Kobelt 7173-K User manual

8238-129th Street, Surrey, B.C. Canada V3W 0A6
Telephone [phone] Fax [phone]
http://www.kobelt.com
7173-K MANUAL
February 2012

Revised April 2009
MODEL 7173-K INSTRUCTION MANUAL
CONTENTS
1. MODEL 7173-K ELECTRONIC FFU STEERING SYSTEM
2. MODEL 7173-K COMPONENTS
3. MOUNTING THE 7173-K AMPLIFIER UNIT
4. MOUNTING THE FFU CONTROLLER UNITS
5. MOUNTING THE MODEL 7174 RUDDER FEEDBACK UNIT
6. WIRING THE SYSTEM
7. TESTING THE SYSTEM
8. TROUBLESHOOTING
9. PERIODIC INSPECTION
DRAWINGS
7173-001 - SINGLE SPEED STEERING SYSTEM WIRING DIAGRAM
7173-002 - DUAL RATE SPEED STEERING SYSTEM WIRING DIAGRAM
7173-003 - SINGLE SPEED CATAMARAN STEERING SYSTEM WIRING
DIAGRAM (ELECTRONIC TIE BAR)
7173-004 - TWO INDEPENDENT SINGLE SPEED STEERING SYSTEM
WIRING DIAGRAM
7173-005 - SINGLE SPEED STEERING SYSTEM BLOCK DIAGRAM
7173-006 - DUAL RATE SPEED STEERING SYSTEM BLOCK DIAGRAM
7173-007 - SINGLE SPEED CATAMARAN STEERING SYSTEM BLOCK
DIAGRAM
7173-008 - TWO INDEPENDENT SINGLE SPEED STEERING SYSTEM
BLOCK DIAGRAM
7173-009 - SINGLE STEERING SYSTEM WITH OPTIONAL JOG LEVER
CONNECTION DIAGRAM
7173-010 - SINGLE STEERING SYSTEM WITH OPTIONAL AUTO PILOT
CONNECTION DIAGRAM
A-400899 - 7174 FEEDBACK UNIT SWITCHES WIRING DIAGRAM

SELECTING AND INSTALLING
ELECTRONIC REMOTE STEERING CONTROL
When a full follow-up remote electronic control becomes integrated with either a
manual steering system (helm pump) or a jog lever, the full follow-up control must
be de-energized before putting the manual steering devices or jog levers into
service.
If the full follow-up control system is not turned off when maneuvering with other
methods, the steering will remain in the position as requested by the full follow-up
system. For example, if a 2-speed steering system is installed whereby the full
follow-up system would receive a smaller volume and the jog lever, via a separate
solenoid, would receive a bigger volume of oil, the steering system would follow
the jog lever until it is released. Then the follow-up control would put the rudder
back to its original position.
We, however, highly recommend having a switch installed on the pump starting
panel capable of turning off the 7173 and associated components. If more than one
full follow-up control unit is used in a given system, a station transfer system is
required since the 7173 can only use a command from any one station at any one
time. Feeding two separate signals into the electronic control system would
obviously create problems. If an autopilot is installed aboard a vessel, all full
follow-up signals should be coordinated via a station transfer system. In other
words, the autopilot must be considered as an extra station (but wired directly to
the solenoid). If a vessel is equipped with two full follow-up electronic control
stations and one autopilot, it is recommended to install a 3-station transfer system:
two stations for the full follow-up and one for the autopilot and, of course, a switch
as indicated on our electronic drawings alongside the electric breaker which is
supplied by the shipyard. The switch also becomes shipyard supply and should be
incorporated into the pump control panel for the hydraulic pumping unit.

Electronic Full Follow-up
Amplifier Model 7173-K
This unit is designed to accept the command
signal from our Models 7165, 7166, 7167,
7169, 7171, 7172 and 7176 and co-ordinates
the desired rudder position with our feedback
unit Models 7168 and 7174. Models 7144,
7145 and 7148 are equipped with solenoid
valves and can be activated by the Model
7173-K to disperse hydraulic fluid to the
hydraulic steering system to maintain the
desired position.
This device can be located anywhere aboard
ship, even in the steering compartment, since
its watertight and non-corrosive enclosure
material will protect the electronics internally.
The Model 7173-K is a multi-optional driver
board (12- or 24-Volt DC) which can
control:
1. Single steering system
See drawings 7173-001 / 7173-005
2. Dual speed steering system
See drawings 7173-002 / 7173-006
3. Two independent steering systems
controlled by the same controller
(This is ideal for catamaran steering
because of its electronic tie bar)
See drawings 7173-003 / 7173-007
4. Two independent hydraulic systems,
i.e. steering and bucket control
See drawings 7173-004 / 7173-008
It can easily be changed in the field, see
manual.

MODEL 7173-K
All dimensions in inches (mm)
TYPICAL MULTIPLE STATION ARRANGEMENT

MODEL 7173-K ELECTRONIC FULL FOLLOW-UP STEERING SYSTEM
The KOBELT 7173-K System consists of the following components:
1. Electronic FFU Amplifier
2. Controller (Wheel Controller, FFU Lever or Joystick)
3. Follow-up (Rudder Feedback) Unit
4. Solenoid Interface Valve
The Model 7173-K System is used to set the position (or the angle) to which the Rudder goes.
The Amplifier Unit compares the respective command and feedback signals from the Controller
and Follow-Up Unit. If the signals are not equal, the Amplifier Unit applies directional control
to the hydraulic pressure to move the rudder in the appropriate direction. When the Controller
and Follow-Up signals are equal, the Amplifier shuts off directional control and the rudder stops.
Mounting the Model 7173-K Amplifier Unit
The Model 7173-K Amplifier Unit is mounted inside a waterproof housing. The housing should
be mounted in a convenient, easily serviced location. Allow enough space to permit opening of
the housing cover (see Model 7173-K data sheet).
Mounting the FFU Controller Unit
The following types of controllers are available:
Model 7171 Lever Controller
Model 7165 Joystick Controller
Model 7169 Joystick Controller
Model 7176 Walk-about Controller
Model 7167 2-Axis Joystick Controller
Model 7166 Wheel Controller
Model 7172 Wheel Controller
Model 6655 Steering and Engine Control Head
The Models 7166 and 7172 Wheel Controller is normally bulkhead mounted. A steering wheel
should be attached to this type of Controller (see individual data sheet). The Model 7171 FFU
Lever Controller is waterproof and is normally mounted on a flat surface (see Model 7171 data
sheet). The Model 7169 Joystick Controller should also be mounted on a flat surface.

MOUNTING THE MODEL 7174 RUDDER FEEDBACK UNIT
The Model 7174 or 7168 Follow-Up (Rudder Feedback Unit) must be mounted near the steering
gear as shown in the diagram below. The output signals will then be calibrated with the tiller in
place.
IMPORTANT: Hydraulic steering gears using a hydraulic Full Follow-Up System (often
referred to as “Telemotor” or “Accumotor”) must drive the Feedback Unit from the Servo
Cylinder, not the Rudder stock. In such a case, the Model 7174 Follow-Up should be mounted
approximately two feet from the end of the Servo Cylinder. This is done to ensure proper linear
motion. The cable for the Models 7174 or 7168 Feedback Unit should be a 3-conductor
#18-gauge cable.

WIRING THE SYSTEM
All cables should be weatherproof marine type and be free of joints or splices. If it is necessary
to join wires, a proper waterproof junction box should be used.
The input power to the Model 7173-K Amplifier Unit is 11 VDC to 28 VDC. The power cable
(2-conductor, #14-gauge) should be run from the switchboard through a customer-supplied
on/off switch via a circuit breaker or fuse (8 amp).
The cable to the pumpset solenoid/relay should be 3-conductor #16 gauge wire.
A 3-conductor, #18 gauge cable should be used for the Controller. If more than one controller is
used, a “Station Select” switch must be connected between the controller and the Model 7173-K.
The “Station Select” switch is optionally supplied. A mechanical selector switch requires a
single pole, multi-position switch. Consult the factory for electronic station selector systems
(Model 7173-T). The 8 VDC reference supply from the Model 7173-K terminals #9 and #12 or
#13 and #16 is common to all Controllers. Only the output signals coming back from each FFU
Controller are connected to the station selector. From the Station Selector switch, the FFU
Controller output is connected to Model 7173-K terminal #11 or #15.
The Model 7170 NFU Controller can also be connected to the Model 7173-K System (see Model
7170 data sheet). Activating the Model 7170 Jog switch will temporarily override the FFU
System. FFU Control will be returned automatically as soon as the Jog switch is deactivated. If
the rudder moves in the wrong direction, reverse the black and white wires.
NOTE: See Drawing 7173-009 for how to interface a NFU Jog Switch to a FFU System where
the Jog Switch can be used for backup.

TESTING THE SYSTEM
1. Check that the supply voltage is connected to the correct amplifier terminals. The circuit
board has built-in polarity protection to prevent circuit damage, but the system will not
initialize until polarity is correct.
2. Centre the rudder and ensure that the rudder follow-up unit is mechanically centered. Centre
all FFU controllers.
3. Turn on power to the Model 7173-K Amplifier Unit.
4. Turn on the hydraulic pumpset or, in the case of an engine driven pumpset, start the engine.
5. The rudder should stay at midship and may hunt back and forth (see steps #9 and #10) at the
midship position. If the rudder moves to a hardover position, shut off power to the amplifier
and reverse the wires going to the solenoid or the black and white wires coming from the
feedback unit (see applicable drawing) on the Model 7173-K circuit board. Re-apply power
to the Model 7173-K Amplifier Unit.
6. Move the FFU controller to the 20° port. The rudder should move in the port direction. If
the rudder moves to starboard, reverse the black and white wires coming from the controller.
7. Repeat step #6 for any additional controllers wired via a station selector.
8. Move the FFU controller to a hardover position and adjust the internal FFU controller trim
pot until the rudder stops just before the hardover position. Also, rudder limit adjustment
can be achieved by adjusting rudder limit trim pots on 7173-K board or by adjusting the
stroke on the feedback unit. NOTE: You must not allow the cylinder to continually push
against the mechanical stops (hardover position).
9. Move the FFU controller to the centre position and adjust the deadband adjustment trim pot
(R17 or R31) clockwise until the rudder begins to hunt back and forth (rudder may already
be doing this).
10. Carefully adjust the R17 or R31 deadband control counterclockwise until the hunting effect
stops. This setting will be the maximum useable gain for your system. Check the
adjustment several times by moving the controller to various positions. If hunting starts, re-
adjust R17 or R31 counterclockwise to correct.
CAUTION: In order to avoid overheating/damaging the solenoid coils or the 7173-K amplifier,
power to the amplifier should be disconnected if hydraulic power is not available.

TROUBLESHOOTING
SYMPTOM POSSIBLE CAUSE REMEDY
System dead - power off
- fuse blown
- DC power input polarity reversed
- turn on power
- replace fuse
- reverse connection
Erratic operation - follow-up pot of FFU or controller
potentiometer defective
- check follow-up and
controller potentiometer
- meter output voltage,
replace if necessary
Rudder hunts back
and forth
- R17 or R31 deadband control in
Model 7173-K Amplifier incorrectly
adjusted
- reduce gain by turning
counter-clockwise
Rudder goes to a
hardover position
- defective potentiometer
- damaged cable
- sticky solenoid valve or relay
- loose follow-up linkages
- solenoid wires reversed
- feedback wires reversed
- replace
- repair
- repair or replace
- repair
- reverse wires
- reverse wires
Rudder does not travel
same number of
degrees hardover to
hardover
- control potentiometer not centered
- feedback unit or potentiometer not
centered
- meter output voltage or
resistance
- meter output voltage or
resistance
L1 and L2
continuously ON - U1 damaged - replace
L3 and L4
continuously ON - U2 damaged - replace

KOBELT MANUFACTURING COMPANY LTD.
Periodic Inspection Notes
All mechanical and electronic components should be inspected at regular intervals,
once every 6 – 12 months is recommended depending on the operating environment
and frequency of use. Some Kobelt components are equipped with inspection covers
which can be removed for examination of internal parts.
The following serves as a general inspection guideline for Kobelt engine control and
steering control system components. All deficiencies have to be fixed and defective
parts be replaced by a certified technician to ensure a reliable and safe operation.
1. Inspect all mechanical linkages for proper movement and the bolts and nuts are
tight for their functions.
2. Inspect all push / pull cable connections for free movement, adjust if necessary.
3. Check for corrosion and excessive wear at all moving parts that could cause
problem in normal operation.
4. Apply lubricating oil / grease to mechanical parts at all available greasing points.
Make sure that no oil or grease will come into contact with any electronic parts.
For gears and rotating shafts, use of graphite-base grease is recommended.
5. Check for signs of moisture ingress or condensation that could cause short-circuit
or corrosion problem to electrical / electronic components. Surfaces of all
electronic parts should be free from moisture, dust or foreign particles.
6. Check seals and holding screws on housings for damage and tightness.
7. Verify that primary and secondary power sources are at normal values.
8. Inspect system wiring for insulation breakdown, loose connections or potential for
short-circuit failure.
9. Check limit switches and potentiometers for corrosion, smooth operation and
correct positioning. It is recommended that these components be replaced at least
every five years or more frequently when working in hot and humid environment.
10.With the engine stopped, perform functional test for each system – refer to
individual component operating and test procedures.