Crown Audio S Series Fault Monitoring, Advanced Features and Options, S-Series Power Amplifiers

S-SeriesPower Amplifiers

4 Advanced Features

and Options

4.2.2 Fault Monitoring

The Fault (RJ-11) jack, which looks like a telephone jack, is located on the back of your S-Series ampli- fier (Figure 4.2). It gives you an easy way to remotely monitor the amplifier’s fault status. To set up a circuit that will cause an LED to light whenever a fault status occurs, you can simply use the sug- gested circuit shown in Figure 4.3.

When using this circuit, the LED will glow under any of these conditions:

•The amplifier has just been turned on and is still in the 4-second turn-on delay.

•The heatsinks are too hot.

•The transformer thermal protection is activated.

•The amplifier output wires have developed a short circuit.

•The limiter has been overdriven by > 6 dB for a long time.

•The amplifier output stage has stopped operating. Refer the unit to an authorized Crown Service Cen- ter.

•The amplifier is turned off.

If you choose to design your own circuit to interface this signal to your system, note that this RJ jack is polarity sensitive. Pin 2 must be grounded, and Pin 5 must be supplied with a positive voltage pull-up (positive with respect to ground). Refer to Figure 4.4 for RJ jack pin assignments. The maximum signal that can be exposed to the Fault jack is 35VDC and 10 mA. Best results are obtained with 10 mA LEDs.

The mating connector for the S-Series TX RJ-11 jack contains 4 contact pins in a 6-slot case, as shown. For additional information please contact your local dealer or Crown Technical Support.

Figure 4.2 Location of Fault Jack

Figure 4.3 Fault Status LED Circuitry

Figure 4.4 RJ-11 Jack Wiring and Pin Assignments

Operation Manual page 17