Installation manual

Introduction

851--160116 / B

Connecting a course gyro with stepper output

j 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:

j 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.

j Fill the highest measured output voltage value into the

table above.

j Whenreadingthesignaloutput voltage,notethevoltage

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.

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

equal to a gear ratioof 1:360. If the gear ratioof thegyro

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.

j Notethat forsome steppertype gyros,the outputvoltage

is only half--wave rectified. This has to be checked by an

oscilloscope and ticked off below

j Full--wave rectified.

j Half--wave rectified.