ADC 70 - Manual (Page 30)

ADCP-80-524 • Issue 1 • November 2001
Page 30
©
2001, ADC Telecommunications, Inc.
5.5 Connection Polarity Test
To
verify that the input power wires are connected to the correct terminals, measure the voltage
between
the input return connector (RTN) and the chassis ground using a multi meter. The
voltage
should be less than 2.0 Vdc. If the voltage is more than 2.0 Vdc, reverse the input power
wires
and measure the voltage between the input return connector (RTN) and the chassis ground
again
to determine that the voltage is less than 2.0 Vdc.
5.6 Fuse Alarm Test
Place
a fuse that has failed in one of the fuse positions on each bus. The visual fuse alarm
indicators
(LED) for the bus will change from unlighted to a red light, and the fuse failure alarm
relay
will operate. Replace the failed fuses with known good fuses.
6 OPERATION
All
fuse panel 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 panel consists of removing and replacing fuses when they fail. If a fuse
fails,
the alarm LED indicator for the bus lights, and the external and remote alarms are
activated
(if present).
7 MAINTENANCE
7.1 Inspection
Inspect
the fuse panel periodically (every six months is recommended) for damage to the fuses,
damaged
or broken wires on the power outputs and the external alarm connections. Inspect for
excessive
dust and dirt that block the vents.
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 the fuse panel when
it
is energized. Only insulated tools should be used on energized elements of the panel.
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 the fuse panel when
it
is energized. Only insulated tools should be used on energized elements of the panel.