Operating instructions

Bosch Security Systems | 2003-09 | 3922 988 99482en
Plena Universal Pre-amplifier | Installation and Operating Manual | en | 12
4 External settings and connections
Figure 4.1
4.1 Connect the DC supply (battery)
The universal pre-amplifier has a 24 Vdc input (terminal screw), which you can use to connect a back up power
supply, e.g. batteries. You can earth the unit to increase the electrical stability of the system. The unit is protected
against reversal of the battery polarity.
Caution
The connection cable must have an in-line fuse. Use the type of fuse as mentioned in the illustration.
External settings and connections
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F = 1.5A