ADC PowerWorx Power Distribution - Manual (Page 34)

ADCP-80-575 • Issue 2 • December 2006
Page 28
© 2006, ADC Telecommunications, Inc.
To test the KLM fuse alarm indicator, use the following procedure:
1. With the fuse platform powered and no KLM fuses installed, verify that no fuse alarm
LEDs are lit (no red or green light). Verify that the fuse alarm relay indicates an open
circuit between the NO contact and the C contact at the fuse alarm contacts.
2. Insert a known good KLM fuse in each position to be used, one at a time, and verify that
the corresponding fuse alarm LED turns green. Verify that the fuse alarm relay indicates
an open circuit between the NO contact and the C contact at the fuse alarm contacts.
3. Remove the KLM fuse in each position, one at a time, and verify that the corresponding
fuse alarm LED turns red. Verify that the fuse alarm relay indicates a short circuit between
the NO contact and the C contact at the fuse alarm contacts.
4. Insert a known good KLM fuse in each position, one at a time, and verify that the
corresponding fuse alarm LED turns green. After approximately ten seconds, the LED will
begin to flash. Remove the KLM fuse and verify that the corresponding fuse alarm is not
lit (no red or green light). Once all the fuse alarm LEDs are not lit, verify that the fuse
alarm relay indicates an open circuit between the NO contact and the C contact at the fuse
alarm contacts.
To install a KLM fuse, insert the fuse in the selected position, as in the procedure above. Verify
that the visual fuse alarm LED for that fuse is green.
6 OPERATION
All fuse platform circuits are operational as soon as power is applied to the input connectors.
The alarm indicator should not light when power is applied.
Operation of the fuse platform consists of removing and replacing fuses when a fuse fails. If a
fuse fails, the alarm indicator lights, and the external and remote alarms are activated (if
present).
6.1 Clearing a KLM Fuse Alarm
If the operator wants to clear an alarm in a KLM fuse position without leaving a new fuse
installed, the following steps are required:
1. Using a good KLM fuse borrowed from another location, replace the failed fuse with the
good fuse, causing the LED to turn green and the alarm to be cleared.
Note: There is less than 1 volt present at a non-active KLM fuse position.
Caution: This equipment employs electrical voltage and amperage levels which may be
considered an electrical hazard. Care should be exercised to assure that only qualified
personnel are allowed to install, operate, maintain, or otherwise come in contact with this
equipment when the fuse platform is energized. Only insulated tools should be used on
energized elements of the fuse platform.