Simrad SP270 Manual de Instalação descarregar pdf (Página 72)

Simrad SP270

851-160572 / B

Course gyro with 3 -phase synchro output

1 First, get the specifications of the gyro to fill in the

following data:

Synchro data Specifications Legal values

Output voltage 20 to 220 Vac

Frequency 50 / 60 / 400 Hz

Gear ratio 1:360 / 1:180 / 1:90 / 1:36

If it is difficult to find the specifications for the gyro, the output

voltage and frequency can be measured in the following way:

a The output voltage can be measured by an AC

voltmeter or by an oscilloscope on the reference output

R1 & R2. Note that if an oscilloscope is used, the

reference probe on the oscilloscope must not be

connected to the mains ground, and the measured peak

to peak value of the output voltage must be divided by

2√2 to get the RMS voltage.

b Fill the output voltage value into the table above.

c The frequency can be measured by an oscilloscope on

the reference output R1 & R2. Note that the reference

probe on the oscilloscope must not be connected to the

mains ground. Calculate the frequency 1/T (T is the

time for one sine wave) and fill the result into the table

above.

d If the gear ratio of the gyro output also is unknown, this

has to be tried out later when testing the readout of the

gyro on the Sonar Control Unit. In such case, set the

gear ratio to 1:360.

When connecting the gyro cable to the 15 pin D-connector, note

that each of the three phases S1, S2, S3 and the reference R1 has

three different connection pins, marked L (Low), M (Medium)

and H (High). These pins are used for different gyro output

voltage values as indicated for the connections below.

Signal phase 1: S1-L (20-70V) pin 2

S1-M(80-140V) pin 9

S1-H (150-220V) pin 1

Signal phase 2: S2-L (20-70V) pin 11

S2-M(80-140V) pin 3

S2-H (150-220V) pin 10

Signal phase 3: S3-L (20-70V) pin 5

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Simrad SP270 Manual de Instalação Página 72