Table 16 Wiring Chart For 70V Speakers - Mircom FLeXNet FX-MNS-6000 Installation And Operation Manual

9.16.5 Backup Amplifier Wiring
Any amplifier may be designated (through configuration) as a backup amplifier per node when
backup is required. Use of 25V or 70V must be restricted to one or the other per node. The
backup amplifier can be any amplifier installed in any audio cabinet per each node.
The number of backup amplifiers is limited to one per node. Only the first failed amplifier gets
the backup. The backup amplifier is set up by configuration. Select one amplifier on a
backplate and it will be a backup for the other amplifier circuits on the QMB-6000. To backup
any other amplifiers on the next backplate, the designated Backup Amplifier must be wired A+
and A- to the + and - terminals of the Backup Bus Supervision Continuation terminals and the
other + and - terminals of this connector to the next backplate. The End of Line resistor for the
backup amplifier should be connected at the last backplate.
B- A- A+ B+ B- A- A+ B+ B-
1.2 1.4
1.1 1.3
Table 16
Total
Power
Watts
25
50
75
100
i
Notes for Wiring Charts: For each speaker zone, select the total zone power. Distance
shown is calculated to the last speaker, based on the worst case with all speakers lumped
at the end. Calculation is base on a 1db power loss (20%) and a source of 70V or 25V.
A- A+ B+ B- A- A+ B+ B- A-
2.2 2.4
2.1 2.3
Wiring Chart for 70V Speakers
Maximum Wiring Run To Last Device (ELR)
18AWG
ft m
1740 531
970 266
580 177
435 133
TNC-5000 Telephone Network Controller Module
Wire the designated backup amplifier
to the Backup Bus terminals
A+ B+
B- A- A+ B+
B- A-
3.2
3.4 4.2
3.1
3.3
4.1
16AWG 14AWG
ft m ft
2966 841 4399
1383 421 2200
922 280 1466
691 210 1100
- + - +
B- A- A+ B+
A+ B+
Backup Bus
4.4
Supervision
4.3
Continuation
Terminals
12AWG
m ft
1342 6995
671 3497
447 2332
335 1749
Wire this to
the next
backup bus
continuation
terminals of
the next
backplane
m
2132
1066
711
533
90