ETS-Lindgren 2090 Controller - Manual (Page 63)

Model 2090 Multi-Device Controller
POLARIZATION VIOLATION AND LIMITS
A common source of confusion is the Polarization Limits
Violation ( E006 ) ) designed to protect antenna elements
from damage. The 2090 allows the user or a program to set
separate limits for horizontal and vertical polarizations.
However, attempting to polarize the tower when the current
position is outside the limits for the target polarization will
generate a polarization violation. (The 2090 provides a
small overshoot tolerance on this value, so a current
position of 99.5 will not cause an error when switching to a
polarization where the limit is 100.0.) Previously, there
was no way to solve a polarization violation from the front
panel other than to move the tower carrier and try to
polarize again. The 2090 now supports a limit toggle
option that allows the user to inspect and adjust the limit
for the other polarization. While viewing either the upper
or lower limit (by pressing the UP or DOWN buttons under
LIMIT), pressing the POLARIZATION key will toggle the
display to show the corresponding limit for the other
polarization without changing the tower polarization. To
indicate that the displayed value and polarization is not the
current polarization, the indicator light by the
POLARIZATION key will flash on and off. While in this
state, the limit can be changed using the limit edit keys just
the same as any other parameter. In order to toggle the
polarization of the tower from the front panel, the display
must be showing the current position, and not either limit.
CHANGING SPEEDS
©ETS-Lindgren, April 2006 63
Revision G– P#399199