Simrad SP270 Manuale di Installazione Scaricare il pdf (Pagina 76)

Simrad SP270

851-160572 / B

Course gyro woth 3-phase stepper output

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

following data:

Stepper data Specifications Legal values

Output voltage 20 to 220 Vac

Ref. polarity +REF or --REF

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 the reference polarity can be measured by a

voltmeter in the following way:

a Connect the positive probe from the voltmeter to the

stepper reference output, and the negative probe to one

of the three signal phases which have a signal output.

Note that one or two signal phases always should have

a signal output voltage.

b Fill the highest measured output voltage value into the

table above.

c When reading the signal output voltage, note the

voltage polarity. If it is positive, the reference polarity

is positive (+ REF), and if it is negative, the reference

polarity is negative (- REF). Fill the result into the table

above.

d If the gyro output is specified to 6 step/degree, this is

equal to a gear ratio of 1:360. If the gear ratio of the

gyro output is unknown, this has to be tried out later

when testing the readout from the gyro on the Sonar

Control Unit. In such case, set the gear ratio to 1:360.

e Note that for some stepper type gyros, the output

voltage is only half-wave rectified. This has to be

checked by an oscilloscope and ticked off below

- Full-wave rectified.

- Half-wave rectified.

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

that each of the three phases S1, S2, S3 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.

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Simrad SP270 Manuale di Installazione Pagina 76