ROCKET LAB PSC MOTORIZED Lightband MKII, Руководство по эксплуатации

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Copyright PSC 2000781K MkII MLB Operating Procedure Page 36 of 68
9.
Setting-For-Flight the Lightband
This section will Set-For-Flight (SFF) the Lightband. During the SFF
operation the Lightband’s internal switches
experience two collective switch states. Prior to Setting-For-Flight, two test circuits will be operated to verify
proper power and data acquisition. Emulating each switch state reduces the probability of an anomaly. In order,
the states are
1. Stowed (full voltage and current draw for entire duration)
2. Intermediate (no voltage or current draw as this state emulates the stow switches cut power)
9.1 SFF Test Circuit #1 (Stowed State)
Step Procedure
Date & Initials
Tech. QA
9.1.1
Oscilloscope shall record voltage and current per the following requirements:
1.
Sample rate: ≥ 1,000 Hz
2.
Voltage resolution: ≤ 0.2 V
3.
Current resolution: ≤ 0.02 A
-----N/A-----
9.1.2
Set up the SFF Power and Measurement Circuit portion of SFF Test Circuit #1
per Figure 9-1.
Caution: If oscilloscope channels share common ground be cognizant of their
effect on the circuit (see section 16). Also, do not connect the negative voltage
probe to ground as this will bypass the Lightband’s limit switches and allow it to
Deploy.
9.1.3
May skip this step if no components/wiring were added since Stowing.
Excessively long harnesses and/or thin wires have significant resistance which
will reduce the voltage at the motors. Verify the resistance between the power
source and Lightband connector is acceptable. This applies to the complete
loop (power and return). PSC recommends the following method
1. Ensure power source output is off.
2. Set the timer relay function to
‘D: One Shot’
and 5 s duration.
3. Set a DMM to measure resistance and connect it across the power
source.
4. Jumper pin 1 to pin 9 on a DB-9 socket connector and connect to the
SFF Power and Measurement Circuit .
5. Activate the timer relay and read the DMM resistance measurement. It
shall be < 1.0
Ω. This verifies the Motor A portion of the circuit.
6. Remove the pin 1 to pin 9 jumper and connect pin 5 to pin 9.
7. Activate the timer relay and read the DMM resistance measurement. It
shall be < 1.0
Ω. This verifies the Motor B portion of the circuit.
8. Remove the jumper connector and DMM.
9.1.4
Set up the Test Circuit: Stowed portion of SFF Test Circuit #1 per Figure 9-1
and connect to the SFF Power and Measurement Circuit .