Telegraph

Quality in Command

| P.O.Box 23 8600 AA Sneek-Holland | [email protected] www.kwantcontrols.com | Telephone +31 (0)515 413745 | Telefax +31 (0)515 422478 Kwant Controls B.V.

Quality in Command

Telegraph System “Pointer” type CONTENTS Page 1.

GENERAL 1.1 Principles 1.2 Operation

2 3

2. START UP PROCEDURE 2.1 Installation 2.2 Starting operation

3 3

3. TROUBLE SHOOTING 3.1 System status 3.2 Potentiometer failure 3.3 Line up failure

4 4 4

4. MAINTENANCE

4

5. REPEAT ORDERS

5

6. ELECTRICAL COMPONENTS

APPENDIX: DRAWINGS 4A0098152 Principle diagram pointer tel. system 1 4A0098153 Principle diagram pointer tel. system 2 4A0098154 Principle diagram pointer tel. system 3


Quality in Command

Telegraph System “Pointer” type 1. GENERAL 1.1 Principles The pointer telegraph is a communication system designed to send orders from the bridge or bridge annexes to the engine room or engine control room. Whenever a new command is being issued, the telegraph alarm will be switched on. In order to mute the alarm, thecommand must be acknowledged at the selected position by moving the control lever to theposition requested. Precision potentiometers are used to transmit the orders. They are controlled by means of an operating lever equipped with either a knob or a cross lever. Servo motors are used for moving the pointers along the scales of the control units. The system can be switched from telegraph mode to Remote Control (R.C.) mode by means of a single contact. In R.C. mode, the telegraph alarm section is disabled. The wheelhouse unit’s reply pointer is now connected to it’s own command lever. The R.C. mode is used to control the main engine directly from the wheelhouse by means of optional R.C. transmitters. Other possible options are: - Acoustic alarm: bells, buzzers, horns; - Electrical shaft systems; - Pneumatic valves; - Code switches; - Wrong way contacts; - Special potentiometers (e.g. for R.C. or order recorder); - Signal transmitters (e.g. 4-20mA).


Drawing 1; (4A0098152) shows the basic principle of the pointer telegraph system. Both transmitter potentiometers are connected to the amplier inputs A and B, and to the receiver motor units of the other position. With both command levers in the same position, there will be no voltage at output C and the alarm will be off. When either command lever is moved, output C will be driven high and the alarm will sound. The amplier’s deadband is adjustable by means of a trimpotentiometer. However, the factory setting should be adequate. Drawing 2; (4A0098153) the basic diagram has been extended with an extra operating position and R.C. selection. Relay K2 selects which position is on service, relay K1 selects either R.C. or telegraph mode. Drawing 3; (4A0098154) shows how the receiver motor units of E.C.R. and E.R. are driven by the wheelhouse transmitter potentiometer.

1.2 Operation A new command is issued by simply moving the command lever of the wheelhouse (or annexe) to the desired position. The telegraph alarm will sound. At the selected operating position the command must be acknowledged by moving the command lever to the position indicated by the reply pointer, which will mute the alarm. The reply pointer in the wheelhouse will indicate the position of the command lever in E.C.R. or E.R. Position selection and switching to R.C. mode (if required) is done by means of single contact as shown in gure 2 ( 4A0098153).

2. START UP PROCEDURE 2.1 Installation · The wiring of all units should be undamaged during mechanical installation. · Make sure all operating levers can move freely over their full range. · All instruments must be connected according to the relevant wiring diagram. · Measure the power supply voltage. It must correspond to the system design. · Connect the power supply to the system. Make sure the polarity is correct! · Check whether the installation’s fuse corresponds to the maximum current consumed.

2.2 Starting operation When the installation has been completed, the telegraph system can be put into operation.


3. TROUBLE SHOOTING 3.1 Blown fuse 1. wiring connection wrong or short circuit 2. fuse rating wrong 3.2 Pointer movement errors 1. pointer moves in wrong direction: transmitter potentiometer terminals 4 and 5 have been swapped. 2. pointer stuck at scale end: wiper wire has been swapped with one of the others, this may cause the potentiometer to blow! 3. pointer vibrates: one or more terminals 3,4,5 or 6 not connected. 4. pointer does not move at all: defective motor unit due to excessive voltage. 3.3 Alarm failure 1. Power not connected 2. Defective relay K3 on alarm PCB 98033 3. Bell clapper stuck to housing or defective bell. 4. Continuous alarm in full ahead or full astern position: end stops not adjusted properly.

4. MAINTENANCE Most components are accessible through the bottom side of the control unit, except for the dial illumination parts, which can be accessed after removing the protective cover from the top side of the unit. Always make sure that the power is switched off before dismantling any system part. 4.1 Replacement of motor unit When a receiver motor unit has been replaced, it should be adjusted as follows: 1. Loosen the screws that secure the sprocket to the shaft; 2. Set all command levers to the zero position; 3. Switch on the power supply; 4. Set the pointer to the zero position and fasten the sprocket screws tightly.


4.2 Replacement of potentiometer When a transmitter potentiometer has been replaced, it should be adjusted as follows: 1. Set the command lever to the zero position; 2. Measure the potentiometer’s wiper voltage, while rotating the potentiometer shaft until half the power supply voltage is measured; 3. Fasten the sprocket to the shaft and check whether the corresponding receiver pointer also indicates the zero position. The pointer telegraph system does not require any regular maintenance.

5. REPEAT ORDERS Always use the relevant wiring diagram and part number of the component. For parts numbered in the diagram, please indicate that number and the specication as shown on the con cerning part. Always include the Kwant Controls factory number as written on the front page of this manual in all correspondence.


Telegraph

Recommend Documents