ENIGMA XM88422 Digital Receiver
Version 1.50
31
6. Power Module
The Power Module supplies power to the other
modules in the system, charges and supervises the
backup battery and reports AC and battery status to
the CPM Unit.
Inputs and Outputs
The input of the Power Module is 16.5 VAC. The
module contains a dual power supply, separate
power supplies for the modules and for battery
charging. The red AC Power light on the front of the
Power Module indicates the presence of the AC
voltage.
For the other modules in the system the Power
Module makes 13.2 V DC stabilized power with a
maximum static load of 3 Amps. This voltage is
spread for the modules on the power bus. The other
voltages (stabilized 5V DC, 110 VAC for the
backlights) are created inside the modules to
minimize static and electric noise sensitivity and EM
radiation.
For battery charging the Power Module makes 13.8 V
DC stabilized power. The maximum battery charging
current is 1.5 Amps.
Battery Status
The Battery light on the front of the Power Module
indicates the status of the battery. The battery status
can be the following
Steady green light
Indicates that the battery is present and the battery
capacity is in order. The Power Module reports
“Battery OK”
Flashing green light
Indicates that the battery is present, however the
battery capacity is below the required minimum. The
Power Module reports “Battery Low”. This can occur,
if a discharged battery is connected, or the nominal
capacity of the battery is below 6 Ah. If the battery is
discharged, leave the battery connected and the
Power Module will charge it up. After reaching the
required capacity, the light will go steady green and
the Power Module will report “Battery OK”. If the
battery will not reach the required capacity even after
a long time (1 day) replace the battery to ensure
reliable battery backup operation in case of AC
failure.
Flashing red light
If the Battery LED flashes red, that means that either
no battery is connected, or the battery connection is
broken or the battery is deeply discharged. In this
case, always check battery connections and replace
the battery, because the receivers battery backup
operation will not be reliable under such conditions.
Battery Testing
The Power Module checks for battery presence every
minute, and conducts an active battery test in every
hour. It also makes the active test after the battery is
connected to the receiver.
When checking for battery presence, the Power
Module checks the voltage on the battery terminals
with decreasing the charging voltage applied. If the
voltage is below a preprogrammed limit, it will cause
a battery fail event.
The active test is conducted only when a battery is
connected to the receiver. During the active test the
Power Module first disconnects charging voltage
entirely. If the voltage of the battery does not drop, it
applies a load to the battery and observes the
gradient of the voltage drop. If the voltage of the
battery sinks too fast, or falls below a limit, the Power
Module will cause a battery fault event.
IMPORTANT:
The battery will be considered OK only
if it passes the active test. Therefore small capacity
batteries will never be found good. The minimum
recommended battery capacity for the ENIGMA
receiver is 7 Ah.
Содержание XM88422
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