Field Service Procedure – Replacement Pol Motor Kit, USAT
Page 4 of 7
Document No
136481 Rev A
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Tel, Inc. This document may not be reproduced or distributed in any form without prior written
consent of Sea Tel, Inc.
7.
Test the Pol Motor Drive:
Pol motor drive can be verified by introducing an error into the system which the pol motor will have to
counteract. Remove the radome top and unbolt the pedestal from its mounting point, now if you rock the
antenna from side to side the pol motor will drive the feed assembly to counteract the motion being exerted on
the system.
If it is suspected there is a dead spot in the motor power down the system and gently rotate the axis by moving
the belt backwards and forwards. This in turn will rotate the motor pulley and shaft and it should be apparent if
there is a dead spot as the rotation will feel taught at that position.
*Caution:
Be extremely careful rotating the pedestal around while your fingers are in this
area to prevent pinching or crushing your fingers in the pedestal assembly.
8.
Measure the Motor Voltage:
If no drive is present verify if the pol motor is receiving the 24VDC from the PCU. Power down the pedestal by
switching off the DAC then disconnect the reflector harness from the pol motor connector and re initialize the
pedestal (a pedestal error will be displayed as the pol axis can’t initialize).
Once initialized you should be able to measure 24VDC should be present between pin 3 and ground (pin 5 or
the harness back shell) and pin 8 and ground (pin 5 or the harness back shell). If the voltage is present and the
motor isn’t driving the motor is defective and needs to be replaced, if the voltage is not present then the PCU
isn’t outputting the voltage and is defective.
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