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|  MIL-N-81497A(AS)
Transfer Criteria - Transfer to battery power
3.5.6.5.2
shall be accomplished when input power is interrupted or during the
abnormal transient limits as defined in MIL-STD-704 which would cause
the output DC supplies to exceed the limits specified.
Battery Charging Requirements -
3.5.6.5.3
(1) During normal equipment useage the battery
shall be under trickle charge from the
Power Supply. Trickle charge levels shall
be nominally 80 milliamperes (MA). Charge
current levels shall be automatically con-
trolled as a function of ambient temperature.
Initial battery charging requirements shall
(2)
be as follows:
Duration
Current (maximum)
15 MIN
500 MA
250 MA
30 MIN
Battery recharging shall be accomplished
(3)
prior to utilization after the following
storage periods.
Storage Period
Storage Temperature
90 days
25 DEG C
30 days
50 DEG C
Cable Monitor - The Power Supply shall provide a
3.5.6.6
cable monitor circuit such that system operation is inhibited unless
all system interconnection cables provided within the aircraft are
properly connected to the INS.
Power ON - Power Supply operation shall require
3.5.6.7
the presence of both a +28 VDC start signal from the Control, Navi-
gation and an external power on DC ground signal.
3.5.6.8
Power OFF - Upon the removal of the external Power
ON ground potential signal, defined as the Power OFF condition, the
Power Supply shall issue a shutdown discrete to the Computer, Navi-
gation and switch to internal battery power. After 200 SEC of
battery operation the Power Supply shall automatically shutdown.
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