JRC JMA-7122-6XA, Installation Manual

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JMA-9100/7100 Installation Manual > 2.INSTALLATION OF SCANNER UNIT > 2.4 PRECAUTIONS
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2) Installation procedures
a.
Maintain a flat level surface on which to install the scanner.
•
Use sufficiently thick steel material and reinforcement material for the scanner's
installation surface (mount base) to reduce vibration and impact. Keep the mount base
flat and smooth.
•
If there is a partial gap between the mount base and the scanner chassis's legs, work on
the installation surface so that it becomes flat and smooth, or make adjustments by
inserting metal shims. If a gap exists and the scanner is tightly clamped, the chassis will
distort and become damaged by vibration.
b.
Avoid using vibration-proof rubber and resin
•
Do not insert an elastic body, such as vibration-proof rubber or resin, between the mount
base and the scanner chassis' legs. If rubber or resin is inserted, the amplitude of
vibration increases, resulting in the possibility of damage to the scanner. Furthermore,
if installation bolts become loose due to deterioration of rubber or resin, the scanner
may be damaged or fall from its mount.
3) Installation and clamping method
a. Installation direction
•
Installation should be done so that the cable gland is oriented toward the stern.
b.
Bolts, nuts and tightening torque to be used
•
Use stainless steel bolts for the scanner and uniformly tighten all of the bolts using
double nuts for each bolt so that the scanner will not become loose (Table 2-4).
•
Although the length of the bolt will differ according to the thickness of the mount base,
use a bolt long enough so that more than 4 millimeters of thread protrudes beyond the
double nuts after the double nuts have been tightened.
c. Use of washer and corrosion-resistant measures
•
At the location where a bolt's head or nut comes in contact with the scanner chassis' legs
and the mount base, insert a plain washer which fits the bolt; and, at the location where
the nut comes in contact with the plain washer, insert a spring washer, and then securely
tighten the nuts (Fig 2-14).
•
To prevent corrosion due to the contacts between different metals, such as the scanner
chassis' legs, installation surface, bolts, nuts, etc., cover the bolt's head and nuts with
sealant (Fig 2-14).
Table2-4
：
Length of scanner mounting bolts and tightening torque
Thickness of Mount
Base(mm) Bolt Torque(N-m)
S-band 19
M12
×
65(mm) SUS304
65
X-band 12
M10
×
55(mm) SUS304
40