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1145B2 power supply
Issue 3 January 2008 111
● Power down the power unit (see label on power unit on how to do this) and refer servicing
under the following conditions:
● If liquid has been spilled into any of the products
● If any of the products have been exposed to water
● If any of the products do not operate normally
● If any of the products have been dropped or damaged
● If any of the products exhibits a change in performance
● Do not attempt to recharge batteries on your own. The batteries may leak corrosive
electrolyte or explode. The 1145B2 power unit recharges the batteries safely.
● Remove the batteries if the power unit will not be used for a long period of time (several
months or more) since during this time the battery may leak.
● Discard discharged batteries as soon as possible. Discharged batteries are more likely to
leak.
● Do not store batteries in high temperature areas. Batteries stored in a cold environment
should be protected from condensation during storage and warming. Batteries should be
stabilized at room temperature prior to use after cold storage. Do not install batteries if the
manufacturing date on the label indicates that the batteries are more than six months old.
Mounting the 1145B2/1146B2 power supply
Figure 52: 1145B2/1146B2 mounting arrangement on page 112 shows how the standard power
supply and wall-mounting plates fit together. Figure 53: Expanded power distribution unit
on
page 113 shows the expanded power supply components (power distribution unit and “T”
cable).
A manual switch on the distribution unit allows the user to redirect reserve power to outputs 1
through 32 so all outputs are provided battery reserve power or to outputs 1 through 8 to
provide high power above 6.25 watts.
Note:
Note: The switch must be set to the 1-32 position.
The 1145B22/1146B2 is a -48 V power supply with 275 watts total output. Each output circuit is
current limited by a Polymer Positive Temperature Coefficient Resistance Device (PTC) that
limits the maximum output to 12 watts. Each 1146B2 output has an LED to indicate the status of
the PTC. If the LED is on, the PTC has a short on that power pair.
Not all outputs can simultaneously provide 12 watts. The average power per output cannot
exceed 8.6 watts (275/32 = 8.6). The 1145B22 is designed to power one ISDN terminal or DCP
adjunct per output. The maximum number of terminals or adjuncts is 32 at less than or equal to
6.25 watts each. The 1145B22 is required for installations outside the United States.
Auxiliary power (local or bulk) is always required for the following:
● Attendant Console 302D
● PassageWay adapter interface