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Page 204 of 544 Power supplies
553-3011-100 Standard 14.00 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.
Battery charging in AC-powered systems
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 Table 65.
Reserve time
Table 66 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 Mini power supply
This section describes the Option 11C NTDK15 Mini AC power supply.
Table 65
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 Current
a
a. The charge current available to the reserve batteries depends on the system configuration and the line size.
1.0 Amps — 7.0 Amps
Table 66
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