Simrad ARGUS FMCW 3G, Руководство пользователя

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Basic operation | Argus Radar Operator Manual
•
Gyro No Preset. Means that the connections are detected correctly, but the operator need to
preset the gyro value as described above.
•
Gyro No Ref. Means that no reference is detected for the three phases of the gyro signal. A
check of the phases is required.
•
Gyro Phase Error. Means that the three phases of the gyro signal all have the same voltage.
This is also the failure given when no phase is connected (all at 0 V).
The three phases are given by the Gyro with a 3 bit gray code. The purpose of this code is to
detect the increment of the value and its sign; its most important characteristic is that only
one of the three bits can change at the time and in this application (normally it is not a char-
acteristic of the gray code), the 3 bits cannot all have the same level. Check the gray code to
see the four green LED on the Alpha board are o.k.:
1.
The first one next to red LED is D33 and it indicates the first phase (S1).
2.
The second one is D34 and it is the second phase indicator (S2).
3.
The third one is D35 and it indicates the third phase (S3).
4.
The last one is D36 and it is to indicate the reference.
Move the Gyro or somehow simulate a turn and the three LEDs (S1, S2 and S3) will start to
change their state, it will be easy to observe that they never will be all on or all off, and only
one at a time will change its state.
S1 S2 S3
Gray code
Obviously, to do this test, it is necessary to have an incremental Gyro (i.e. stepper) correctly
connected and set up.
Speed
It indicates the ship speed data from the speed sensor in knots. It also indicates if the value is
entered manually. The speed description label indicates the type of value available, if entered
manually or simulated. The possible speed sensors are indicated in source speed conversion
table next page and below are some examples of possible speed read-outs.
Speed from a single axis speed log, in the
course field the Gyro heading value is replied.
Speed Through Water and Course, in this case
the information is taken from the speed log.
Speed Over Ground and Course Over
Ground, if there is no info between paren-
theses the information is taken from the
speed log (dual axis speed log, Log Ground
Speed selected in Own Ship set menu).
Speed Over Ground and Course Over
Ground, the type of sensor is briefly indicated
between parentheses.