Samsung OfficeServ 7400 Technical Manual page 67

OfficeServ 7400
TECHNICAL MANUAL
PART 4. CONNECTING EXTERNAL BATTERIES
This section describes how to connect external batteries to the OfficeServ 7400 system.
4.1 CONNECTING EXTERNAL BATTERIES
CAUTIONS FOR CONNECTING EXTERNAL BATTERIES
External batteries are required to maintain stable operation of the OfficeServ 7400
system in case a power failure occurs. Rated capacity of an external battery is DC 48 V
and 45 AH per cabinet. Batteries should be connected to each cabinet to guarantee
back-up power. A fuse (125 VAC, 5 Amp) should be positioned between the output
terminal of the battery and the cabinet.
Cautions for connecting external batteries
Do not connect external AC power to the system before completing the
connection between batteries and the system. If so, it may cause electric shock
Check the specified polarity (+ or -) to connect external batteries.
To reduce risk of fire and injury to persons, use only a sealed nickel cadmium
or lead-acid battery supply capable of handling a charge current of 0.45A, a
charge voltage of —56 VDC and a discharge rate of 45 Ah.
The power supply provides -56VDC at 0.4 amperes charging current (i.e. when AC
power is present) which allows for float charging from OfficeServ 7400 to emergency
backup batteries. The OfficeServ 7400 can also run without AC power on a -48VDC
battery system or rectifier. There should be no more than a 0.5VDC drop in voltage
from the OfficeServ 7400 and the batteries. Ensure polarity prior to connecting the
external -48VDC power source to the system.
The OfficeServ 7400 power supplies contain a monitoring circuit to switch the system
to customer provided 48VDC batteries when AC power in interrupted. Calls in progress
are not disconnected. The power supply circuitry monitors and recharges batteries as
needed.
Connect four 12V batteries or eight 6V batteries in series. Any NICAD or lead acid (car
or motorcycle type) battery can be used if its rating is not less than 6AH (amp hours)
but no more than 40AH per power supply. The batteries must be located within three
feet of the KSU. Use the factory-supplied wire harness with 36" white and black leads
to connect batteries. (see Figures 4.1 and 4.2).
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4.1
Table of Contents
INSTALLATION
PART 4 JUNE 2006