B. Controls: AC Equipment - Electrical steering system
Four (4) AC-AC motor controllers to position and regulate the azimuth motors
Four (4) AC brake resistors
Two(2) Brake control units

C. Controls
Bridge forward and bridge aft main steering stations in the wheelhouse, each including:
Two (2) drop-in panels for each steering station
- Speed and direction control levers
- Indicator units for azimuth position and propeller RPM
- Devices for hardwired azimuth and prime mover speed back-up controls (main station only)
- Control station selection devices. DP/manual switch not included

Two (2) steerprop control units in the machinery space, including:
- Programmable logic controller for the main control for azimuth and prime mover RPM
- Control voltage and local control switches
- Independent back-up controls for azimuth and prime mover RPM
- AC/DC converter for 24 V DC control system with auto-switchover to
back-up 24 V DC supply with circuit breakers and filters
- Prime mover speed control with 4-20mA or equal with interlocks
- Control system alarm contacts to be incorporated with alarm system
- Autopilot interface
- DP interface

Two (2) local control at the propulsor:
- Azimuth push-button controls, mechanical indicator for azimuth position

D. Miscellaneous Items
Three (3) sets of instruction and maintenance manuals
Two (2) sets of classification certificates - A.B.S
One (1) set of tools
Ten (10) days of service technician's time for installation inspection, 
start-up and attendance at sea trails

Technical Data
E. Performance
1. Power capacity
Propeller diameter of steerprop SP35 : 2,800 mm
Nozzle type : HJ3-5
Input speed : 1,040 rpm
Throughout power : 2,529 kw
Propeller shaft speed : 239 rpm
Azimuth capacity
Azimuth speed, nominal : 2.0 rpm

2. Dimensions and weights
Stem length : 3,350 mm
Weight of basic steerprop SP35 : 28,000 kg (approximate)
Azimuth propulsor
Weight of the auxiliaries : 1,000 kg (approximate)

3. Interface data
Fluid volumes :
Volume of lubricant : 2,100 liters
Seal fluid : 20 liters
Cooling water - lubrication, t<38C : 250 l/min
(fresh water)

4. Control voltage supply
Control voltage main supply 120 VAC
Control system (90 - 264 V) : 150...240 W

5. Control voltage battery supply 24 V DC
Starting battery is not acceptable for this supply
Control voltage supply : 240 W
Indication system : 10 W
Back-up control : 240 W

Electric Power requirement, 3ph, 480 VAC or equal
Steering gear motor 1 : 22 kw
Steering gear motor 2 : 22 kw
Lubrication/hydraulic pump : 10 kw

Note: Power requirements for steering motors and hydraulic are per steerprop unit.

Steerprop control system does not include circuit breakers and isolation switches for
AC current systems. They are normally located at the vessels switchboard.

Steerprop recommendation is to arrange the power supply redundant. Each 
drive can be supplied from separate switchboards arranged so that if one supply 
goes down another is able to continue.The ship generator should be selected suitable 
for frequency converter type motor controller load. Also other system design should 
take care of frequency converter load.

F. Bow tunnel thruster units fixed pitch propeller, reversing motor
Two (2) Berg propulsion BFTT 419, each including
- Four bladed, fixed pitch type NiAl - bronze propeller dia 1950mm
- One primary input coupling for connection to prime mover
- One tunnel, appx. length 1400mm with stainless steel in way of the propeller
- One static header tank for lubrication
- Classification ABS

G. Thruster control system for two (2) Berg fixed pitch Thrusters
The system will control the motor speed and direction by supplying an
analogue demand signal to the motor controller.

The system will consist of two (2) control panels (one forward and one aft) and
two (2) thruster control units.

Each panel will have the following features:
One (1) twin lever control head type Lilaas
Indication for station in control in command
Indication for thruster running
Station tranfer/between fore and aft station
Start button/indication
Stop button/indication
Connection for DP system
ABS classification

Control will consist of follwing elements:
Control transfer logic elements and indication outputs
Stop/start elements
Signal output to the motor controller
Speed signal 4-20mA full port / 12mA full stbd.
Power supply conditioning
DP connection
terminal strip connectors