amplifier and
the test tone is not applied to the speaker
terminals (10), the LEDs FAULT and PROTECT
(1) will light up . Furthermore, the green LED
(15) on the rear of the amplifier will go out .
A relay can be used to additionally activate
a signal device .
4.2 Installation and connection
WARNING The module must be installed
by skilled personnel . Always
disconnect the mains plug
from the socket before you
open the amplifier; otherwise,
you will risk an electric shock!
If an emergency power supply unit is con-
nected, disconnect it from the terminals
24 V ⎓ (8) to make sure that the amplifier is
not in operation .
ON OFF
SW 1
CN601
Fault Detector
COM HOT
PA-6FD
Line In
a
b
1) Unscrew the housing cover of the amplifier
and remove the cover plate (19) . Discon-
nect the 4-pole cable that is fixed to the
cover plate .
2) Set the jumper SW 1 on the module to the
position ON .
8
2
OCP RESET
3) Insert the module at the position of the
cover plate from the outside and screw
it on .
•
ZUM FALSCH 36
•
28307 BREMEN
•
GERMANY
4) Connect the 4-pole cable that was fixed
T6.3AL
230 V~/50 Hz
230 V~ / 50 Hz / 1015 VA
24 V /35.5 A
to the cover plate to the jack CN 601 of
POWER
the module . Make sure that the upper pin
REMOTE
of the jack is not connected, see figure of
FUSE
the module .
5) Connect the terminal strip
5
6
7
amplifier to the terminal strip "Line In" (b)
of the module as follows:
PA-1500D
6) Set DIP switch No . 3 (14) to the upper
position OFF (= FAULT) .
7) When the module detects a fault, the LEDs
FAULT and PROTECT (1) will light up and
the relay contact
tact can be used to connect a signal device
for triggering an alarm . The current rating
of the relay contact is 1 A at ~ 120 V max .
or ⎓ 24 V max .
Note: The relay contact will also close when the
amplifier is switched off .
4.3 Calibration
PA-6FD
An oscilloscope or a voltmeter is required
which is able to measure alternating voltage
up to 20 kHz min .
1) Make sure that there is no signal at the
amplifier inputs PGM INPUT (13) and PRI-
ORITY INPUT (18) . Disconnect the terminal
strips, if necessary .
2) Switch on the amplifier and measure the
20 kHz test tone at the speaker terminals
OSC Level
min.
max.
Sensitivity
Level (d) to set the level to 2 V (5 .6 V
3) Turn up the trimmer potentiometer Sensi-
Sense
tivity (e) until the LED Sense (c) lights up .
From this position, turn the potentiometer
c
d
e
to the scale mark after the next . The LED
may flicker during operation; this is not
a fault .
4) Switch off the amplifier . Reconnect the
terminal strips to the inputs PGM INPUT
and PRIORITY INPUT . The amplifier is now
ready for operation .
500
24 V /35.5 A
BALANCED
OUTPUTS
FUSE RATING
T40AL
40
BALANCED
OUTPUTS
8
9
10
PA-1500D
PA-6FD
BALANCED
OUTPUTS
COM HOT
(a) –
Line In
PA-6FD
BALANCED
OUTPUTS
COM HOT
(a) will close . The con-
(a) –
– (b)
Line In
. Use the trimmer potentiometer OSC
BALANCED
OUTPUTS
5 Setting up and Connecting
the Amplifier
The amplifier is designed for installation into a
rack (482 mm / 19"), but it can also be placed
WRMS
on a table . To ensure sufficient cooling of the
PRI
PGM
RELAY
INPUT
power amplifiers, air must always be able to
12
G
flow freely through all air vents .
LEVEL
0
10
(10) of the
CONTACT
0dBu (0.775 V)
5.1 Rack installation
MAX 1A
30 kΩ BAL
11
13 14 15 16
For installation into a rack, 2 RS (2 rack spaces
= 89 mm) are required . To prevent the rack
from becoming top-heavy, insert the amplifier
into the lower section of the rack . The front
panel alone is not sufficient for fixing the
amplifer safely; additionally use lateral rails or
a bottom plate to secure it .
The heat produced by the amplifier must
– (b)
be dissipated from the rack; otherwise, heat
will accumulate in the rack which may not
only damage the amplifier but also other units
in the rack . In case of insufficient heat dissipa-
tion, install a ventilation unit (e . g . DPVEN-04)
into the rack .
5.2 Connecting the amplifier
Connections must be made by skilled per-
sonnel only . Always switch off the amplifier
before connecting!
Note: To make handling easier, all green terminal
strips can be disconnected from their plug-in con-
nections .
5.2.1 Speakers
Connect the PA speakers to the terminal strip
(10) . Make sure that the polarity is the
BALANCED
OUTPUTS
same for all speakers (e . g . COM = negative
terminal) . The speakers must not exceed the
total load of 500 W; otherwise, the protective
circuit will respond and mute the amplifier .
5.2.2 Line signal inputs
For announcements and music reproduction,
a PA preamplifier (e . g . PA-1414MX) or a zone
mixer (e . g . MPX-4PA, PMX-52PA) is required
) .
pp
which can be used to connect microphones
and audio units (e . g . CD player, radio set) .
Connect the output of this unit to the input
PGM INPUT (13) .
For emergency announcements or other
important announcements, PA-1500D is
equipped with the input PRIORITY INPUT (18) .
As soon as a priority switch or a relay con-
nected to the terminals PRI CTL / GND (16) is
closed, the amplifier will switch over from
the input PGM INPUT to the input PRIORITY
PA-1500D
3
POWER
PA-6FD
19
FAULT DETECTION MODULE
FD/PRIORITY
PRIORITY
CONTROL
INPUT
17
OUT
PRI
OFF: FAULT
CTL
G
ON: NORMAL
24V
GND
PA-6FD
LEVEL
1 2 3
ON
0
10
200 Hz
0dBu (0.775 V)
MAX 0.1A
SLEEP
30 kΩ BAL
18
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