Positron 7885-2, Описание и установка

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Standalone Power Supply Unit 120 V dc to -24 V dc 3
7885-2 & 7885-3
The features of the unit (comprised of the power supply and battery units)
include the following:
• The unit may be used with both the old and new generation Three, Five or
Eight-card Teleline Shelf.
• The unit provides floating 48 V dc at up to 1.3 A from a standard 120 V ac
source. When wiring to a shelf, the supply output may be left floating or
referenced to station ground.
• The unit uses standard full wave rectification, filtering, and voltage
regulation to perform the AC to DC conversion.
• When model 7885-2 and 7885-3 are connected together, they provide 5.7
ampere-hours of charge at 48 V dc. The batteries are kept charged by the
power supply while it is operating from the AC source.
• A fuse provides overcurrent protection at the input, while a second at the
output provides short circuit protection.
• A green “Power ON” LED located on the front panel indicates the presence
of 48 V dc output.
• A red “CHARGE” LED located on the front panel indicates that the batteries
are undercharged.
• A pair of battery test jacks permit an easy assessment of batteries status.