Specifications

Issue 6 February 2007 409
● 10 minutes in the control carrier in a standard reliability system
● 5 minutes in the control carrier in high reliability and critical reliability systems
● 10 minutes in the expansion control carrier that resides in the A position of an EPN cabinet
The following figure shows an example of the small batteries.
Figure 89: Small battery assembly
Large batteries
The large batteries provide holdover times of 2 to 8 hours, depending on the number of
batteries. To use large battery holdover, one battery cabinet is required per system. The 24-cell
battery cabinet must have a float voltage of 54.2-VDC. The 23-cell battery cabinet must have a
float voltage of 51.75 VDC. A circuit breaker protects the batteries. The J58890CH-1 charges
the batteries.
The batteries also contain a thermal sensor that changes the charging voltage, depending on
the battery temperature. The following table shows the battery holdover and recharge times for
a typical 2500-watt load.
Battery cabinet (A) Holdover time
(hours)
Recharge time (hours)
100 2 7
200 4 13
300 6 20
400 8 26
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Battery
connector