7885-2 & 7885-3
14
Standalone Power Supply Unit 120 V dc to -24 V dc
4.
Connect the terminated end of the output power cable to the mating
connector on the right side of the Standalone Power Supply Unit (7885-2).
5.
Ensure that there are no excess wires dangling into the isolation gap
between the Station and CO side circuits. Then close and secure the shelf
cover with the captive screws.
6.
Route the standard AC cable and plug it to a 120 V ac outlet.
7.
Verify the installation by making sure that you obtain 48 V dc in the shelf.
8.
Test the battery backup after 24 hours of continuous operation of the power
Supply Unit from the AC source.
?
Disconnect the AC source from the power supply while it is under load
from one or more 48 V dc isolator cards. Wait 10 minutes, then measure the
voltage at the “BATTERY TEST” terminals. If the voltage is lower than 46
V, the batteries are defective and must be replaced. When the red BATT
LED is on, the battery voltage is insufficient to power a shelf.
