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Battery charging in AC-powered systems
Table 65
NTAK04 or NTDK78 AC/DC power interface to reserve power systems
Float Voltage
Charge Current
a. The charge current available to the reserve batteries depends on the system configuration and the line size.
Reserve time
Table 66
Reserve time
Duration of Power Failure
30 – 40 minutes
1.5 – 2 hours
3 – 4 hours
Features of the Option 11C Mini power supply
553-3011-100
Standard 14.00
Power supplies
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 Table 65.
Minimum
52.95 Volts
a
1.0 Amps
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.
This section describes the Option 11C NTDK15 Mini AC power supply.
January 2002
Nominal
53.6 Volts
—
AHRs required per Option 11C cabinet
6 AHR
12 AHR
25 AHR
Maximum
54.50 Volts
7.0 Amps
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