Clear-Com Communication Systems
Encore System Installation Instruction Manual
1-3
Clear-Com’s fail-safe design automatically shuts down the power to a
channel when a short circuit or electronic overload is sensed on that
channel. The other channel will continue to operate normally. Once the
fault condition is removed, the MS-702’s fail-safe circuit will restore
power, even under full load conditions. LED indicators signal a short or
overload on either channel.
The DC power output details are:
• 1.2A continuous output
• 2A peak output (not exceeding the 1.2A rating for more than 2
seconds per 1 minute period)
The station internal power supply senses the difference between
short-term and long-term shorts and overload conditions. After the first
few times a short or overload occurs, the power supply will try to
restore power after only 0.5 seconds. If the short or overload persists
or occurs repeatedly, the power supply will take progressively longer
(to a maximum of 20 seconds) to try to restore power. This protects the
power supply from damage due to overheating. Once the short is
removed, the channel will recover, even under a full load condition.
The automatic power restore times are shown in the following chart:
Figure 1-2: Automatic Power Restore Times
Shorts are generally caused by miswiring or damaged cables.
Overloads are generally caused by connecting too many beltpacks
and stations to a channel.
INSTALLING AN INTERCOM SYSTEM
When considering how to install and wire an intercom system, several
factors must be taken into account. These include the number of
stations, the length of the cable runs and whether single or multiple
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Number of
seconds to
restore
Number of recent shorts or overloads
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