Nortel Networks Option 11C Features of the Option 11C M ini power supply

Page204 of 544 Powersupplies

553-3011-100 Standard14.00 January 2002

Uninterrupted Power Supply (UPS)

A 750VA Uninterrupted Power Supply (UPS) may be connected to AC-

powered systems in order to provide a continuous supply of AC-power.

If two cabinets are equipped, two 750VA UPSs or one 1.5KVA UPS can be

used.

During normal operation, the AC/DC power supply (NTAK04 or NTDK78)

provides a constant float voltage to the reserve batteries. This charger voltage

is not adjustable and will not provide equalization voltages. See Table65.

Table66 outlines the Ampere hours required (AHR) per cabinet during a

power failure. The reserve times are based on nominal load for a typical

installation.

Features of the Option 11C M ini power supply

This section describes the Option 11C NTDK15 Mini AC power supply.

Table 6 5

NTAK04 or NTDK78 AC/DC power interface to reserve power systems

Minimum Nominal Maximum

Float Voltage 52.95 Volts 53.6 Volts 54.50 Volts

Charge Currenta

a. The charge current available to the reser ve batteries depend s on the system co nfiguration and the line size.

1.0 Amps —7.0 Amps

Table 6 6

Reserve time

Duration of Power Failure AHRs required per Option 11C cabinet

30 – 40 minutes 6 AHR

1.5 – 2 hours 12 AHR

3 – 4 hours 25 AHR