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The Liquid Ignition Unit (LIU)
- Fabrication Responsibility:
- M.Peacock
Lou McFadin, W5DID
- Size:
- 195x200
- Average Power Dissipation:
- 1 Watt (when on)
Abstract
The Liquid Ignition Unit (LIU), the electronics module that supports the
motor ignition and burn sequence is also mounted in Equipment Bay 1.
This unit, responding to commands from the Integrated Housekeeping Unit
(IHU), initiates the firing sequence by opening
and pulsing the Helium isolation valves, control pressure in the
propellant tanks, and open the motor valves. The sequence requires
validation of coded firing commands, clocking, the commanded motor burn
time and safeing the system at the end of burn. Experience with
OSCAR 13
has demonstrated the full capability of the 400
N system to support the multiple burns necessary to place the Phase
3D spacecraft in its final orbit.
Last updated: May 3, 1996
by Ralf Zimmermann, DL1FDT