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8.
8
.
CARE AND
MAINTENANCE
The V System requires but a minimum of care for trouble-free performance. A few sug
gestions are given in the following paragraphs.
8
.1.
PER
IO
DIC
CLEAN IN
G
Long, trouble-free service can be enhanced by following a routine maintenance schedule.
The Daily, Weekly, and Monthly cleaning activities listed beloware appropriate for an
"Average" vibration laboratory. If the environment where the V System is located. is
cleaner than "average", the periods can be lengthened. If the environment is dirty, the
periods should be shortened .
With the 4805 Exciter Body and with the Exciter Heads, cleaning problems are limited to
the obvious cleaning of accessible surfaces. The 4801 Body, however, requires more
particular care, as follows:
Daily:
Each day, before starting, inspect the Field Supply Air Inlet Screen. Remove
paper and debris bot h from the screen and from the area immediately around
the screen.
Weekly:
Brush off the Field Supply Air Inlet Screen with a soft brush.
Monthly:
(1) Blow or brush any accumulated dirt out of the Rotation Bearing/Brake As
sembly.
(2) Vacuum clean the upper surface of the Field Coils. The Exciter Head may be
removed but the iron Upper Wheel should be left in place.
(3) Vacuum clean the Field Supply Air Inlet Screen.
If in the monthly inspection and cleaning any severe accumulation is noticed, a thorough
cleaning of the region in isopropyl alcohol is recommended. The Field Coils present a
speci
al
problem and are discussed further in section
8 .2
.3.
8.2. CARE OF EXCITER BODY 4801
8.2.1. Exciter Body Cover
If an Exciter Body is to be left for more than a few minutes without an Exciter
Head
mounted in place, a cover should be placed over the Exciter Body. Although the flat top
surface of the Exciter Body looks like a convenient table, it is very dangerous to leave it
uncovered, since small objects may fall into the Exciter Body. Loose objects in the Exciter
Body may cause distortion on the acceleration waveform, may short out a Field Coil or
the Driver Coil, or may jam the Head/Field Cooling Fan. Iron particles are particularly
dangerous, since they tend to
col
lect in the magnetic air gap where they rub on the
Driver Coil and eventually destroy the coil.
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