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|  MIL-N-81604C(AS)
Para 3.5.3.2
(cont)
b.
Battery Heater - Single phase, 140-watts, resistive
load whose duration is dependent upon the temperature
of battery.
3.5.3.3 Output Power - The PSU shall furnish d-c output power for
*
*
use by the CAINS equipment as shown in table XIX. Individual
circuit breakers shall be provided for overload protection of
*
each of +32 volt d-c line. Dynamic regulation of the +28 volt d-c
supply shall be 5 percent for an incremental step load variation
of two amperes. Regulation of the +32 volts d-c shall be 6 volts
*
with input power to the PSU defined by MIL-STD-704 steady state
With input power defined by MIL-STD-704 transient
conditions.
*
conditions, +32 volt d-c overvoltage shall vary as the input
power varies, while the undervoltage shall be governed by the
PSU battery voltage. This undervoltage is subject to battery
*
charge conditions but shall be limited to a minimum of 16.5 volts
d-c at which point the PSU will turn off, indicating a no-go.
*
*
Ripple on the regulated outputs shall not exceed 300 millivolts
*
peak-to-peak. Ripple on the +32 volts d-c shall not exceed
5 volts peak-to-peak. Over and under voltage detection on the 28
*
volt d-c supplies shall be provided. The maximum overvoltage
*
detection level shall be 39 volts d-c and the minimum under- .
*
voltage detection level shall be 21 volts d-c. Activation of
the overvoltage crowbar circuitry shall reduce the output voltage
*
to less than 2.5 volts d-c.
3.5.3.4 Battery Back-up Power - A fully charged battery in the
PSU shall maintain the specified steady state average power levels
for a period of up to 10 seconds in flight, and up to five seconds
on the ground, in the event of an aircraft power interruption.
The battery shall be capable of sustaining this power no later
than 9 minutes after equipment turn-on at 0F, no later than
17 minutes after equipment turn-on at -65F, and no later than
1 minute after equipment turn-on above +104F.
(NOTE: The bat-
tery is continuously in the loop if power transient occurs outside
the above conditions. However, duration of power transient pro-
tection during that period is unknown. )
To prevent accidental total discharge of the battery during any
one interrupt, a built-in timer shall prevent battery discharge
for time intervals greater than 5 2 seconds while on deck. The
MODE switch must be recycled in order to reset the timer and allow
additional power interruptions. If the power supply should shut
down prior to the timer shutdown point during a power interruption,
104
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