2
GENERAL APPLICATION NOTES AND WARNINGS
WARNING
:
There are no user serviceable parts inside. Service must be referred to a qualified factory technician or factory
trained technician. DO NOT
OPERATE THE UNIT IN A HOT, ENCLOSED ENVIRONMENT OR COMPARTMENT. BE SURE
ADEQUATE VENTILATION FOR COOLING IS PROVIDED SINCE HEAT BUILD UP WILL SHORTEN COMPONENT LIFE.
NOTE
: The individual user should take care to determine prior to use or installation whether this device is suitable, adequate, and safe
for the use intended. Since individual applications are subject to numerous variations, DuraComm makes no representation or warranty
as to the merchantability, suitability, or fitness of these units for any specific application.
NOTE
: DuraComm’s precision regulated power supplies operate internally from voltages in excess of 300 volts. In rare cases, voltage
spikes or transients on the AC power line, or overheating, may cause a component failure in the power supply. Over load of the output
will cause the circuit breaker of the power supply circuitry to operate. In either case, the cause must be determined and corrected.
Failures require investigation as to the cause and/or repair of the unit.
NOTE
: Most audio and radio equipment draws much less average current than the peak demand. If the unit stops working, check the
12 volt connections for tightness
.
CHARGING
A special charging circuit is used in the power supply which keeps the battery at peak charge levels without danger of overcharging. If
the AC power is interrupted, the internal battery automatically takes over and provides seamless transfer of DC power to the load.
If the battery becomes depleted, the charging circuit will recharge the battery once AC power is restored.
Let battery charge for 24 hours prior to installing to ensure the battery is fully charged.(Power switch needs to be ON)
BATTERY LIFE
The length of time the battery will provide power depends on the current draw (demand) of the load.
Typically, based on a
90/5/5 duty cycle (90% standby /5% RX/ 5% TX), a radio drawing 0.25 amps on standby; .75 amps on RX; and 10 amps on TX will
demand an average of .7625 amp/hours. Assuming the battery is fully charged and allowing for a de-rating factor of 20%, the
approximate time can be calculated as follows.[7 amp/hours (battery) divided .7625 amp/hrs (demand) = 9.18 hours.] Applying the de-
rate factor (9.18 hours x .80) results in
an approximate
“real world” operating life of about 7.3 hours.
OPERATION
Connect your 12 volt DC device (Two-way radio, repeater etc.) to the red (positive) and black (negative) binding posts on the rear of the
power supply
. BE SURE
you connect positive (red) to positive and negative (black) to negative of the DC equipment being powered.
Insert the AC plug into 90-264 VAC with Euro type “C” plug outlet. Press the ON/OFF switch on the front of the panel to the “on”
position. L.E.D. indicates – DC Output Power
