Plena Power Amplifier | Installation and User Instructions | Operation
ON and OFF
Put the power switch on the rear of the power amplifier
(see figure 5.1) in the I position.
If mains power or back-up power is available, the
VU-bar (1) on the front of the power amplifier is lit and
shows the output level of the amplifier (see figure 5.2).
If the internal temperature reaches a critical limit due to
poor ventilation or overload, an overheat protection
circuit switches OFF the power stage. The Overheat
indicator (5) shows on the front panel and a signal is
given on the Input fault relay if the power stage is
switched OFF by the overheat protection circuit.
The Battery operation indicator (3) lights up if the mains
power supply is failing and the back-up battery is in use.
Plena Booster Amplifier
figure 5.2: Front panel LBB1938/20
Put the power switch of the power amplifier (see figure
5.1) in the O position.
Bosch Security Systems | 2006-11 | 9922 141 50751en
figure 5. 1 : Power switch
en | 19