Connection Of The Vca Control; Indicators - Ecler MPA4-150R Manual De Instrucciones

4.4. Connection of the VCA control

As already mentioned in the introduction of this manual, the signal attenuation level for each of the
input channels can be set using the following methods:
a) Using a remote potentiometer with nominal resistance between 10k and 50k.
b) Using a device that generates a control voltage from 0 to 10V DC.
c) Using remote relays/dry contacts.
NOTE: it is possible to connect a maximum of 16 inputs to one control potentiometer. It is
necessary that the ground terminals of all amplifiers are connected.
The connection cables can be up to 500m long if a section of 0,5mm
Consult the available accessories at your ECLER dealer or at www.ecler.com.
Remember that the VCA circuit is disabled by default. If you need to use it, you have to activate it
using the internal jumpers (see configuration diagram).

4.5. Indicators

The SP signal presence indicators (3, 6, 9, 11, 14, 17) light up when the input signal reaches
approximately -40dBV.
The CLIP indicators (2, 5, 8, 12, 15, 18) light up when the output signal for the speakers is -1,5dB
below the actual clipping threshold. This clipping system watches for eventual supply voltage variations,
thus giving always an accurate clipping indication, regardless of mains voltage deviations. It is normal
that when operating at high output power, the CLIP indicators light up in synchronisation with the low
frequencies, which carry the most energy. Nevertheless, you should avoid that the CLIP indicators are lit
continuously.
Thermal protection indicator "THERMAL" (19), it shines when the cooling tunnel temperature
reaches 90ºC. The amplifier will automatically restart when the temperature lessens to 80ºC.
14
2
is used.