Step 5: Install Reserve Power - Toshiba DK14 Installation And Maintenance Manual

DK424i Installation

Step 5: Install Reserve Power

Step 5: Install Reserve Power
Two or four customer-supplied, 12VDC batteries (80 amp hours maximum) can be connected to
the system as a power failure backup. In the event of a power failure, the system automatically
switches over to battery power without any interruption to existing calls or other normal system
functions.
Important!
The length of time reserve power operates depends on the system, size and number of batteries
provided, and the system load. Typical reserve power duration estimates and battery specifications
are estimated with the following considerations (see
Batteries have full charge at start of operation.
o
o Two or four batteries connected per
o Batteries are 12VDC, rated at 80 amp/hours each.
o System is operating at full load traffic with LCD phones.
o Batteries used for this test are gel-cell and maintenance-free. Reserve duration will vary
depending upon battery type, age, and manufacturer. These figures should only be used as an
estimate.
Table 7-7 Typical Reserve Power Duration Estimate
Number of Cabinets
Estimated operation time
Two-battery configuration
Estimated operation time
Four-battery configuration
WARNING! Some batteries can generate explosive gases. Therefore...
The procedure for installing reserve power varies, depending on the number of cabinets in the
system and the mounting method employed in installing the cabinets. The following text details
reserve power battery installation requirements.
WARNING! Battery cables that exit the cabinet(s) are not UL listed because of
7-26
Batteries must be connected when normal AC power is available; they cannot be
connected during an AC power failure situation.
1
12 hrs.
24 hrs.
Ensure that batteries are located in a well-ventilated area.
Do not smoke near batteries.
Avoid creating any electrical sparks near batteries.
Use commercially available battery enclosures to reduce risk to nearby
people and equipment.
possible incorrect installations. Have a licensed electrician install these
cables.
Table 7-7):
Figure 7-16.
2 3
6 hrs. 4 hrs.
12.0 hrs 8 hrs
4 5
3 hrs. 2.5 hrs.
6 hrs. 5 hrs.
Strata DK I&M 5/00