Kongsberg Simrad SN90, Installation Manual

Page: 34 / 298

32
381298/C
Installation requirements
Topics
Supply power requirements, page 32
Uninterruptible Power Supply (UPS) requirements, page 32
Cables and wiring requirements, page 33
Compass deviation requirements, page 33
Noise sources, page 34
Dry docking requirements, page 34
Requirement for classification approval, page 34
Supply power requirements
Observe the general requirements related to the supply power.
The supply voltage to the SN90 must 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).
Uninterruptible Power Supply (UPS) requirements
Observe these requirements related to the Uninterruptible Power Supply (UPS).
It is important to ensure continuous operation of the SN90 independent of varying
quality of the vessel's mains supply. The use of uninterruptible power supplies is
therefore required.
Uninterruptible power supply units are not included in the standard SN90 delivery.
These items must be purchased locally.
Several commercial types are available. To choose the best power solution for your
SN90 installation, consider environmental conditions, space available, the availability
and duration of the batteries, and the power requirements of the SN90.
Two systems are required:
1 One power system is required to power the Processor Unit and the display.
2 One power system is required to power the Transceiver Unit.
Simrad SN90