Marine gyro compass: common fault judgment and disposal guide

Troubleshooting - Hardware Self Test - ETO Specific Protocols

I. The main compass power indicator does not light up

Potential causes and troubleshooting points:

1. Abnormal main power supply status:
Mains power (external connection board) to which the terminal is connected: AC 100/200V ± 10% or less; 50/60 Hz ± 5% or less.

2. Ship's power distribution switch tripped:
Verify the connecting cables between the main switch on the ship's switchboard and the external connection board and the main switch itself.

3. Roving power unit (power adapter failure):
Check whether the power supply unit cable connection is normal, and use a meter to check whether the input and output voltages of the power supply unit are in accordance with the specification.

4. The power indicator is damaged:
The power indicator is faulty or damaged.

II. Rapid rotation of the main compass navigational dials

Potential Causes: Failure of the follower system, check the input signal and output signal of the follower amplifier.

When the follower system of the marine gyrocompass fails, the staff needs to check the input signal and output signal of the follower amplifier immediately. The specific checking steps are as follows:

First: Staff should carefully check the input of the follower amplifier to see if the input signal is stable and meets the requirements for normal operation.
Secondly: The staff also needs to check the output of the follower amplifier to ensure that the output signal is accurate and that there are no abnormal fluctuations or distortions.
Finally: By examining both the input and output signals of the follower amplifier, the staff can more accurately find the cause of the follower system malfunction, and then take the appropriate repair approach.

III. Inconsistency between the main compass and the sailing scale of the synchronized sending box

Potential Causes: Synchronization system malfunction, replace synchronization amplifier.

When the failure of the synchronization system leads to abnormal operation of the whole system, the staff should replace the synchronization amplifier in order to restore the normal operation of the system. The synchronization amplifier is a key component of the following system, and its performance directly affects the stability and efficiency of the system. Replacing the synchronization amplifier with a new one can effectively improve the synchronization performance of the system and guarantee the stable operation of the system.

The replacement procedure is as follows:

The crew first disconnects the connection between the main rosette and the synchronized sending box to ensure that the system is in a safe condition before proceeding with the replacement operation.
The staff checked the installation location of the synchronization amplifier, prepared the dismantling tools and followed the instructions in the equipment manual strictly to dismantle the old synchronization amplifier step by step.
Before installing a new synchro amplifier, staff need to check that its model and specifications are the same as the old equipment to ensure compatibility.
The crew properly installed the new synchronization amplifier in place and reconnected the wiring between the main rosette and the synchronization sender box to ensure a strong and reliable connection.
Staff started the system and performed a functional test to confirm that the new synchro amplifier was working properly and that the main rosette was aligned with the sailing scale of the synchro transmitter box.

Fourth, the rosary cannot be stabilized for a long time

Potential Causes: Gyrosphere failure (check that the current is within the normal values given in the manufacturer's manual or check the roto-mechanical drive mechanism).

The first step in the gyrosphere troubleshooting process is for the technician to check the current value to determine if it is within the standard range provided by the manufacturer. This step is critical because abnormal fluctuations in current are usually the direct cause of gyrosphere failure. If the current value is outside or below the specified range, the technician should immediately adjust or replace the relevant components. In addition, technicians also need to conduct a comprehensive inspection of the mechanical transmission mechanism of the compass. This is because once the mechanical transmission mechanism becomes loose, worn or stuck, it will cause the gyro ball to run poorly, which will then lead to failure. Therefore, meticulous inspection and timely maintenance are the key links to ensure the normal operation of the gyroball.

The specific steps are as follows:

(1) The operator should first ensure that the equipment is disconnected from the power supply for his own safety.

(2) Using a special current detection tool, the operator connects it to the operating circuit of the gyrosphere. After reconnecting the power supply, observe and record the values displayed by the current detection tool. Next, compare the recorded value with the standard range provided by the manufacturer to determine whether the current value is normal. If the current value is abnormal, there may be a malfunction within the gyrosphere, which would require further disassembly for inspection or contacting the manufacturer for repair. If the current value is normal, the operator needs to consider other possible causes of the malfunction, such as problems with the mechanical transmission mechanism.

Gyrocompass Common Troubleshooting Checklist

(for ETO field rapid diagnosis and documentation)

fault phenomenon	Core checks/operational points	Status Record
Power light does not turn on	Check distribution board AC 100/200V (±10%) and frequency (±5%).	□ Normal / □ Deviation
Power light does not turn on	Measure the power adapter output voltage for compliance with specifications	□ Normal / □ Abnormal
turn the dial fast	Check that the signal at the input of the follower amplifier is stable	□ Normal / □ Abnormal
The scale is inconsistent.	Synchronization amplifier performance evaluation (perform replacement steps if necessary)	□ Replaced / □ To be repaired
long term instability	Measure and check gyroball current (compare to manufacturer's manual)	Value: ______ A
long term instability	Check the mechanical transmission mechanism for looseness, wear and tear, or jamming.	□ Normal / □ Maintenance

Warning:Prior to current measurement and internal inspection, always ensure that the power is disconnected for personal safety!

Gyrocompass Maintenance and Fault Determination Assessment Paper

Name: __________ Position: __________ Score: __________

I. Multiple Choice and Fill in the Blanks (15 points each)

1. When the main Luo Jing power indicator does not light up, the main power voltage should be checked first. The standard AC voltage range should be 100/200V AC. ±_______% Inside.

2. Rapid rotation of the main compass navigational scale, usually due to _______ caused by a malfunction in the system.

3. When replacing the synchronizing amplifier, the first operation must be:____________________________________。

II. Explanatory Judgment Questions (20 points each)

4. Scene:A ship's roto would not stabilize for a long time after startup. eto Using an ammeter, the gyroball current was measured to be much higher than the manufacturer's manual nominal value.

Question:What does this tell us? What should happen next?