Gaia
GAIA.ASU.SP.ESM.00007
Issue 2.00
Page 19 of 79
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GAIA.ASU.SP.ESM.00007 (Avionics SCOE Req Iss 2).doc
AVI-4021/CREATED/T,R
For both Type 1 and Type 2 Power Simulation, the LCL outputs shall be fed from a common Power
Source (or multiple sources feeding LCL groups).
Note: The common Power Source is equivalent to the PCDU Main Bus regulation point.
AVI-4022/CREATED/T
The common Power Source (or sources) shall meet the following specification:
Reqt
-1 Output Voltage 28.0V ± 0.14V (±0.5%)
-2 Current Limit +10% As defined in Table 3.6-1 for all or groups
of LCL
-3 Over Voltage Protection Level 34.0V ±50mV
-4 Over Current Protection Level +200mA ±50mA of overall Current Limit
-5 Protection Response Time >5ms < 15ms (from protection occurrence)
-6 Output Ripple <100mV
AVI-4054/CREATED/T
The output impedance of any single (simulated) LCL output shall be < 20m
Ω
, including the
contribution of the cable connecting to the Spacecraft harness.
AVI-4055/CREATED/A,R
For Type 1 and Type 2 simulations, the Voltage Regulation point shall be the common Power Source.
AVI-2583/CREATED/T
In open-loop test modes, it shall be possible to switch ON/OFF LCL outputs by any of the following
methods:
• in response to commands received by the PCDU Remote Terminal of the 1553 BUS, as
defined in Section 3.6.2.2.
• by detection of the relevant SHP command , as defined in Section 3.6.9.
• by command from the local MMI.
• remotely from the CCS (Test Procedure).
AVI-4097/CREATED/T
Switch ON or OFF of LCL circuits by response to PCDU RT 1553 BUS commands and by SHP shall
both be possible, depending on Gaia command distribution requirements.
AVI-4098/CREATED/T
Switch ON or OFF of LCL circuits by local MMI and remote CCS shall be available to override
Spacecraft commanding for failure injection.
AVI-2584/CREATED/T
In closed-loop test mode, ON/OFF switching of the LCL circuits shall be achieved under the control of
the RTS, in response to MIL-STD-1553B BUS or SHP commands received by the PCDU Model.
AVI-3439/CREATED/T
The protection status of each LCL output shall be made available to the operator (local MMI).
Specifically, an error shall be raised if any protection circuit is triggered.
AVI-2750/CREATED/T
It shall be possible to switch off all LCL output by single command from the local MMI or remotely
from the CCS (Test Procedure).
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