ROCKET LAB PSC MOTORIZED Lightband MKII, Руководство по эксплуатации

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Copyright PSC 2000781K MkII MLB Operating Procedure Page 42 of 68
Step Procedure
Date & Initials
Tech. QA
9.3.3
PSC recommends recording video and audio of the Set-For-Flight operation.
This is not required but has proven very helpful in determining root cause in the
unexpected event of an anomaly.
-----N/A-----
9.3.4
To Set-For-Flight the Lightband:
1. See Figure 9-4 and Table 9-1 for the anticipated current draw and power
duration.
2. Designate a person to watch the power source output display.
3. Turn on the power source output.
4. Verify the oscilloscope trigger is active and ready to acquire data.
5. Activate the timer relay. This will send power to the motors and Set-For-
Flight the Lightband. The drivetrain will free run for ~1.1 s and then the
Sliding Tube will move off the Stow limit switches. This will be apparent via
one or more of the following
a)
the current spikes
b) the Sliding Tube begins to rapidly move off and on the Motor Bracket
c) an audible chatter emanates from the Motor Bracket Assembly (the
chatter is the electro-mechanical natural frequency of the Motor
Bracket Assembly)
Manually cut power if the current limit is reached or the timer relay runs longer
than specified. Then contact PSC per section 4. A visual inspection of the
Lightband may be performed, but do not change configuration.
Caution: See note 1 below.
9.3.5
Take a picture of the oscilloscope screen in case data inadvertently gets
erased.
9.3.6
Turn off the power source output.
9.3.7
Save the voltage and current profiles for both motors and verify the data is
readable.
9.3.8
Figure 9-4 shows example Set-For-Flight voltage and current profiles.
Complete Table 9-1 to verify all parameters are within tolerance. Single data
point exceedances are acceptable. Also, a slow sample rate may alias data. Do
not filter data. Contact PSC if a discrepancy is found.
Remember to account for non-zero offsets in the voltage or current
measurements.
(1) If using an oscilloscope with common ground the negative voltage probes at pins 4 and 8 are connected. The
current flow can bypass one of the Stow limit switches. Therefore, both Stow limit switches must open before
power is cut. This will manifest itself in the current profile as both motors being perfectly synced, when in
reality there may be switch activation differences of a few milliseconds. See Section 16 for details.