Simrad SP90 - REV E, Installation Manual

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Introduction
11
851-164510 / Rev.E
1.7 General installation requirements
Responsibility and approval
The Simrad SP90’s Hull Unit sleeve has been approved by Det
Norske Veritas (DNV) Classification society. Individual Hull
Unit installations must be approved on a case-by-case basis with
regard to the vessel’s national registry and corresponding
maritime authority. The shipowner and shipyard performing the
installation are responsible for obtaining installation approval.
Supply power
The supply voltage to the equipment is to be kept within
±
10%
of the installation’s nominal voltage. Maximum transient
voltage variations on the main switchboard’s bus-bars are not to
exceed -15% to +20% of the nominal voltage (except under
fault conditions).
Simrad recommends that the SP90 sonar is powered using an
Uninterruptible Power Supply (UPS). The UPS should have the
capacity to independently maintain power to the sonar for a
minimum of 10 minutes. This ensures that the system can be
switched off in a controlled manner in the event of a power
failure.
Environmental requirements
All equipment, unless otherwise specified, must be protected
from temperature extremes and excessive humidity.
Compass deviation
Once the installation is complete, the vessel must be swung with
the sonar in both the operative and inoperative modes. The
shipowner and captain are responsible for updating the deviation
table accordingly with regard to the vessel’s national registry
and corresponding maritime authority.
Noise sources
The vessel’s hull, rudder(s) and propeller(s) should be
thoroughly inspected in dry dock prior to installation.
Roughness below the water-line deformities in the shell plating
and protruding obstacles can create underwater noise. These
sources of turbulence must be smoothed or removed as best as
possible. It is especially important that the propeller(s) is not
pitted or damaged.