C102965-0 Page 1 of 11

02.04.2008

© The information contained in this document is the sole property of Steerprop Ltd. any reproduction or disclosure in part or whole without written permission is prohibited.

DOC-1017-1

Steerprop Control

Unit and Control

Functions

Service Manual

Revision history:

REV. DATE MODIFIER DESCRIPTION

0 2.4.2008

AaNi Created

A

B

C

D

E

F

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© The information contained in this document is the sole property of Steerprop Ltd. any reproduction or disclosure in part or whole without written permission is prohibited.

DOC-1017-1

1

STEERPROP CONTROL UNIT AND CONTROL FUNCTIONS ................................................... 3

2

CONTROL SYSTEM FAULT FINDING ............................................................................................ 4

2.1

C

ONTROL SYSTEM FAILURE ALARM

................................................................................................. 4

2.2

C

ONTROL SYSTEM ALARM TEST

....................................................................................................... 4

3

REFERENCE VOLTAGE SOURCE AP01 ADJUSTING................................................................. 6

4

PROPELLER MOTOR RPM ADJUSTING ....................................................................................... 7

4.1

P

ROPELLER MOTOR RPM SETTING AT MAIN CONTROL

..................................................................... 7

4.2

RPM

CONTROL FAILURE AT MAIN CONTROL

................................................................................... 7

5

VDR INTERFACE AND OTHER RS422 CONNECTIONS ............................................................. 8

5.1

S

ETTING OF THE UNIT

....................................................................................................................... 8

5.2

U

NIT DESCRIPTION AND CONNECTIONS

............................................................................................ 9

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DOC-1017-1

1 S

TEERPROP CONTROL UNIT AND CONTROL FUNCTIONS

The Steerprop control unit includes logic unit A1 (PLC) for main control and signal
converters to interface other controls. There are relays and electronic modules for
back-up controls. Also the control unit includes voltage supply protection and
conversion units.

‰

Follow-up steering and propeller rpm control

‰

Non-follow-up steering

‰

Propeller motor back-up rpm control

‰

Local-remote control selection

‰

Control voltage on/off selection

‰

Control voltage distribution and protection for Steerprop propulsor

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DOC-1017-1

2 C

ONTROL SYSTEM FAULT FINDING

Here are not presented the same faults and instructions as with alarm system. The
presented error and failure situations are based on FMEA analysis of the system and
also from service feedback. There is following common possibilities for control system
failure, which should always check and repair:

‰

Wire is broken, or connection is not good

‰

Short circuit or wire insulation broken

‰

There is no voltage supply present

b

N

OTE

‰

If the circuit breaker or switch is open, find out the reason. If the breaker or
switch is opened by means, check, if you can close it or not.

‰

If the reason is failure, find the real reason and repair it before closing the
circuit breaker.

‰

If the signals have disturbances or noise or level fluctuation, there is
conducting or radiating disturbances from other systems.

‰

These can be corrected in the most of cases by checking and repairing of
the connection of cable screen or pair shield connections specially at
connection points.

‰

Some times helps to move the control cable further away from disturbance
source or power cable.

2.1 C

ONTROL SYSTEM FAILURE ALARM

Control system failure alarm is a failure detected by the internal monitoring system or
total failure of the controller.

If the control unit (PLC) is working, so there is also indication lamp HI17 blinking and
possible other indication lamps giving more accurate information about the failure. If
the indication lamp is not lit, the failure is in PLC.

FAULT EFFECT

TEMPORARY

ACTION

CAUSE REMEDY

PLC failure

See PLC

PLC voltage
supply

See Voltage supply

PLC battery
should be

changed

See PLC

10 VDC
reference supply
AP01

See AP01

Control system failure
alarm

Transmitter
failure

See transmitter

2.2 C

ONTROL SYSTEM ALARM TEST

‰

Select local control by selection switch SC01

‰

Disconnect the connector XP01 on transmitter unit on propulsor.

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DOC-1017-1

‰

The control system alarm will appear.

‰

Connect the connector XP01.

‰

The control system alarm will disappear.

‰

Select remote control by selection switch SC01

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DOC-1017-1

3 R

EFERENCE VOLTAGE SOURCE

AP01

ADJUSTING

The reference voltage source AP01 supplies the voltage
reference for set value potentiometers. The voltage is

adjustable. The max. value is 10.0 VDC. The voltage should
be adjusted 9.95 to 10.00 V.

Adjusting of the voltage:

‰

Select local control (at SCU unit) with switch SC01

‰

Connect the supply voltage (at SCU unit) with switch
SS01

‰

Check the voltage between terminals 228 and 229 with
digital multi meter

‰

Adjust the voltage to 9.95…10.00 volt with small screw
driver

‰

Lock the adjusting screw with lacquer

‰

Then adjust control lever potentiometers

The reference systems based on this voltage supply will

always change, if you change the voltage level of this supply
unit. This means, that all command and feedback

potentiometers should check and verify and maybe adjust,
after the supply adjustment.

FAULT EFFECT

TEMPORARY

ACTION

CAUSE

REMEDY

Reference supply is
loose

Close switchboard
switch

Wire is broken,
short circuit or
connection is open

Tighten and check
that the security
bail is properly set

10 VDC reference
supply AP01 failure,
The green LED at AP01
module is not lit,
Indication lamp HI17
and other indicating
lamps are blinking

without clear reason.
Normally then the

control station indication
lamps are blinking, but

there can be several
other indication lamps
blinking.

The set signals
from the control
levers are
missing or they
are erroneous.

Transfer the
propulsor to back-
up control.

Reference supply is

broken

Replace the

converter

C102965-0 Page 7 of 11

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DOC-1017-1

4 P

ROPELLER MOTOR RPM ADJUSTING

See control lever setting. The control should be adjusted before starting this
adjustment.

4.1 P

ROPELLER MOTOR RPM SETTING AT MAIN CONTROL

All adjustments are set through the logics A1. AC02 is signal isolator.

4.2 RPM

CONTROL FAILURE AT MAIN CONTROL

FAULT EFFECT

TEMPORARY

ACTION

CAUSE

REMEDY

Control lever

potentiometer is
loose or broken

Tighten, change

or adjust the
potentiometer

PLC I/O is not
working properly

Tighten, repair or
change PLC I/O
module

RPM control is not

working properly,
RPM control is

working properly from
another control

station

Propeller motor

rpm control is not
working properly

Transfer control to

another control
station

Wiring or
connection failure

Check and repair
the cabling, wiring

or connector

Signal converter
AC02 is broken at
control unit SCU

Replace and
adjust the signal
converter AC02

PLC I/O is not
working properly

Tighten, repair or
change PLC I/O
module

RPM control is not
working properly,
RPM control is not
working properly from
another control

station. There is also
a “Control System

Alarm”.

Propeller motor
rpm control is not
working properly

Transfer control to
back-up control

Wiring or

connection failure

Check and repair

the cabling, wiring
or connector

C102965-0 Page 8 of 11

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© The information contained in this document is the sole property of Steerprop Ltd. any reproduction or disclosure in part or whole without written permission is prohibited.

DOC-1017-1

5 VDR

I

NTERFACE AND OTHER

RS422

CONNECTIONS

Those settings are described at circuit diagram.

Steerprop control system uses in long distance

control system interfaces serial transmission
according V.11 / RS422 standard. The interface

is balanced, uses a four-wire format and it is
relatively immune to interference. In this system
can the master be always active. The system
can always have two-ways communication.

5.1 S

ETTING OF THE UNIT

‰

Opening the device

‰

Disconnect voltage supply by SS01

‰

Using a screwdriver, disengage the top part of the housing on both sides
carefully. Now you can pull out the top part of the housing and electronics
section about 3 cm.

‰

Changing the configuration acc circuit drawing.

‰

Setting of the required input range by means of DIP switch DIP1, and the
output range be means of DIP switch DIP2 as indicated in the relevant table
inside of the module.

‰

Close the unit

‰

Put the unit back

‰

Connect the voltage supply by SS01

C102965-0 Page 9 of 11

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DOC-1017-1

5.2 U

NIT DESCRIPTION AND CONNECTIONS

The serial interface unit convert the RS-232

interface signals bi-directionally to the RS-422
The module parts are

‰

Voltage supply (1)

‰

Data indication LEDs (2)

‰

RS232 connector (3)

‰

RS422 terminals (4)

PLUG CONNECTOR POWER SUPPLY

‰

Connect 24 V AC/DC ± 20 % via the
COMBICON plug connector (PIN 1 and
3). Operational availability is signaled via
the VCC LED

THE RS-232 INTERFACE

Make a 1-to-1 connection between the PSM

module and the peripheral device as shown.
For a minimum configuration, you need to

connect TXD, RXD and GND (software
handshake)! Connect the 9-pos. SUB-D plug

to the module.

DATA INDICATOR

Two diagnostic LEDs indicate the RS-232
interface modes

‰

Yellow: Transmit data (TD), dynamic

‰

Green: Receive data (RD), dynamic

C102965-0 Page 10 of 11

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DOC-1017-1

CONFIGURATION
For configuration, release the top of the housing on

both sides. Pull the p.c.b. out of the housing as far as
possible.

DTE/DCE SWITCHOVER

The DTE/DCE slide switches can be used to cross
the cables TXD and RXD as well as RTS and CTS

internally so that an adaptation to DTE or DCE
interfaces can be performed easily. If the connected

interface type is unknown, you can determine the
right configuration by trial and error (DTE/DCE

switch).

CTS/RTS SUPPORT (DIP SWITCH 5)

In normal operating mode, no control lines
(RTS/CTS) are required for data direction switching
(switch position DIP 5 "OFF"). The data direction
switching can alternatively be controlled through the
RTS/CTS lines. Set the DIP switch 5 to the "ON"

position.

RTS/CTS INVERSION (DIP SWITCH 6)

In uncommon applications, the control lines must be
inverted. Set the DIP switch 6 to the "ON" position

(default: "OFF").

OPERATION AS RS 422 INTERFACE

Settings:

‰

Set the DIP switch 8 to position. "ON" to activate
the RS-422 operating mode.

‰

Set as described in the section "RS-232

interface" the interface type of the RS-232
interface with the DTE/DCE switchover switch.

In this operating mode, no control lines from the
RS-232 interface are required and none are

transmitted.

‰

Switch the line terminating resistor on both sides

of the RS422 transmission link on. Þ Put
"Terminate" slide switch to "ON".

To couple two RS-422 interfaces, connect the
connections acc. picture (1 = twisted pair) When
connecting the device, take into account that it is
necessary to cross transmitted and received data.
GND connection is recommended, but is not
essential.

C102965-0 Page 11 of 11

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DOC-1017-1

SET THE LINE TERMINATING RESISTOR

RS-422 is the standard for a point-to-point

connection between two devices. The line
terminating resistor on both sides of the RS-422

transmission link must be switched on. Þ "Terminate"
slide switch always in "ON" position.