7200 TROUBLESHOOTING
E - 9
Bus error “card name and number” (Applies to: All systems)
Description: This fault occurs when a card inside the VME card cage fails to
respond when addressed by the CPU. It means the CPU is not
able to communicate with the card that displays the bus error.
To Correct: Locate the card in the VME card cage and ensure that it is
correctly and completely plugged into the card cage.
Encoder Error (Applies to: AZ or EL)
Description: This fault occurs when the CPU is no longer receiving position data
from the encoder/resolver.
To Correct: Check to see that the wiring to the position encoder has not
become disconnected. For AZ/EL optical encoders ensure that the
encoder DC power supply has not failed. It should be 5VDC at the
junction box to the encoder.
Immobile (Applies to: AZ, EL, and POL)
Description: This fault occurs when an axis is commanded to move and it does
not move the user-specified distance within a user specified time
period (par - Immobile/reversed timeout [ms]).
To Correct: Review the following possible causes and take corrective action as
needed:
1) Increase Immobile/reversed timeout [ms] parameter.
2) Reduce the Immobile/Reversed tolerance [deg] parameter.
3) and/or increase the Immobile/Reversed timeout [ms] parameter.
The user can also disable the axis immobile errors.
Intelsat data expired (Applies to: All systems tracking Intelsat targets)
Description: This fault occurs when the Intelsat data set in the ACU is no longer
valid. Standard data sets are valid for 170 hours.
To Correct: Check to ensure that the UTC time shown on the ACU is correct.
Obtain a current data set and enter it into the ACU.
Intelsat data invalid--cannot track (Applies to: All systems tracking Intelsat targets)
Description: This fault occurs if the Intelsat data set is entered incorrectly.
To Correct: Reenter the set being careful to check that the set entered exactly
matches the set given.
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