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Technical Manual
FT420
– Iss 2.4
54
3.12 Power Supply Management
3.12.1 Maximum Current Capacity
The CIE maximum current capacity is 5A. This includes the total current supplied to the main control
board, battery charger, main display board, expansion control boards and the expansion display
boards.
WARNING: The maximum CIE current capacity shall not be exceeded in any applications.
Otherwise the fuses on the control board may blow and damage the CIE hardware.
3.12.2 Mains power supply
The CIE mains power supply requirements are shown in Table 34. The maximum supply current
excludes the current drawn by the MDH and the audio amplifier if used.
Table 34 Mains Power Supply Requirement
Characteristics
Typical
Tolerance
Input Voltage Range
240V
AC
+/- 1%
Input Voltage Frequency
50Hz
47- 63 Hz
Output Voltage
28V
DC
+/- 1%
AC Input Current
<= 1A
Varies based on the applications
DC Output Current
<= 5A
Varies based on the applications
The output voltage of the AC/DC power supply needs to be checked and calibrated. An on-site
calibration may be necessary to compensate the load variations. The calibration procedure is as
follows.
•
Use a calibrated and certified multimeter to measure the voltage of the battery terminals.
•
At the same time, adjust the AC/DC power supply potentiometer until the multimeter reading
stabilises between 27.3
– 27.5V
DC
on the battery terminals (without connecting the batteries).
WARNING: Care must be taken when adjusting the AC/DC power supply. Do not to touch the
covered 240V
AC
wirings and terminals. Do not remove the plastic protection cover unless
necessary.
3.12.3 Power supply monitoring
The CIE constantly monitors the mains power supply and the battery charger voltage. The CIE power
supply monitoring characteristics are listed below.
Table 35 Power Supply Monitoring Characteristics
Characteristics
Threshold
Battery Low Fault
24V
DC
, Measured on the battery terminals
Battery Automatic Cut Off
20.7V
DC
, Measured on the battery terminals, when the mains is not available
Charger High Fault
30.5V
DC
, Measured on the main terminals
Main Low Fault
22.1V
DC
, Measured on the main terminals
Charger Low Fault
24.3V
DC
, Measured on the battery terminals
Automatic Battery Test
Periodically run the system on battery only for one hour every 70 hours. Terminate
automatically when any power supply fault or an alarm condition being detected.
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