Tritech Intelligent Gyro Compass, Руководство по эксплуатации продукта, Страница: 36 / 50

Tritech International Ltd Intelligent Gyro Compass
12.0 Basic Fault Finding
12.1 General
This section is intended to help with fault finding down to easily replaceable components (i.e. to PCB
assembly level).
The following are guidelines on how to approach the diagnosis of a fault in the system:
1. Assemble all relevant information on the iGC and any other systems that interface with
the iGC. This might include:
a. Manuals.
b. System drawings (particularly electrical diagrams).
2. Have a good set of diagnostic tools.
3. Start at the general & work towards the particular.
4. Use all the information available. For example:
a. Are any other systems malfunctioning?
b. Are all functions malfunctioning or just one or a few?
c. Are there connections between these faults?
12.2 Fault Symptoms
The following table gives a list of fault symptoms with components to check in order to narrow down
the cause of the likely fault. This should act as a pointer towards which items should be replaced.
Symptom Suggested Action
No output data from iGC.
Check that power is applied. Under normal conditions, the
iGC feels warm to the touch when switched ON – this can
be used as a quick check that power is present.
No power present on pins 1 & 2 of
the interconnecting cable.
Check that the supply is switched on. Check status of
fuses, or output from power supply. Check continuity of
interconnecting cable.
No output data from iGC, but power
is present at the interface
connector.
Check interconnecting cable. Remove cable and check
continuity of wiring and insulation value. More than 50% of
underwater system faults are attributable to cables and
connectors.
No output data from iGC received
by host, but cable checks OK.
Attach a test-cable, Laptop and power supply to the iGC
and check correct operation. If data is OK from iGC,
investigate the host system telemetry interfaces. If no data
from iGC, see below:
No output data from iGC when
tested with test cable and laptop.
Use a terminal programme set to 19,200 n, 8, 1 and check
for configuration output message when the iGC is powered
up. Refer to Section 10 – Commissioning for details of
what to expect. If configuration data looks OK, check host
interface for correct operation / function.
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