Uninterruptible power supply (UPS) requirements
It is important to ensure continuous operation of the SU90 system independent of any varying quality of the vessel's mains supply. The use of uninterruptible power supplies (UPS) is therefore required.
Uninterruptible power supply units are not included in the standard SU90 system delivery. These items must be purchased locally. Several commercial types are available.
Note
Make sure that the Uninterruptible Power Supply (UPS) does not generate switching noise in the same frequency band as the SU90 system.
To choose the best power solution for your installation, consider environmental conditions, the physical space available, the availability and duration of the batteries, and the power requirements of the SU90 system.
Two UPS systems are required.
1 One UPS system is required to supply the Processor Unit and the display.
2 One UPS system is required to supply the Transceiver Unit.
A single UPS system is sufficient if the power capacity is provided and long cable runs are avoided.
The minimum requirements for the uninterruptible power supply (UPS) are:
•  Input voltage: The input voltage must fit vessel supply voltage.
•  Output voltage: 230 VAC, 50 Hz
•  Output power
–  Processor Unit + Display: 1000 W
–  Transceiver Unit: 1500 W
•  Output form: The output AC voltage must be a sine wave.