7200 TROUBLESHOOTING
E - 7
5.2 Resolver Readouts Erratic with Antenna Motion
If the resolver readouts become erratic with antenna motion, (i.e., the readout
functions properly through a certain angular range, but begins to flicker and roll,
large jumps occur, etc), a bad connection is usually the cause. This occurs
because a small signal is being coupled into the very high impedance input of the
RDC, causing the system to behave erratically.
5.3 Resolver Readouts not Changing with Antenna Motion
When the resolver readouts do not change when the ACU commands the antenna
to move, an axis immobile error will occur (unless Motion limits are disabled).
Refer to paragraph 6.1 for further troubleshooting procedures.
5.4 Resolver Readouts Varying Rapidly or Resolver Jumping by
Large Increments
If the resolver readouts are varying rapidly (spinning), or if the resolver is jumping
by large increments, determine if the problem is in the ACU or the resolver
(+cable) by following these steps:
1. Connect a spare resolver to ACU, if available.
2. If there is another resolver of the same type in the system, (e.g., if there is a
problem with azimuth resolver, the azimuth and elevation resolvers are of the
same type), disable motion errors, and switch the resolver cables at the back
of the ACU. Manually run the antenna and see if motion is apparent.
a. If motion is detected, the problem is in the ACU. If a spare RDC card is
available, change it out with the old one. If the problem still exists, contact
VertexRSI.
b. If no motion is detected, buzz out cable. If the cable is good, replace the
resolver. Check for water in the resolvers.
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