Operation
The following additional parameters appear under Position Encoder Configuration…
as Encoder Type parameter options. These settings are only used for field repair
situations.
• Optical AZ ROC-417 SSI Binary EL ROC-417 SSI Gray
• Optical AZ ROC-417 SSI Gary EL ROC-417 SSI Binary
• Optical AZ/EL ROC-417 SSI Binary
• Optical AZ ROC-226 SSI Gray EL RCN-619 SSI Gray
• Optical AZ RCN-619 SSI Gray EL ROC-226 SSI Gray
There are two ways to set the encoder offsets:
1. Enter the current position of the antenna into the Current position [deg] field.
At installation time the antenna is normally peaked on a target (satellite or
boresight tower) with a known look angle. When the current position is
entered, the offsets are automatically computed.
2. Enter the offsets directly by selecting Offsets [deg] and entering the desired
value. This is normally done only when a firmware upgrade requires re-entry of
parameters, or if the nonvolatile memory should fail.
For systems with two-speed resolver option, refer to Appendix C for procedures to
calibrate the two-speed resolvers.
5.8.6.5 Motion Limits Menu
There are two types of motion limits:
• Software travel limits ("soft limits"): The ACU will not drive the antenna
beyond the soft limits if the option is enabled. The limits function as a
"prelimit", stopping motion of the antenna before it reaches the electrical
travel limit switches. The soft limits should be set such that when the antenna
is moving at its fastest rate and hits the soft limit, it stops just short of
tripping the limit switch.
• Motion errors: The motion errors prevent motion of an axis in the event that
antenna motion as reported by the position encoders does not correspond with
predicted motion due to ACU motor commands.
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