Reserve power 51
Alarm Monitoring
^
A UPS to System Monitor Alarm cable is available from Northern Telecom
for
each
of the recommended UPS vendors. The alarm interface consists of an
“inverter on” signal to indicate that the commercial power is down and the
UPS is supplying power to the system, and a “summary
a@m”
signal from the
UPS to indicate a fault or alarm condition. The cables are listed below:
Table 18
UPS to System Monitor Alarm cables
UPS
vendor
Alpha Technologies
Best Power Technology
Exide Electronics
NT
part number
NT8D46AU
NT8D46A.I
NT8D46AQ
Installation
For UPS installation information, refer to the appropriate UPS vendor
installation manual. It is recommended, however, that a UPS bypass switch
be installed during the initial wiring if this switch function is not inherently a
part of the UPS itself. The UPS bypass switch allows for the PBX to be run
directly from commercial AC power while the UPS is taken off line during
installation or service, or during battery maintenance.
I1
CAUTION
Proper care must be taken when connecting the DC battery leads to
the UPS. A battery reversal at the UPS can result in severe damage
to the UPS.
A general block diagram of a UPS installation and associated wiring is shown
in Figure 14.
Power engineering 553-3001-I 52