7200 Acu Error Messages; Axis Fault (Applies To: Az, El); Box Violation Limit (Applies To: Four Compass Directions); Brake Set (Applies To: Az, El - Systems With Brakes Only) - General Dynamics 7200 Operation And Maintenance Manual

7200 TROUBLESHOOTING
6.0

7200 ACU Error Messages

Axis Fault (Applies to: AZ, EL)

Description: This fault occurs when an axis fault device such as a motor
handcrank interlock or an elevation reflector hatch is activated.
Electrical power is removed from the faulted axis motor
controller(s). See "Motor # handcrank" also.
To Correct: Check axis interlocks to ensure that the have not been activated. If
they have not, check the wiring.

Box Violation Limit (Applies to: Four Compass Directions)

Description: This fault occurs when the antenna has reached the box limit
defined by the target nominal longitude and the target estimated
inclination.
To Correct: If the inclination of the target is greater than estimated then
increase the estimated inclination so it encompasses the lateral
movement of the target. Verify that the target nominal longitude is
correct.

Brake Set (Applies to: AZ, EL - Systems with Brakes Only)

Description: This fault occurs if the brakes have been commanded to be
released (brake coil energized) but the brake status switch
indicates that the brakes are still engaged.
To Correct: Check the brake(s) to ensure that they are releasing properly. If
they are then check the wiring to ensure proper status is being
received.
Brake Set While Tracking (Applies to: AZ, EL – Systems with Brakes Only)
Description: This fault occurs if the brakes become set (engaged) while the
ACU is still maintaining a command to release the brakes (i.e.
uncommanded setting of the brakes). This fault latches on the
ACU and can be cleared by exercising the Clear/Correct System
Fault command. This fault will normally occur if the operator
quickly exits the manual bias screen.
To Correct: Check the brakes to ensure that they are operating properly.
Check the wiring to the brake coil to ensure that the command
circuit is intact. Check the circuit breaker for the brake circuit to
ensure it has not been tripped.
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