Plena Power Amplifiers
Put the power switch on the rear of the power amplifier in the "I" position.
Figure 8.1: Power switch and power connection
Figure 8.2: LBB 1930/20 LBB 1935/20, LBB 1938/x0
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.
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 the Input fault relay switches over 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.
Bosch Security Systems B.V.
Installation and Operation manual
Operation | en
2014.01 | V1.1 | LBB193x/x0