ALARM-24 Series User Manual P/N 821542 Rev-A
9
© 2003 Wohler Technologies Inc. ALL rights reserved
Installation
Section 2: Operation
Mounting
The unit should be mounted where convenient for operating persons, ideally at approximately eye level for best visual monitoring.
Heat Dissipation
No special considerations for cooling are necessary as long as the ambient temperature inside the rack area does not exceed
approximately 40°C (104°F).
Mechanical Bracing
The chassis is securely attached to the front panel at five points along its surface, not just at the four corners of the chassis ears.
This feature will reduce or eliminate rear bracing requirements in many mobile/portable applications. The weight of internal
components is distributed fairly evenly around the unit.
Audio Connections
Connection of the audio feeds is straightforward. Please refer to the system interconnect block diagram on pages 22 and 23 for
clarification of the general signal paths into the
ALARM-24
series units.
Care should be exercised to avoid mis-matched cable types and other similar causes of undesired reflections in RF signal systems.
Electrical Interference
As with any audio equipment, maximum immunity from electrical interference requires the use of shielded cable; however,
satisfactory results can sometimes be obtained without it. The internal circuitry common is connected to the chassis.
AC Power
The unit's AC mains connection is via a standard IEC inlet, with safety ground connected directly to the unit's chassis. The
universal AC input (100-240VAC, 50/60Hz) switching power supply is a self-resetting sealed type, with automatic over-voltage
and over-current shutdown. There is no user-replaceable fuse in either the primary or secondary circuit.
Alarm Sounder Enable/Disable Instructions
All
ALARM-24
Series units feature a Piezo
Alarm Sounder
located on the front panel (
Item 1
, page 10). This sounder produces an
audible alarm when the configured alarm threshold has been exceeded. This sounder may be disabled or enabled using the instructions
below.
To
ENABLE
the acoustic sounder in the unit, perform the following steps on the front panel:
1)
Hold down the
Reset All
button (
Item 7
, page 10)
2)
Press and
release
the
Channel 3 Reset Alarm
button (
Item 3
, page 10)
3)
Release the
Reset All
button
To
DISABLE
the acoustic sounder in the unit, perform the following steps on the front panel:
1)
Hold down the
Reset All
button (
Item 7
, page 10)
2)
Press and
release
the
Channel 1 Reset Alarm
button (
Item 3
, page 10)
3)
Release the
Reset All
button