Ac Mains Supply; Audio Inputs - Bosch LA3-VARI-B Installation Manual

VARI-directional array
Connection
Audio input 1 (line
level)
Audio input 1 (100 V)
Audio input 2 (line
level)
Audio input 2 (100 V)
Backup DC power
Failure relay
Control input
RS-485 network in
RS-485 network thru
CobraNet® input
4.2.1

AC mains supply

For ease of installation, the VARI base unit is delivered with a rewireable angled IEC mains
power cable connector. Only this connector may be used and should be fitted to a power cord
of the required length. Refer to section Connector and wiring details, page 23.
4.2.2

Audio inputs

The VARI base unit provides two input channels that accept audio signals at either line level (0
dBV), or from a 100 V line speaker distribution system. Use the line level inputs if the signal
source is a standard item of audio equipment such as a mixer. Use the 100 V inputs if the VARI
is being installed as part of a system which uses other 100 V line loudspeakers. The line level
inputs are transformer-balanced, and the 100 V inputs transformer-coupled. For the input type
being used, Input 1 should be connected to the "normal" signal source. Input 2, if used, may
be connected to a secondary audio feed, such as the output of a paging system, spot
announcement player or emergency announcement system.
Refer to section Line level input 1 (4) and 2 (5), page 25 and 100 V input 1 (6) and 2 (7), page
25 for wiring details.
Bosch Security Systems B.V.
Required?
One of these inputs is
always required unless
system uses CobraNet®.
Others are optional.
Optional
Optional
Optional
Optional
Optional
Optional - required when
system uses CobraNet®
Installation manual
Cable type Section
1-pair audio cable Audio inputs,
page 13
2-core speaker cable
1-pair audio cable
2-core speaker cable
2-core mains cable Backup DC power
supply, page 14
2-core low current Failure relay,
cable page 14
2-core low current Control input,
cable page 14
Network cable with 2 RS-485 network,
twisted pairs and page 14
individual screens
CAT-5 network cable CobraNet® input,
page 15
Installation | en 13
2018.06 | V1.3 |