Bosch Appliances 3.5 manual 10.5Installation, Operation, 17: Installation, 5: Mains LED status

Praesideo 3.5 Installation and User Instructions 4 Amplifiers

en 177

10.5Installation

The basic amplifier is suitable for only 19-inch rack installation.

10.6 Operation

The front panel of the amplifier has LED indicators that show the status of the amplifier channels, battery back-up, mains supply and supervision. See the table

10.5and table 10.6 for the descriptions of the status LEDs.

The LED indicators will show the fault status of the mains supply and battery supply if supervision is enabled with the supervision switches (9 in figure 10.2). This status is always transferred to the multi channel interface, even if the switches are in the Off-position. The switches only control the LED indicators, e.g. for stand-alone use.

figure 10.17: Installation

Ensure there is enough space for the cool air flow to enter and the warm air flow to leave the basic amplifier.

table 10.5: Mains LED status

Mains	Mains	Mains supervision
LED		enabled
Green	Present	X
Yellow	Not present	Enabled
Off	Not present	Off

figure 10.18: Air flow in a 19" rack

Caution

When mounting the brackets to the unit, use the screws that are supplied with the brackets, four longer ones and two shorter ones. Use two screws of 7.5 mm thread length at the front side of each bracket, use a short screw of 5.2 mm thread length at the rear side of each bracket. Do not use screws with a thread length of >10 mm for the front positions or screws with a thread length of >5.7 mm at the rear postion; longer screws may touch or damage internal parts of the unit.

table 10.6: Battery LED status

Battery	DC back-up	DC back-up supervi-
LED		sion enabled
Green	Present	X
Yellow	Not present	Enabled
Off	Not present	Off

The amplifier channel LED indicators show the status of each amplifier channel independently. Each channel has four indicators, one yellow and three green. See table 10.7 for the descriptions of the status LEDs for the amplifier channels.

table 10.7: Channel LED status

Channel LED status	Output level
Yellow	0 dB / Fault *
Green	- 6 dB
Green	- 12 dB
Green	- 20 dB

Note

The yellow channel LED indicates clipping of the signal when the green LEDs are also on, otherwise it indicates a fault situation such as overheat or a short circuit.

Bosch Security Systems 2011-02