Procedure, Field Replacement, PCU Kit, 6003A/6004, 2406 & 4003A

Procedure, Field Replacement, PCU Kit, 6003A/6004, 2406 & 4003A1. Brief Summary:Troubleshooting document for diagnosing a fault with and replacing the PCU assembly on the 6003A/6004, 2406 &4003A series antennas.2. Checklist:Verify InitializationN0 ParameterPedestal ErrorTest Motor3. Theory of Operation:The PCU motherboard calculates the movement of the vessel based on the feedback from sensors in the level cage anddirectional changes from the vessels gyro compass. The PCU uses this data to drive the motor of the relevant axis to anequal and opposite amount of movement to the vessel to maintain stabilization. Along with stability, the PCU alsocontrols the antenna dishscan pattern.All tracking, targeting, pointing and polarization commands are sent from the DAC to the PCU. These commands arebased on the vessel’s GPS location, targeting calculations or operator inputs. The PCU software configures the functionof the pedestal and is calibrated by the N0 parameter. This sets the motor gains for each axis and the dishscan patternbased on the size of the antenna. These settings are all stored as “Remote Parameters”.Should the PCU flag a pedestal error, further diagnostics will need to be completed to identify which axis the error islocated in and also the component(s) which are faulty. This document will run through decoding the pedestal error, thenfurther troubleshooting the relevant axis to diagnose which component(s) are defective.4. Verify Initialization:Power cycle the pedestal.1. Level cage drives to its end stop then drives to 45 degrees.2. Elevation axis drives to 45 degrees based on the level cage.3. Cross level axis drives to level based on the level cages horizon reference.4. Limited azimuth axis systems drive clockwise into the azimuth end stop, at 630 degrees of relative.5. Unlimited azimuth axis systems drive clockwise until the home flag and sensor align.If the ACU reports model "xx03" or “xx06”, the PCU’s N0 parameter needs calibrating. Refer to the calibrating the PCUN0 Parameter section of this document. Failures to complete any of the initialization steps, or a pedestal error, requirefurther troubleshooting.Page 1 of 8Document No135300 Rev BCopyright © Sea Tel, Inc 2011 - The information contained in this document is proprietary to SeaTel, Inc.. This document may not be reproduced or distributed in any form without prior writtenconsent of Sea Tel, Inc.