Maximum Velocity Watchdog Algorithm

RCP8 performs the following checks on the velocity to ensure that the antenna operates within the safe limits:

• A velocity request limiter clamps any out-of-bounds velocity requests from the host computer or indirectly from the position servo at the maximum value.
• A continuous check on the antenna velocity determines that it operates within safe limits.

The checks are controlled with the following setup parameters:

• Maximum Absolute Velocity - 80 Tach units
• Velocity Shutdown Safe Margin - 5 Tach units
• Velocity Shutdown Time Check - 1 second

The watchdog forces an antenna shutdown if the velocity exceeds the Maximum Absolute Velocity, by more than the Velocity Shutdown Safe Margin margin, during a time period longer than that of the Velocity Shutdown Time Check check.

The following example shows the lower elevation limits for a typical system. Upper elevation limits are analogous.