Lucent Technologies Lineage
®
2000 ECS-12U Controller J85501E-2
5 - 10 Acceptance Testing Issue 3 July 1998
• The LVD contactor closes.
• The LVD OPEN LED on the front of the CP5 card
retires.
• The MNF LED of the ECS-12U retires.
• Alarm contacts TB102/10-11 on CP1 of the ECS-12U
open.
3. Check the locations of the jumpers P505.1 and P505.2 on
the rear of the CP5 LVD/Fuse Board. For 48V plants,
place both jumpers across pins 1 and 2 for a threshold of
42.5 ±0.5V, or across pins 2 and 3 for a threshold of 40.5
±0.5V. For 24V plants, place both jumpers across pins 1
and 2 for a threshold of 21.25 ±0.25V, or across pins 2 and
3 for a threshold of 20.25 ±0.25V. Slowly lower the power
supply voltage toward the selected threshold.
NOTE As the power supply’s voltage decreases and approaches the
disconnect threshold, the yellow LVD FAIL LED may light.
This is normal, and indicates that one part of the LVD circuit
has reached its threshold before the other redundant circuit.
If the yellow LVD FAIL LED lights within the disconnect
tolerance and then the contactor opens, also within the
tolerance, the low voltage battery disconnect circuit is
functioning normally.
4. Note the disconnect voltage at which the contactor opens;
observe the external conditions listed in Step 1 of this
procedure.
5. Raise the power supply voltage above the LVD threshold
identified in Step 3. When the contactor operates again,
observe the external conditions listed in Step 2.
6. Turn off and disconnect the power supply and voltmeter.
The LVD will open once again. Reconnect LV- (or LV+)
to its position on the battery bus. Verify that the contactor
closes once again and that all alarm indications retire.
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