Aux Positioner Lecture Notes

5.3 Coordinate transducers alignment
Positioner coordinate transducers alignment is carried out on a working position
in the following sequence:
- connect control system to the positioner;
- switch on CS and to set the manual operating mode;
- serially setting value 16384 on ALU front panel for each coordinate, put coordi-
nate axes in the given position;
- check if this position of axes is correct ( elevation and azimuth equal to zero)
by means of geodetic devices;
- in case of a deviation of axes position from zero to set coordinates in zero po-
sition by means of the manual control unit without changing values on ALU switches;
- attain a zero mismatch on the PA indicator by means of a worm gear of the cor-
responding coord inate transducer.
5.4 Maintenance service of the positioner.
Maintenance of positioner mechanical systems is carried out in the place of in-
stallation by the maintenance personnel supervising the work of the setup and ac-
quainted with the specifications on the structure and operation.
In connection with design features of the positioner, repeatedly-short-term oper-
ating mode of its executive mechanisms and conditions of operation, the maintenance
service providing it normal functioning is carried out as preventive actions. These ac-
tions include testing of absence of external mechanical damages, presence of greasing
on open surfaces of executive and regulating devices' transmissions.
It is necessary to control the presence of consistent greasing on surfaces of a
screw gear 15 and 16 of elevation drive, guide 1, slider 5 (see Positioner description,
Fig. 3). Presence of consistent greasing in closed bearing units according to conditions
of delivery provides their normal functioning during all term of operation if conditions of
operation are observed.
It is necessary in one year of operation to replace greasing of tooth gearings of
the first and second step of a reducer. In so doing complete disassembly and washing
of gears are conducted. Tighten bolt and screw connections.
AP control system maintenance is not required.
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