11-APR-06 Rev E OMACS3000
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System Screens
Figure 16: Single Speed Pol Hardware Limits Screen
Dual Speed Pol Drive Hardware Limits
If a dual speed (2:1 ratio) pol drive is installed, the operator first moves to the counter-clock wise limit as
directed by the screen. (See
Figure 17
) The operator will jog until that axis reaches the physical limit. The
operator will know that the limit is reached when that direction checkbox is checked. The oper ator should
also notice that the resolver counts (as displayed by the position status line) discontinue count ing down.
When the pol counter-clockwise limit is reached, the screen will display a request for the operator to
manually rotate the pol resolver to read 1.0 degree. The operator or observer must manuall y rotate the pol
resolver on the antenna during initialization setup in order to guarantee that the resolver readings will not
cross zero, which would cause invalid pol angles to be read. The operator verifies that the po l resolver
manual rotation is complete by pressing the completed button.
The operator must jog the pol drive into the clockwise physical limit using the CW jog button on the s creen.
(See Figure 18.) The system software will then compute the center angle and request the operator to jog to
the center angle. The operator verifies that the pol resolver jog to the center angle is complete by pressing
the completed button. The system software will adjust the pol offset so that the center angle rea ds 90.00
degrees.