The navigation device NU-20
Purpose and construction
NU_20 - Control Panel
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The navigation device NU-20 has the function of keeping the navigation, the measurement of static diving depth, measure the distance from the sea bottom, detection of underwater obstructions in the horizontal and vertical direction, involvement, control and protection circuits power and signalization of water penetration into the magnetic sensor housing (cylinder) of NU-20.
NU-20 circuits:- Intelligent Gyro Compass (IGC)
- Intelligent fiber optic gyro (IFG)
- Vertical and horizontal sonar
- Static depth gauge - manometer
- 5 "TFT LCD NAVIGATION display
- 5 "TFT LCD SONAR display
- RUN, the power and relay circuit board
- NUR, interface and control circuit board
- CPU, computer circuit board
- The wireless communication unit with antenna (WLETH)
- GPS (outdoor unit)
- Switching control circuits .
Control and Management
Elements of control and management of device NU-20 are located on the front panel and consist of several switches, optical encoders and LED indicators.
Functions of the switches are as follows:- Device turn on/off
- Control of the SONAR
- Management of the:
- display(and size) of maps and navigation (compass)
- chronometer (watch for navigation)
- cursor navigation and sonar (day, night, normal display)
- illumination map view
- service mode
LED indicators show the battery input voltage health, dc/dc converters output voltages, and a water leak in the NU-20 cylinder and in the IGC device. The leak in the cylinder is controlled by water penetration sensor, that is located at the lowest point of the cylinder.
PKB drive-control device
Purpose and construction
PKB - Control Panel
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PKB is an underwater vehicle power monitoring & propulsion control device. The device allows continuous battery monitoring, monitoring of individual branches, and even individual battery cells (Ag - Zn). It is designed to control Ag - Zn (Silver - Zinc) and Pb (Lead) batteries. The device is housed in a waterproof aluminum cylinder. Control device circuits (control & signalization) are located inside the cylinder with front mounted management handles, measurement instruments and control lamps (LED). Some of the PKB device elements are located in the area of the battery pack (voltage control connectors, temperature probes, hydrogen probe), and some of them in the switching board area (ampere-hour measurement unit, contactors auxiliary contacts). Two underwater reflectors are supplied from the PKB cylinder.
PKB device circuits :- Propulsion preparation and management elements
- Voltmeter
- Amper-hour meter
- Thermometer
- Electromotor timer
- Hydrogen meter
- Ag-Zn batteries
- Battery health indicator
- Flooding indicator
- Underwater reflectors switches
- The electromagnetic clutch
- DC/DC converter