Backup Amplifier - Mircom FleXNet FNC-2000 Installation And Operation Manual

Backup Amplifier

Any amplifier may be designated as a backup amplifier when backup is required. It should be installed in any audio
cabinet and in the right-most slot position of a QMB-5000B backplane.
Figure 62: QAA-5160-70/25 Amplifier (Backup Application)
MOLEX CONNECTOR
MD-789 MUST BE CONNECTED
ON BOARD HERE TO USE
AMPLIFIER AS A BACKUP
HEAT SINK HEAT SINK
XMFR
RELAYS
CAPACITORS
SPEAKER
TERMINALS
FleX-Net
Any amplifier may be designated as the
backup amplifier and this backup amplifier
must have the MD-789 molex connector
placed in the bottom left-hand corner of
the board as shown in the adjacent figure.
The QAA-5160-70/25 as backup amplifier
is inserted into the motherboard. No
connections are made to the backup
amplifier's terminals except for end-of-line
resistors which are to be placed directly on
the terminals in the audio cabinet.
Once the Backup Amplifier is installed, it
must be properly configured. Refer to the
Audio Configuration for details.
The number of backup amplifiers is limited
to one per node. Only the first failed
amplifier gets the backup. The distance
from the farthest audio cabinet to the
audio cabinet (which has the backup
XMFR
amplifier) cannot be greater than four
cable lengths (approximately 208 inches
or 17 feet).
TM
Installation and Operation Manual
95