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3-18
Clamp voltage transients at 300V within 5 nsec. when exposed to wave-forms as
described in the ANSI/IEEE Standard C62.41-1980 (IEEE 587).
Reduce RFI/EMI noise by at least 20 dB at frequencies between 5 kHz and 30 MHz.
3. Battery Backup - System
External batteries may be connected to the KSU via the optional Starplus VC61101
Battery Charging Unit (BCU). This unit may be equipped with batteries sized to meet the
particular customer requirements. The approximate time, in back-up hours, is located in
Table 2-11. In the event of a commercial power outage, the BCU will provide the
necessary system voltage (24V) to allow full feature key telephone operation until AC
power is restored or the battery voltage reaches minimum voltage thresholds and is
automatically disconnected to avoid battery damage. This threshold is approximately 21
to 21.5V. The amount of system battery operation time is dependent on several factors:
Number and type of key telephones installed
System traffic load
Age of external batteries
Equipment Room Temperature
Amp/Hour rating of external batteries
Recovery time since last AC power interruption
The Starplus VC61106 BCU is designed for use with the DHS system. Follow the
instructions supplied with the BCU to install batteries in that unit. Consult Table 2-11 for
system operating current draw to select the right battery size for the desired back up
duration.
Configuration
3 x 8
6 x 16
9 x 24
Cautionary Steps
To reduce the risk of fire or injury to persons, read and follow these tips:
Use only the following type and size battery(ies) listed here as the maximum battery
type and size: 24vdc, 40 AH.
Do not dispose of any battery(ies) in a fire, the cell may explode. Check with local
codes for possible special disposal instructions.
Do not open or mutilate the battery(ies). Released electrolyte is corrosive and may
cause damage to the eyes or skin. It may be toxic if swallowed.
Exercise care in handling batteries in order not to short the battery with conducting
materials such as rings, bracelets, and keys. The battery or conductor may overheat
and cause burns.
Table 3-11: Battery Sizing Chart
Battery Power (Hr)
12 AH
3.5
2
1.5
20 AH
40 AH
4.5
3.5
2.5
DHS-E Installation
8
7
4
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