13
DPU 1125C - DPU 1250C - DPU 1500C
A U D I O C O N T R A C T O R
3.5 Connection to external power supply
The terminal block (
6
) enables connection to an external DC power supply (Fig. 3.5.1) and to a relay (Fig. 3.6.1).
There are three operation modes of the test relay.
In the fi rst mode (
MODE 0 – factory setting
), the test relay is always energized and is de-energised only in the absence of power or in case
of failure of the amplifi er. It this mode it is possible to use the PM2095 card to set up a system of several amplifi ers with automatic inclusion of
one or more standby units.
In the second mode (
MODE 1
), the test relay is always energized and is de-energized only if there is a failure on the loudspeaker line.
In the third mode (
MODE 2
), the test relay is always energized and is de-energized if there is a line or amplifi er failure.
The sequence to be carried out to set the various modes by means of the dip switch on the card is illustrated below. The levers must be lowered in
sequence (not simultaneously).
ON
1
2
3
4
5
6
7
8
A
B
ON
1
2
3
4
5
6
7
8
C
ON
1
2
3
4
5
6
7
8
D
ON
1
2
3
4
5
6
7
8
MODE 0
ON
1
2
3
4
5
6
7
8
A
B
ON
1
2
3
4
5
6
7
8
D
ON
1
2
3
4
5
6
7
8
C
MODE 1
ON
1
2
3
4
5
6
7
8
ON
1
2
3
4
5
6
7
8
A
B
ON
1
2
3
4
5
6
7
8
D
ON
1
2
3
4
5
6
7
8
C
MODE 2
ON
1
2
3
4
5
6
7
8
Amplifier failure
Line failure
Amplifier or line failure
3.6 Volume control
The output volume can be adjusted simply by turning the trimmer (
14
) provided for this purpose on the rear side of the equipment. It can be
turned with a small screwdriver. In a clockwise direction the volume is increased while in an anticlockwise direction the volume is decreased.
A) ‘STAND ALONE’ Mode
In this mode, it is necessary to set some parameters using the ‘
MODE SEL.
’ (
12
) dip-switch provided for this purpose on the rear of the amplifi er.
Lever 1 of the dip-switch has an ‘Enter’ function
. That is to say, it has to be used to conf rm the choices opted for with the other levers.
• Loudspeakers line impedance acquisition
Once the loudspeakers lines has been permanently installed, and the amplifier has been connected as indicated in the chapter on
‘Installation
and connection’
, it is necessary for the amplifier to acquire the current impedance. This impedance value will be used as a reference for the future
measurements. If the results of the measurements exceed the reference value by ±30%, the amplifier will signal the problem that has been
detected by means of the LED. To acquire the reference impedance value, proceed as follows:
1. Switch on the amplifier.
2. Operate the dip switch by moving lever
8
to the
ON
position and then lever
1
as shown in Figure
4.1.1.
After about 2 seconds the green ‘
OK
’ LED will remain steadily on to indicate correct acquisition
of the line impedance.
3. Return levers
1
and
8
to the
OFF
position: the green LED will extinguish.
4.
SETTINGS
4.1 Operating modes
There are two possible operating modes enabled:
• ‘STAND-ALONE’ Mode;
• ‘REMOTE CONTROL’ Mode
The settings and the changes that can be applied to the amplifi er in each of the operating modes are described in the following paragraphs.
Fig. 4.1.1
Fig. 3.5.1
Fig. 3.5.2
Summary of Contents for DPU Series
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