7200 TROUBLESHOOTING
E - 14
Tracking signal input saturated (Applies to: All systems)
Description: This fault occurs when the signal received from the tracking
receiver reaches 10 VDC. This fault is a latching fault and will not
clear without user intervention.
To Correct: On a clear day (no clouds in antenna direction), peak the antenna
on the target and then set the "0 dB" point at 8.0 VDC.
On systems with TRL tracking receivers, this can be done by
adjusting the input attenuation level found under the tracking signal
parameter menu for a specific target. On systems with TRC/TRK
tracking receivers, this can be done by adjusting the level
adjustment on the front of the tracking receiver.
6.1 Axis Immobile
If an Axis immobile error is displayed on the ACU, check for the following
conditions:
1. Setting of Immobile/reversed tolerance [deg] parameter is too high -- reset
parameter.
2. Tracking speed potentiometer at drive cabinet is set too low -- reset the
tracking speed.
3. Insufficient start torque (low elevation angles)--boost starting torque in the
inverter.
4. Encoders are decoupled from the antenna -- reconnect the encoders.
5. Encoders are miswired -- check the wiring on the encoders.
6. The drive cabinet interface cable has failed -- check the cable and replace if
necessary.
7. Failure at I/O board -- the ACU cannot successfully command the drive
cabinet. Check and/or replace the board.
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