Toshiba STRATA DK24 Manual page 70

INSTALLATION-SYSTEM DESCRIPTION
SECTION 200-096-202
FEBRUARY1991
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DC Voltage Output Specifications
. -24VDC; -26.3 w -27.8
. &/DC; +4.5 w +5.5
. -5VDC; -4.5 N -5.5
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Circuit Breakers
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24; -24V
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56; -24V
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96; -24V, +5V
4.10
Reserve Power
4.11
Twocustomer-supplied, 12-volt batteries (80
ampere hours maximum) can be connected in
series to the system as a power failure backup. In
the event of a power failure, the system automati-
cally switches over to battery power without any
interruption to existing calls or other normal sys-
tem functions. 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 are provided in
Table 2-A.
4.12 AToshiba-supplied, g-foot battery cable, part
number PBTC, supports the reserve battery instal-
lation.
CIRCUIT
BREAKERS <
BATTERY
CONNECTOR
\
AC INPUT
RECEPTACLE
VOLTAGE
LEDs
/
POWER
' SWITCH
FlGURE2-7-OK96 POWERSUPPLY
FRONTPANEL
TABLE2-A
TYPICALRESERVEPOWERFUNCTIONESTIMATES
Quantities of PCBs
Installed (Including PCTU)
234567 8 9 IO 11 12 13 14 15
Estimated Operation
Time (Hours)
71 45 31 23 19 16 13.5 11.5 10 9 8 7 6 5
Approximate (-24V) Current
Drain (DC Amperes)
1 1.7 2.4 3.1 3.8 4.5 5.2 6 6.6 7.3 8 8.7 9.4 10
Time is estimated with the following considerations:
(I) Batteries have full charge at start of operation.
(2)
Batteries (2 ea.) are connected in series.
(3) Batteries are 12 VDC, rated at 80 amp/hours each.
(4) System is operating at full load traffic with LCD-type telephones.
(5) Batteries used for this test are gel-cell, maintenance-free batteries. Reserve duration will vary
depending on battery type and manufacturer. These figures should only be used as an estimate.
2-5