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All modules output voltages are easily adjustable in ±12% range.
Voltage Stability Static variation
For the 5V outputs - 0.1V max.
For the -5V outputs - 0.05V max
For the ±15V outputs - 0.1V max.
Dynamic variation:
In case of a change in load from 30% to 90% of maximum load, and back, the maximum voltage drop is 5% over maximum time period of 50usec.
Continuous overload with no damage
110% of nominal for 10 minutes over all
environmental conditions.
Minimum efficiency
80% over all temperature and maximum load
Extended Temperature
available from
-40°C
to + 71°C
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Size & weight
APS unit dimensions are:
Length: 22.02 inch including gripping handles.
Width: 15.47 inch.
Height: 7.80 inch
Weight is 27 Kg |
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Maximum overshoot:
105% of nominal, for 50ms max.
over voltage protection
Each module has an over voltage protection in it’s output, activated by voltages as shown in table:
Over current/short circuit protection
The APS is not damaged by over load or short circuit conditions in any of its outputs for indefinite period of time as required in MIL STD 454 req. #8 for class 1 equipment.
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Ripple & Spikes
The Ripple & Spikes amplitudes originated from the switching frequency or it’s harmonics do not extend the values shown in the table:
The ripple values are measured in adjacent to the power supply output connectors, with a 1uF ceramic capacitor connected in parallel to the inspection points. The inspection bandwidth is 20MHZ.
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The minimal current, which triggers the protection when overload occurs, is 110% of Max. current.
In the event of over-load the power supply makes periodical attempts to recover, and to return to normal operation within 0.5 Sec. after the removal of the over-load.
Monitoring
and Recording
During
Flight voltage, current and temperature of each power supply
of the APS are measured and reported via a serial port (RS-232) to
an external connector on the panel. The measurement is compared to a
fixed threshold. An Event is defined when a measurement passes
pre-defined limits and disappears when the measurement is within
limits. The refresh rate of the measurement is ~ 1-2 sec. The
setting of the thresholds is defined by the End User. Events that
are above or below the the normal thresholds are stored in the
non-volatile memory with the following parameters:
-
Elapsed time from POWER ON.
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The Power Supply module for which
the event occurred
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Type of measurement and it value
– voltage, current or temperature.
The raw data values stored in the Flash can be milked after
the flight and displayed on Notebook with their true physical
values.
Environmental
Temperature range:
Operating -40°C - 71°C;
Non-operating: -40°C - +90°C;
Relative humidity:
The APS shall operate when exposed to a relative humidity of 95% in temperature of 55° C with condensation according to
MIL-E-5400T.
Fungus
The APS shall operate when exposed to fungus growth according to MIL-E-5400T.
Salt fog
The APS
shall operate when exposed to Salt fog according to
MIL-E-5400T.
Reliability
The MTBF shall be 20000 operating hrs.
EMI/RFI
MIL-STD-461C Categories CE03, RE02, RS03, CS02
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Thermal protection
In the event of over-temperature the APS shuts down, without causing any damage to its components.
The Power Supply Overtemp protection will not trigger when the power supply will operate at full load over the full ambient operation range (-20°C - 71°C)
When triggered , the Overtemp protection will automatically reset when the failure that has caused the Overtemp has been removed.
Vibration
The APS shall operate as specified after being subjected to operational vibration according to MIL-STD-810F for cargo panes per MIL-STD-810F.
Shock
The APS
shall operate as
specified after being subjected to operational shock as encountered on board
cargo planes
per MIL-STD-810F.
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