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Page Title:
Power from DRU to peripheral equipment. |
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|  MIL-D-70789A (AR)
multiple fault conditions. Loss of power shall not damage the
DRU or affect the computer program or DRU calibration data.
Special alignment procedures shall not be required after an
unexpected power loss. Electrical overload protection shall be
provided as specified in Requirement 8 of MIL-STD-454. Bonding
of the DRU to the vehicle shall be in accordance with Class H of
MIL-B-5087.
The power required for the DRU shall not exceed 150 watts
including regulated power furnished to external devices
(3.5.4.2.2.1), but not unregulated power (3.5.4.2.2.2).
Pin assignments for DRU power connector J2 shall be in accordance
with Figure 5.
3.5.4.2.1
Power control. The method of power control shall
be selected by means of a shorting jumper between pins C and D of
J2. If no jumper is present, the DRU shall be activated upon
application of system power and shall automatically initiate the
startup and alignment sequence. With this type of power control
the DRU shall deactivate when the primary power is outside the
acceptable range (3.5.4.2); the receipt of a SHUTDOWN or STORED
HEADING SHUTDOWN command shall only initiate storage of data.
With this method of power control and after deactivation of the
DRU has started, the DRU shall reset to the beginning of the
startup and initialization sequence (3.5.3.1.1) when acceptable
primary power is next applied. If a jumper is present between
pins C and D of J2, the DRU shall be activated only by a
momentary contact closure between pins 12 and 13 of J1 (Table
II), and deactivated after receipt of a SHUTDOWN or STORED
HEADING SHUTDOWN command or when the primary power is outside the
acceptable range (3.5.4.2). The voltage appearing on J1 pins 12
and 13 shall not exceed the input power voltage. The current
flowing through J1 pins 12 and 13 shall not exceed 5.0
milliamperes.
The DRU shall be able to reactivate within 5 seconds after power
has been removed.
3.5.4.2.2
Power from DRU to peripheral equipment.
3.5.4.2.2.1 Requlated. The DC voltage and current
requirements listed below shall be supplied by the DRU for
external use, when the DRU is activated (3.5.4.2.1).
Maximum Ripple
Current
Voltaqe
150 mV pk-pk
350 mA
+15 VDC
150 mV pk-pk
350 mA
-15 VDC
100 mV pk-pk
700 mA
+5 VDC
26
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