Mitel SX-2000 - Manual (Page 75)

Configuration
50003510 Revision A 61
Uninterruptible Power Supply (UPS)
The uninterruptible power supply (UPS) is a reserve power supply for the control cabinet and
digital peripheral cabinets comprising of a battery pack, a charger, and an inverter. The UPS
backup time is dependent upon the unit selected and the capacity of the batteries provided.
The unit must be able to provide 115 Vac at 15 A.
Mitel Networks Corporation does not manufacture a UPS . Mitel Networks has evaluated several
uninterruptible power supplies (UPS) that are compatible with the SX-200 system. Marketing
and sales literature available from authorized representatives identifies these products.
The UPS should be a true uninterruptible power supply that always supplies the output load
from its inverter and includes a reverse transfer switch to automatically bypass the UPS if it
fails. The UPS must be capable of driving rectifier capacitor loads.
An uninterruptible power supply (UPS) can have an external connection (from an internal relay)
that provides a closed contact to remotely indicate status or condition. Conditions which may
be indicated include
• An alarm condition is present within the UPS
• The UPS is operating from its batteries (probably because commercial AC power has been
interrupted).
The relay contact can be connected to a remote alarm or to a contact monitor line circuit to
promptly indicate the condition. Refer to the manufacturer’s installation manual for descriptions
of conditions that are indicated. Compliance to electrical, installation, and building codes is the
responsibility of the purchaser of the equipment.
System Fail Transfer
The SFT maintains telephone service in the event of system failure (such as a power outage).
When the system goes into SFT mode, the SFT unit connects up to six internal POTS telephone
extensions directly to the CO, bypassing the system completely.
The SFT is an optional, stand-alone, wall-mounted device that connects to the system’s
peripheral cabinet or main distribution frame (MDF). Each SFT can control six circuits, and up
to four SFTs can be daisy-chained together for each zone, providing security for 24 internal
extensions.
The SFT switches to SFT mode under the following conditions:
• Failure of the system power converter
• Failure of the system main control (in a redundant system, both main control planes must
fail, causing a critical alarm to all zones)
• Interruption of the system AC power
• Failure of the peripheral switch controller (zone)
• Loss of the fiber link between the main control and peripheral cabinets.